Radiator for power transformer, combined heat dissipation device and power transformer

Abstract

The present invention provides a radiator for a power transformer, a combined heat dissipation device, and a power transformer. The radiator includes a fin group, a fan, an inlet oil pipe, and an outlet oil pipe. The fin group includes a plurality of fins, and each fin includes an inner wall, an outer wall, and a fin cavity, thereby forming a coolant path to enable the hot coolant from the transformer oil tank to transfer the heat carried to the surrounding air by contacting the inner wall and the outer wall of the fin; each fin includes an arc segment, a plurality of fins are sleeved together, and the plurality of fins include an outer-layer fin, an inner-layer fin, and an intermediate fin. The fan is installed on one side of the fin group to form an air path, and the coolant path and the air path are isolated from each other. The heat from the hot coolant transferred through the inner wall and the outer wall of the fin is transferred to the external environment through the air. The radiator of the present invention limits the air volume output of the fan within the radiator, significantly improving the cooling effect.

Description

Technical Field

[0001] The present invention relates to the field of heat dissipation devices, and more particularly, to a radiator for a power transformer, a combined heat dissipation device, and a power transformer. Background Art

[0002] The radiator structure of a traditional transformer is composed of multiple groups of heat sinks combined with a fan. Each heat sink group is composed of multiple heat sinks arranged at equal intervals. Due to the obvious rotational phenomenon of the air outlet of the fan, a large amount of air leakage occurs outside the heat sink group, seriously affecting the cooling effect of the transformer.

[0003] Currently, by arranging multiple heat sink groups in combination, the air volume leaking obliquely between the heat sink groups can be effectively utilized. However, a large amount of air leakage still occurs outside the heat sink group. In addition, by adding a shroud outside the radiator, part of the air leakage can be blocked. However, since the air resistance of the channel formed by the shroud is smaller than the air resistance of the heat sink group, the blocked air will overflow from the top of the shroud and cannot return to the heat sink group for cooling. Summary of the Invention

[0004] In view of this, the present invention aims to provide a radiator for a power transformer that can improve the cooling effect and avoid air leakage.

[0005] According to one aspect of the present invention, there is provided a radiator for a power transformer. The power transformer includes an iron core, a winding surrounding the iron core, and a transformer oil tank for containing a coolant for cooling the iron core and the winding. The transformer oil tank includes an oil outlet for discharging the hot coolant and an oil inlet for introducing the cold coolant. The radiator includes a heat sink group, a fan, an inlet pipe, and an outlet pipe. The inlet pipe is connected to the oil outlet of the transformer oil tank, and the outlet pipe is connected to the oil inlet of the transformer oil tank.

[0006] Wherein, the heat sink group includes a plurality of first heat sinks. Each first heat sink of the plurality of first heat sinks includes an inner wall, an outer wall, a heat sink cavity defined between the inner wall and the outer wall, a heat sink inlet communicating with the heat sink cavity, and a heat sink outlet communicating with the heat sink cavity. The heat sink inlet is connected to the inlet pipe, and the heat sink outlet is connected to the outlet pipe, thereby forming a coolant path from the oil outlet of the transformer oil tank, through the inlet pipe, through the heat sink inlet, through the heat sink cavity, through the heat sink outlet, and reaching the oil inlet of the transformer oil tank, so that the hot coolant from the transformer oil tank transfers the heat carried by contacting the inner wall and the outer wall of the plurality of first heat sinks to the surrounding air.

[0007] Among them, each of the plurality of first heat sinks extends along the axial direction, and the cross-section of each first heat sink perpendicular to the axial direction includes an arc segment, and the inner diameters of the arc segments of each first heat sink are different from each other. The plurality of first heat sinks are sleeved together in a concentric arrangement, and the arc segments of the plurality of first heat sinks are located in the same angular region in the circumferential direction. The plurality of first heat sinks include an outermost layer heat sink, an innermost layer heat sink, and a plurality of intermediate heat sinks located between the outermost layer heat sink and the innermost layer heat sink.

