CN115440468A - Radiator for power transformer, combined radiating device and power transformer - Google Patents

Abstract

The present invention provides a heat sink for a power transformer, a combined heat sink and a power transformer. The radiator includes a cooling fin group, a fan, an oil inlet pipe and an oil outlet pipe. The cooling fin group includes a plurality of cooling fins, and each cooling fin includes an inner wall, an outer wall, and a cooling fin cavity, thereby forming a cooling liquid path so that the heat from the transformer oil tank The hot coolant transfers the heat it carries to the surrounding air through contact with the inner and outer walls of the heat sink; each heat sink includes an arc segment, and multiple heat sinks are nested together, and the multiple heat sinks include the outer heat dissipation Fins, inner heat sinks and middle heat sinks, the fan is installed on one side of the heat sink group to form an air path, the coolant path and the air path are isolated from each other, and the heat from the heat is transmitted through the inner and outer walls of the heat sink The heat of the coolant is transferred to the external environment through the air. The radiator of the present invention limits the air output of the fan within the radiator, thereby significantly improving the cooling effect.

Description

Heat sinks for power transformers, combined heat sinks and power transformers

technical field

The present invention relates to the field of heat sinks, in particular to a heat sink for a power transformer, a combined heat sink and a power transformer.

Background technique

The heat sink structure of a traditional transformer is composed of multiple groups of heat sinks and fans, and each heat sink group is composed of multiple heat sinks arranged at equal intervals. Since the air output from the fan has an obvious rotation phenomenon, there will be more air volume leakage outside the heat sink group, which will seriously affect the cooling effect of the transformer.

At present, by arranging a plurality of cooling fin groups in combination, the air volume leaking obliquely between the cooling fin groups can be effectively utilized. However, a relatively large leakage air volume still occurs outside the heat sink group. In addition, by adding a shroud to the outside of the radiator, part of the air leakage can be blocked, but since the wind resistance of the channel formed by the shroud is smaller than that of the heat sink group, the wind that blocks leakage will overflow from the top of the shroud and cannot return to heat dissipation cooling in the stack.

Contents of the invention

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

According to an aspect of the present invention, there is provided a heat sink for a power transformer comprising an iron core, windings surrounding the iron core, and containing a cooling fluid for cooling the iron core and the windings A transformer oil tank, the transformer oil tank includes an oil outlet for discharging hot cooling liquid and an oil inlet for introducing cold cooling liquid, the radiator includes a heat sink group, a fan, an oil inlet pipe and an oil outlet pipe, The oil inlet pipe communicates with the oil outlet of the transformer oil tank, and the oil outlet pipe communicates with the oil inlet of the transformer oil tank,

Wherein, the heat sink group includes a plurality of first heat sinks, and each of the first heat sinks in the plurality of first heat sinks includes an inner wall, an outer wall, and a heat dissipation wall defined between the inner wall and the outer wall. The fin cavity, the fin inlet communicating with the fin cavity, and the fin outlet communicating with the fin cavity, the fin inlet communicating with the oil inlet pipe, the fin outlet communicating with the fin The oil outlet pipe is connected, so as to reach the transformer from the oil outlet of the transformer oil tank, through the oil inlet pipe, through the inlet of the heat sink, through the cavity of the heat sink, and through the outlet of the heat sink. The coolant path of the oil inlet of the oil tank, so that the hot coolant from the transformer oil tank transfers the heat it carries to ambient air transfer;

Wherein, each of the plurality of first cooling fins extends along an axial direction, and a cross-section perpendicular to the axial direction of each first cooling fin includes an arc segment, and The inner diameters of the arc segments of each of the first heat sinks are different from each other, the plurality of first heat sinks are nested in a concentric arrangement with each other, and the arc shapes of the plurality of first heat sinks The sections are located in the same angular area in the circumferential direction, and the plurality of first heat sinks include the outermost heat sink, the innermost inner heat sink, and the outer heat sink and the inner heat sink. multiple intermediate heat sinks between the inner heat sinks,

Wherein, the air outlet of the fan is installed on one side of the cooling fin group along the axial direction, and the other side of the cooling fin group along the axial direction communicates with the external environment ;

Wherein, a first air passage along the axial direction is formed among the outer heat sink, the middle heat sink, and the inner heat sink, so as to form a passage from the air outlet of the fan to the The air path from the first air path to the external environment, the cooling liquid path and the air path are isolated from each other, and the air transmitted through the inner wall and the outer wall of the plurality of first cooling fins from The heat of the hot coolant is transferred to the surrounding environment by the air flowing through the air path.

In an exemplary embodiment, one or more of the plurality of intermediate fins has an opening therethrough such that between the plurality of first fins and the axial are communicated with each other in the radial direction perpendicular to the direction, thereby forming a second air passage for air circulation in the radial direction to guide the flow on the first air passage along the axial direction The air flows in the radial direction.

In an exemplary embodiment, each of the plurality of intermediate fins has the opening, and the opening of one of the plurality of intermediate fins is connected to the intermediate fin. The openings of adjacent intermediate fins adjacent to each other are located in different angular regions in the circumferential direction to guide the region between two adjacent first fins having a relatively higher temperature The flowing air passes through the corresponding opening after flowing for a certain distance in the radial direction, and enters a region between two adjacent first cooling fins having a relatively lower temperature.