[0008] Among them, the air outlet of the blower is installed on one side of the heat sink group along the axial direction, and the other side of the heat sink group along the axial direction is in communication with the external environment.

[0009] Among them, a first air passage is formed along the axial direction between the outermost layer heat sink, the intermediate heat sinks, and the innermost layer heat sink to form an air path from the air outlet of the blower, through the first air passage to the external environment. The coolant path and the air path are isolated from each other. The heat from the hot coolant transferred through the inner wall and the outer wall of the plurality of first heat sinks is transferred to the external environment through the air flowing through the air path.

[0010] In an exemplary embodiment, one or more of the plurality of intermediate heat sinks have openings therethrough, so that the plurality of first heat sinks are in communication with each other in the radial direction perpendicular to the axial direction, thereby forming a second air passage for air circulation in the radial direction to guide the air flowing on the first air passage along the axial direction to flow in the radial direction.

[0011] In an exemplary embodiment, each of the plurality of intermediate heat sinks has the opening, and the openings of one of the plurality of intermediate heat sinks and the adjacent intermediate heat sinks adjacent to the intermediate heat sink are located in different angular regions in the circumferential direction to guide the air flowing in the region between two adjacent first heat sinks with relatively high temperatures to flow a certain distance in the radial direction and then pass through the corresponding opening and enter the region between two adjacent first heat sinks with relatively low temperatures.

[0012] In an exemplary embodiment, each of the plurality of intermediate heat sinks has at least two openings, and the profile of each of the at least two openings is rectangular parallelepiped-shaped.

[0013] In an exemplary embodiment, when the axial direction of the heat sink group is in the vertical direction, the inlet oil pipe is located at the upper end of the heat sink group, and the outlet oil pipe is located at the lower end of the heat sink group;

[0014] Wherein, a first groove for receiving the inlet oil pipe is formed at the upper end of the heat sink group, and the first groove includes a first recess formed at the upper end of each of the plurality of first heat sinks;

[0015] And wherein, a second groove for receiving the outlet oil pipe is formed at the lower end of the heat sink group, and the second groove includes a second recess formed at the lower end of each of the plurality of first heat sinks.

[0016] In an exemplary embodiment, each of the outer heat sink and the intermediate heat sink is in a hollow cylindrical shape.

[0017] In an exemplary embodiment, the inner heat sink includes a first sheet and a second sheet opposite to each other, the cross section of the first sheet and the cross section of the second sheet are both arc-shaped, and there is a first spaced-apart space and a second spaced-apart space between the first sheet and the second sheet.

[0018] According to another aspect of the present invention, there is provided a combined heat dissipation device, the combined heat dissipation device includes a first radiator module, the first radiator module includes at least one first radiator and at least one second radiator, the first radiator is a radiator for a power transformer according to any one of the above solutions of the present invention, and the second radiator includes a plurality of flat-shaped second heat sinks, and the second heat sinks are stacked together to form a cuboid-shaped radiator.

[0019] In an exemplary embodiment, the at least one first radiator includes two first radiators, the two first radiators and the at least one second radiator are arranged in a row of radiators in series, one of the two first radiators is located at one end of the row of radiators, and the other of the two first radiators is located at the other end of the row of radiators, and the cross section of each first heat sink of each of the two first radiators includes a semi-circular section.

[0020] In an exemplary embodiment, the cross section of each first heat sink of each of the two first radiators further includes straight sections extending from both ends of the semi-circular section.

[0021] In an exemplary embodiment, the at least one second radiator further includes one or more fans mounted on one side of the second fin, and the fans of the second radiator are at the same horizontal height as the fans of the first radiator.

[0022] In an exemplary embodiment, the combined heat dissipation device further includes a second radiator module, the structure of the second radiator module is the same as that of the first radiator module, the first radiator module and the second radiator module are arranged side by side, the first radiator module and the second radiator module share a delivery oil collecting pipe and a discharge oil collecting pipe, the input port of the delivery oil collecting pipe is communicated with the oil outlet of the transformer oil tank, and the output port of the delivery oil collecting pipe is communicated with the inlet pipe of the first radiator and the inlet pipe of the second radiator; the input port of the discharge oil collecting pipe is communicated with the outlet pipe of the first radiator and the outlet pipe of the second radiator, and the output port of the discharge oil collecting pipe is communicated with the oil inlet of the transformer oil tank;

[0023] and the delivery oil collecting pipe is located in the middle position between the first radiator module and the second radiator module; and the discharge oil collecting pipe is located in the middle position between the first radiator module and the second radiator module.

[0024] According to another aspect of the present invention, there is provided a power transformer, which includes an iron core, windings surrounding the iron core, and a transformer oil tank for containing a coolant for cooling the iron core and the windings. The transformer oil tank includes an oil outlet for discharging the hot coolant and an oil inlet for introducing the cold coolant. The power transformer further includes one or more radiators for a power transformer according to any one of the above solutions of the present invention; or the power transformer further includes one or more combined heat dissipation devices according to any one of the above solutions of the present invention.

[0025] Through the radiator for a power transformer, the combined heat dissipation device and the power transformer of the present invention, at least the following beneficial technical effects can be achieved.

[0026] First, in the solution of the present invention, since the cross-section of each first fin perpendicular to the axial direction includes an arc segment, an outer contour of the radiator that is closed in the circumferential direction is formed by the outer fins. Since the air flowing between the layers of the radiator can be well restricted within the outer contour of the radiator that is closed in the circumferential direction, the leakage of the cooling air volume of the radiator for a power transformer can be reduced, making the cooling structure more reasonable.

[0027] Second, in the solution of the present invention, since the middle heat sink has an opening passing through it, which can guide the air flowing in the first air passage along the axial direction to flow in the radial direction, therefore, the present invention can significantly improve the cooling efficiency of the radiator for a power transformer, effectively reduce the temperature rise of the transformer, and thus improve the performance of the transformer.

[0028] Third, the present invention can achieve a high cooling performance of the radiator for a power transformer, can reduce the cooling area of the radiator or the number of fans, thereby saving space and effectively reducing the cost of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The following will, by referring to the accompanying drawings, describe in detail the preferred embodiments of the present invention to make those of ordinary skill in the art more clear about the above and other features and advantages of the present invention. In the drawings:

[0030] Figure 1 is a perspective view of a radiator for a power transformer according to an exemplary embodiment of the present invention.

[0031] Figure 2 is another perspective view of a radiator for a power transformer according to an exemplary embodiment of the present invention.

[0032] Figure 3 is a schematic bottom view of a radiator for a power transformer according to an exemplary embodiment of the present invention.

[0033] Figure 4 is a perspective view of a fin group of a radiator for a power transformer according to an exemplary embodiment of the present invention.

[0034] Figure 5 is another perspective view of a fin group of a radiator for a power transformer according to an exemplary embodiment of the present invention, wherein the outer fins are removed for the purpose of clarity.

[0035] Figure 6 is a perspective view of a combined heat dissipation device according to an exemplary embodiment of the present invention.

[0036] Figure 7 is another perspective view of a combined heat dissipation device according to an exemplary embodiment of the present invention.

[0037] Figure 8 is a schematic front view of a combined heat dissipation device according to an exemplary embodiment of the present invention.

[0038] Figure 9 is a schematic side view of a combined heat dissipation device according to an exemplary embodiment of the present invention.

[0039] Figure 10 It is another perspective view of the combined heat dissipation device according to an exemplary embodiment of the present invention, and this perspective view is observed from above the combined heat dissipation device.

[0040] Figure 11 It is another perspective view of the combined heat dissipation device according to an exemplary embodiment of the present invention, and this perspective view is observed from below the combined heat dissipation device.

[0041] Among them, the reference numerals are as follows:

[0042] 10. Heat sink group

[0043] 100. First radiator

[0044] 101. Outer heat sink

[0045] 102. Intermediate heat sink

[0046] 103. Inner heat sink

[0047] 1031. First sheet

[0048] 1032. Second sheet

[0049] 20. Inlet oil pipe

[0050] 30. Outlet oil pipe [[ID=!]]

[0051] 40. Fan

[0052] 50. Delivery oil collecting pipe

[0053] 60. Discharge oil collecting pipe

[0054] 70. Installation frame

[0055] 80. Support

[0056] 81. Support rib

[0057] 104. Opening

[0058] 105. First recess

[0059] 106. Second recess

[0060] 200. Second radiator [[ID=!]] Detailed implementation manners

[0061] To make the objectives, technical solutions and advantages of the present invention clearer, the following examples are given to further elaborate on the present invention in detail. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. The following description of at least one exemplary embodiment is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form.

[0063] First, please refer to Figure 1 and Figure 2 , which show perspective views of a radiator for a power transformer according to an exemplary embodiment of the present invention from different angles. The power transformer is not shown in Figure 1 and Figure 2 . It is well known that a power transformer includes an iron core, windings surrounding the iron core, and a transformer oil tank for containing a coolant for cooling the iron core and windings. The transformer oil tank includes an oil outlet for discharging the hot coolant and an oil inlet for introducing the cold coolant. The radiator of the present invention can be arranged in the surrounding space of the power transformer as needed, such as above or on the side.

[0064] Referring to Figure 1 , the radiator includes a fin group 10, a fan 40, an inlet pipe 20, and an outlet pipe 30. The inlet pipe 20 is used to communicate with the oil outlet of the transformer oil tank to receive the hot coolant from the transformer oil tank, and the outlet pipe 30 is used to communicate with the oil inlet of the transformer oil tank to convey the cooled cold coolant back to the transformer oil tank, thereby forming a coolant circulation loop. When the axial direction of the fin group 10 is in the vertical direction, the inlet pipe 20 is located at the upper end of the fin group 10, and the outlet pipe 30 is located at the lower end of the fin group 10.

[0065] Referring to Figure 2, the heat sink group 10 includes: a plurality of first heat sinks, each of the plurality of first heat sinks includes an inner wall, an outer wall, a heat sink cavity (not shown in the figure) defined between the inner wall and the outer wall, a heat sink inlet (not shown in the figure) communicating with the heat sink cavity, and a heat sink outlet (not shown in the figure) communicating with the heat sink cavity. The heat sink inlet is communicated with the oil inlet pipe 20, and the heat sink outlet is communicated with the oil outlet pipe 30, thereby forming a coolant path from the oil outlet of the transformer oil tank, through the oil inlet pipe 20, through the heat sink inlet, through the heat sink cavity, through the heat sink outlet and to the oil inlet of the transformer oil tank, so that the hot coolant from the transformer oil tank transfers the heat carried by contacting the inner wall and the outer wall of the plurality of first heat sinks to the surrounding air. Although the structures of the heat sink cavity, the heat sink inlet and the heat sink outlet of each heat sink are not shown in the drawings, those skilled in the art can easily understand and implement the specific structure of each heat sink.

[0066] Referring to Figure 2 , each of the plurality of first heat sinks extends along the axial direction (i.e., Figure 2 the vertical direction in Figure 2 the example), and the cross-section of each first heat sink perpendicular to the axial direction includes an arc segment (specifically a circle in the Figure 2 example), and the inner diameters of the arc segments of each first heat sink are different from each other. The plurality of first heat sinks are sleeved together in a concentric arrangement with each other, and the arc segments of the plurality of first heat sinks are located in the same angular region in the circumferential direction. The plurality of first heat sinks include an outermost outer heat sink 101, an innermost inner heat sink 103, and a plurality of intermediate heat sinks 102 located between the outer heat sink 101 and the inner heat sink 103. The plurality of first heat sinks may have the same length in the axial direction. Since the cross-section of each first heat sink perpendicular to the axial direction includes an arc segment, the outer contour of the radiator closed in the circumferential direction is formed by the outer heat sink 101. Since the air flowing between the first heat sinks of the heat sink group 10 can be well restricted within the outer contour of the radiator closed in the circumferential direction, the leakage of the cooling air volume of the radiator for the power transformer can be reduced, making the cooling structure more reasonable.

[0067] Referring to Figure 2, the air outlet of the blower 40 is installed on one side of the heat sink group 10 along the axial direction, and the other side of the heat sink group 10 along the axial direction communicates with the external environment. A first air passage is formed between the outer heat sink 101, the middle heat sink 102, and the inner heat sink 103 along the axial direction to form an air path from the air outlet of the blower 40, through the first air passage to the external environment. The coolant path and the air path are isolated from each other. The heat from the hot coolant transferred through the inner and outer walls of the multiple first heat sinks is transferred to the external environment through the air flowing through the air path. When the axial direction is in the vertical direction, the blower 40 is located at a lower position of the heat sink group 10. In addition, in Figure 3 the structure of the blower 40 is clearly shown.

[0068] Referring to Figure 4 and Figure 5 , one or more of the multiple middle heat sinks 102 (preferably each middle heat sink) includes an opening 104 passing through it, and the opening forms an air duct so that the multiple first heat sinks are communicated with each other in the radial direction perpendicular to the axial direction, thereby forming a second air passage for air circulation in the radial direction to guide the air flowing on the first air passage along the axial direction to flow in the radial direction.

[0069] Referring to Figure 4 and Figure 5 , each of the multiple middle heat sinks 102 has an opening 104. The openings of one middle heat sink among the multiple middle heat sinks 102 and the openings of the adjacent middle heat sinks adjacent to this middle heat sink are located in different angular regions in the circumferential direction to guide the air flowing in the region between two adjacent first heat sinks with relatively high temperatures to flow a certain distance in the radial direction and then pass through the corresponding opening 104 and enter the region between two adjacent first heat sinks with relatively low temperatures. In other words, through this arrangement, the opening of this middle heat sink is not directly facing the opening of the adjacent middle heat sink. Thus, the air from the opening of this middle heat sink cannot directly flow into the opening of the adjacent middle heat sink, that is, the openings of each layer of heat sinks are staggered to avoid direct penetration.

[0070] Referring to Figure 4 and Figure 5, each of the plurality of intermediate fins 102 includes at least two openings 104, and the at least two openings 104 may be evenly distributed along the circumferential direction of the intermediate fin; and the profile of each of the at least two openings 104 may be rectangular parallelepiped-shaped. Specifically, each of the plurality of intermediate fins 102 has two openings that are circumferentially spaced 180 degrees apart. Of course, each of the plurality of intermediate fins 102 may include more than three openings, and these openings may be equally spaced.

[0071] In Figure 5 , it is clearly shown that the shape of each opening 104 is rectangular parallelepiped-shaped and is substantially located at the middle position of each intermediate fin 102 in the axial direction. The extension length of the opening 104 in the axial direction may be one-half to three-fourths of the length of the intermediate fin 102 in the axial direction, for example, two-thirds. Of course, it can be understood that the shape and size of each opening can be adaptively adjusted according to specific circumstances. For example, the outer contour of the opening may be elliptical or the like. In addition, the distribution of the openings on each of the intermediate fins 102 can also be appropriately adjusted.

[0072] Referring to Figure 4 and Figure 5 , a first groove for receiving the inlet pipe 20 is formed at the upper end of the fin group 10. The first groove includes a first recess 105 formed at the upper end of each of the plurality of first fins; and a second groove for receiving the outlet pipe 30 is formed at the lower end of the fin group 10. The second groove includes a second recess 106 formed at the lower end of each of the plurality of first fins (refer to Figure 5 ).

[0073] Referring to Figure 2 and Figure 4 , each of the outer fins 101 and the intermediate fins 102 is in the shape of a hollow cylinder. Referring to Figure 4 , the inner fin 103 includes a first piece 1031 and a second piece 1032 that face each other. The cross-sections of the first piece 1031 and the second piece 1032 are both circular arcs, and there is a first spaced space and a second spaced space between the first piece 1031 and the second piece 1032.

[0074] Referring to Figures 6 to 11, which shows a combined heat dissipation device according to an exemplary embodiment of the present invention from multiple angles. The combined heat dissipation device includes a first radiator module and a second radiator module, and the structure of the second radiator module may be substantially the same as that of the first radiator module. The first radiator module and the second radiator module are arranged side by side, and the first radiator module and the second radiator module share a conveying oil collecting pipe 50 and a discharging oil collecting pipe 60.

[0075] Referring to Figure 10 , the input port of the conveying oil collecting pipe 50 is used to communicate with the oil outlet of the transformer tank, and the output port of the conveying oil collecting pipe 50 is used to communicate with the inlet oil pipe 20 of the first radiator and the inlet oil pipe of the second radiator.

[0076] Referring to Figure 11 , the input port of the discharging oil collecting pipe 60 is used to communicate with the outlet oil pipe 30 of the first radiator and the outlet oil pipe of the second radiator, and the output port of the discharging oil collecting pipe 60 is used to communicate with the inlet oil port of the transformer tank. The conveying oil collecting pipe 50 is located in the middle position between the first radiator module and the second radiator module; and the discharging oil collecting pipe 60 is located in the middle position between the first radiator module and the second radiator module.

[0077] Since the structure of the second radiator module is substantially the same as that of the first radiator module, hereinafter, the structure of the first radiator module will be mainly described. Of course, it can be understood that the structure of the second radiator module may also be different from that of the first radiator module.

[0078] The first radiator module includes at least one first radiator 100 and at least one second radiator 200. The first radiator 100 is similar to the radiator Figures 1 to 5 described, but there are differences, which will be elaborated hereinafter and can also be clearly seen from the drawings. The second radiator 200 includes a plurality of flat-shaped second heat dissipation fins, and the plurality of flat-shaped second heat dissipation fins can be arranged at equal intervals and stacked together to form a cuboid-shaped radiator.

[0079] Referring to Figure 6 , at least one first radiator 100 may specifically include two first radiators 100, and the two first radiators 100 and a plurality of second radiators 200 are arranged in a row of radiators successively. Referring to Figure 7 , one of the two first radiators 100 is located at one end of the row of radiators, and the other of the two first radiators 100 is located at the other end of the row of radiators. The cross-section of each heat dissipation fin of each first radiator among the two first radiators 100 includes a semi-circular section. In addition, referring to Figure 6It can be seen that the cross-section of each fin of each of the two first radiators 100 may further include straight sections extending from both ends of the semi-circular section, and the lengths of these two straight sections in the axial direction of the conveying header pipe 50 are approximately half of the length of a single second radiator 200 in the axial direction of the conveying header pipe 50. That is to say, each fin of each of the two first radiators 100 includes both a half hollow cylindrical part and a flat plate shaped part. Of course, in different embodiments, according to different requirements, the shape of the first radiator 100 may only include a half hollow cylindrical part, or may include the entire hollow cylindrical part, that is, including Figures 1 to 5 the first radiator as shown in

[0080] Referring to Figure 7 , the plurality of second radiators 200 further include a blower installed on one side of the plurality of flat plate shaped fins, and the blower of the second radiator 200 is at the same horizontal height as the blower 40 of the first radiator 100.

[0081] Referring to Figure 9 , there is one or more supports 80 between the conveying header pipe 50 and the discharge header pipe 60, for example, two supports ( Figure 9 only one support can be seen at the angle in Figure 9 ), and the support may specifically be a support pipe or other suitable form. In addition, in order to strengthen the supporting effect, support ribs 81 may be arranged on the side of the support 80, and the support ribs may be triangular support ribs ( Figure 6 seen as a vertical bar at the angle in

[0082] The present invention also provides a power transformer, which includes an iron core, windings around the iron core, and a transformer oil tank for accommodating a coolant for cooling the iron core and the windings. The transformer oil tank includes an oil outlet for discharging the hot coolant and an oil inlet for introducing the cold coolant, and the power transformer includes the radiator described with reference to Figures 1 to 5 , and / or includes the combined heat dissipation device described with reference to Figures 6 to 11 . The radiator and / or the combined heat dissipation device may be arranged around the transformer.

[0083] By using the improved radiator or the combined heat dissipation device of the present invention, the air volume output of the blower can be limited within the radiator for effective cooling, so the cooling effect can be significantly improved.

[0084] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A radiator for a power transformer, the power transformer comprising a core, windings surrounding the core, and a transformer oil tank for containing a coolant for cooling the core and the windings, the transformer oil tank including an oil outlet for discharging hot coolant and an oil inlet for introducing cold coolant, It is characterized in that The radiator includes a fin group (10), a fan (40), an inlet pipe (20), and an outlet pipe (30). The inlet pipe (20) is in communication with the oil outlet of the transformer oil tank, and the outlet pipe (30) is in communication with the oil inlet of the transformer oil tank, wherein the fin group (10) includes a plurality of first fins. Each of the plurality of first fins includes an inner wall, an outer wall, a fin cavity defined between the inner wall and the outer wall, a fin inlet communicating with the fin cavity, and a fin outlet communicating with the fin cavity. The fin inlet is in communication with the inlet pipe (20), and the fin outlet is in communication with the outlet pipe (30), thereby forming a coolant path from the oil outlet of the transformer oil tank, through the inlet pipe (20), through the fin inlet, through the fin cavity, through the fin outlet, and to the oil inlet of the transformer oil tank, so that the hot coolant from the transformer oil tank transfers the heat carried by contacting the inner wall and the outer wall of the plurality of first fins to the surrounding air; wherein each of the plurality of first fins extends along an axial direction, and a cross-section of each of the plurality of first fins perpendicular to the axial direction includes an arc segment, and inner diameters of the arc segments of each of the plurality of first fins are different from each other. The plurality of first fins are sleeved together in a concentric arrangement, and the arc segments of the plurality of first fins are located in the same angular region in the circumferential direction. The plurality of first fins include an outermost outer fin (101), an innermost inner fin (103), and a plurality of intermediate fins (102) located between the outer fin (101) and the inner fin (103), wherein an air outlet of the fan (40) is installed on one side of the fin group (10) along the axial direction, and the other side of the fin group (10) along the axial direction is in communication with the external environment; wherein a first air passage is formed along the axial direction between the outer fin (101), the intermediate fins (102), and the inner fin (103) to form an air path from the air outlet of the fan (40), through the first air passage to the external environment. The coolant path and the air path are isolated from each other. The heat from the hot coolant transferred through the inner wall and the outer wall of the plurality of first fins is transferred to the external environment through the air flowing through the air path; One or more of the plurality of intermediate heat sinks (102) have an opening (104) therethrough such that the plurality of first heat sinks are in communication with each other in a radial direction perpendicular to the axial direction, thereby forming a second air passage for air flow in the radial direction to direct air flowing on the first air passage along the axial direction to flow in the radial direction.

2. The radiator for a power transformer according to claim 1, characterized in that, Each of the plurality of intermediate heat sinks (102) has the opening (104), and the opening of one of the plurality of intermediate heat sinks (102) and the opening of an adjacent intermediate heat sink adjacent to the intermediate heat sink are located in different angular regions in the circumferential direction to direct air flowing in a region between two adjacent first heat sinks having a relatively high temperature to flow a certain distance in the radial direction and then pass through the corresponding opening (104) and enter a region between two adjacent first heat sinks having a relatively low temperature.

3. The radiator for a power transformer according to claim 2, characterized in that, Each of the plurality of intermediate heat sinks (102) has at least two openings (104), and the profile of each of the at least two openings (104) is rectangular parallelepiped-shaped.

4. The radiator for a power transformer according to claim 3, characterized in that, When the axial direction of the heat sink group (10) is in the vertical direction, the inlet oil pipe (20) is located at the upper end of the heat sink group (10), and the outlet oil pipe (30) is located at the lower end of the heat sink group (10); Wherein, a first groove for receiving the inlet oil pipe (20) is formed at the upper end of the heat sink group (10), and the first groove includes a first recess (105) formed at the upper end of each of the plurality of first heat sinks; And wherein, a second groove for receiving the outlet oil pipe (30) is formed at the lower end of the heat sink group (10), and the second groove includes a second recess (106) formed at the lower end of each of the plurality of first heat sinks.

5. The radiator for a power transformer according to any one of claims 1 to 4, characterized in that, Each of the outer heat sink (101) and the intermediate heat sink (102) is in a hollow cylindrical shape.

6. The radiator for a power transformer according to claim 5, characterized in that, The inner heat sink (103) includes a first sheet (1031) and a second sheet (1032) opposite to each other, the cross-section of the first sheet (1031) and the cross-section of the second sheet (1032) are both arc-shaped, and there is a first spaced space and a second spaced space between the first sheet (1031) and the second sheet (1032).

7. A combined heat dissipation device, characterized in that, The combined heat dissipation device includes a first radiator module, the first radiator module includes at least one first radiator (100) and at least one second radiator (200), the first radiator (100) is a radiator for a power transformer according to any one of claims 1 to 4, and the second radiator (200) includes a plurality of flat-shaped second heat sinks, and the second heat sinks are stacked together to form a radiator in a cuboid form.

8. The combined heat dissipation device according to claim 7, characterized in that, The at least one first radiator (100) includes two first radiators, and the two first radiators and the at least one second radiator (200) are arranged in a row of radiators successively. One of the two first radiators is located at one end of the row of radiators, and the other of the two first radiators is located at the other end of the row of radiators. The cross-section of each first fin of each first radiator of the two first radiators includes a semi-circular section.

9. The combined heat dissipation device according to claim 8, characterized in that, The cross-section of each first fin of each first radiator of the two first radiators further includes a straight section extending from both ends of the semi-circular section.

10. The combined heat dissipation device according to claim 7, characterized in that, The at least one second radiator (200) further includes one or more fans mounted on one side of the second fins, and the fans of the second radiator (200) are at the same horizontal height as the fans (40) of the first radiator (100).

11. The combined heat dissipation device according to claim 7, characterized in that, The combined heat dissipation device further includes a second radiator module, and the structure of the second radiator module is the same as that of the first radiator module. The first radiator module and the second radiator module are arranged side by side, and the first radiator module and the second radiator module share a delivery header pipe (50) and a discharge header pipe (60). The input port of the delivery header pipe (50) is communicated with the oil outlet of the transformer tank, and the output port of the delivery header pipe (50) is communicated with the inlet pipe (20) of the first radiator and the inlet pipe of the second radiator; the input port of the discharge header pipe (60) is communicated with the outlet pipe (30) of the first radiator and the outlet pipe of the second radiator, and the output port of the discharge header pipe (60) is communicated with the oil inlet of the transformer tank; and the delivery header pipe (50) is located in the middle position between the first radiator module and the second radiator module; and the discharge header pipe (60) is located in the middle position between the first radiator module and the second radiator module.

12. A power transformer, the power transformer comprising a core, a winding surrounding the core, and a transformer oil tank for accommodating a coolant for cooling the core and the winding, the transformer oil tank including an oil outlet for discharging hot coolant and an oil inlet for introducing cold coolant, characterized in that, The power transformer further includes one or more radiators for a power transformer according to any one of claims 1 to 6; or the power transformer further includes one or more combined heat dissipation devices according to any one of claims 7 to 11.

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