In an exemplary embodiment, each of the plurality of intermediate fins has at least two of the openings, and an outline of each of the at least two of the openings is cuboid.

In an exemplary embodiment, when the axial direction of the cooling fin group is in the vertical direction, the oil inlet pipe is located at the upper end of the cooling fin group, and the oil outlet pipe is located at the upper end of the cooling fin group. the lower end of the group;

Wherein, the upper end of the cooling fin group is formed with a first groove for receiving the oil inlet pipe, and the first groove is formed on the upper end of each first cooling fin in the plurality of first cooling fins. the first recessed portion of;

And wherein, the lower end of the cooling fin group is formed with a second groove for receiving the oil outlet pipe, and the second groove includes the lower end of each first cooling fin in the plurality of first cooling fins Formed second recess.

In an exemplary embodiment, each of the outer fins and the intermediate fins is hollow cylindrical in shape.

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 arc-shaped, and There is a first separation space and a second separation space between the first sheet and the second sheet.

According to another aspect of the present invention, a combined heat sink is provided, the combined heat sink includes a first heat sink module, and the first heat sink module includes at least one first heat sink and at least one second heat sink The first radiator is a radiator for a power transformer according to any one of the above-mentioned solutions of the present invention, and the second radiator includes a plurality of second radiator fins in the shape of a flat plate. The second cooling fins are stacked together to form a rectangular parallelepiped radiator.

In an exemplary embodiment, the at least one first radiator includes two first radiators, and the two first radiators and the at least one second radiator are successively arranged in a row of radiators, so 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 two first A cross-section of each first fin of each of the first heat sinks includes a semicircular section.

In an exemplary embodiment, the cross-section of each first heat sink of each of the two first heat sinks further includes straight lines extending from both ends of the semicircular section segment.

In an exemplary embodiment, the at least one second heat sink further includes one or more fans installed on one side of the second heat sink, and the fans of the second heat sink are connected to the first The fans of the radiator are on the same level.

In an exemplary embodiment, the combined heat dissipation device further includes a second heat sink module, the structure of the second heat sink module is the same as that of the first heat sink module, and the first heat sink module The 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 collection pipe and a discharge oil collection pipe, and the input port of the delivery oil collection pipe is connected to the The oil outlet of the transformer oil tank is connected, and the output port of the delivery oil collecting pipe is connected with the oil inlet pipe of the first radiator and the oil inlet pipe of the second radiator; the input port of the discharge oil collecting pipe is connected with The oil outlet pipe of the first radiator communicates with the oil outlet pipe of the second radiator, and the output port of the discharge oil collection pipe communicates with the oil inlet of the transformer oil tank;

And the delivery oil collecting pipe is located in the middle of the first radiator module and the second radiator module; and the discharge oil collecting pipe is located in the middle of the first radiator module and the second radiator module in the location.

According to another aspect of the present invention, there is provided a power transformer comprising an iron core, a winding surrounding the iron core, and a transformer oil tank containing cooling liquid for cooling the iron core and the winding, The transformer oil tank includes an oil outlet for discharging hot cooling liquid and an oil inlet for introducing cold cooling liquid, and the power transformer also includes one or more of any of the above solutions according to the present invention The heat sink for a power transformer; or the power transformer further includes one or more combined heat sinks according to any of the above-mentioned solutions of the present invention.

Through the heat sink for power transformer, combined heat dissipation device and power transformer of the present invention, beneficial technical effects of at least the following aspects can be achieved.

First, in the solution of the present invention, since the cross-section perpendicular to the axial direction of each first heat sink includes an arc segment, the outer contour of the heat sink that is closed in the circumferential direction is formed by the outer layer of heat sink, Since the air flowing between the layers of the radiator can be well confined in 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 efficient. Reasonable.

Second, in the solution of the present invention, since the middle cooling fin has an opening passing therethrough, the air flowing on the first air passage along the axial direction can be guided to flow in the radial direction, therefore, the present invention The cooling efficiency of the radiator used for the power transformer can be significantly improved, and the temperature rise of the transformer can be effectively reduced, thereby improving the performance of the transformer.

Thirdly, the present invention can achieve higher cooling performance of the radiator used for power transformers, and can reduce the cooling area of the radiator or the number of fans, thereby saving space and effectively reducing the cost of the transformer.

Description of drawings

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that those of ordinary skill in the art will be more aware of the above-mentioned and other features and advantages of the present invention. In the accompanying drawings:

Fig. 1 is a schematic perspective view of a heat sink for a power transformer according to an exemplary embodiment of the present invention.

Fig. 2 is another schematic perspective view of a heat sink for a power transformer according to an exemplary embodiment of the present invention.

Fig. 3 is a schematic bottom view of a heat sink for a power transformer according to an exemplary embodiment of the present invention.

Fig. 4 is a schematic perspective view of a heat sink set for a heat sink of a power transformer according to an exemplary embodiment of the present invention.

5 is another schematic perspective view of a heat sink set for a heat sink of a power transformer according to an exemplary embodiment of the present invention, wherein for the purpose of clarity, the outer layer of heat sinks is deleted.

Fig. 6 is a schematic perspective view of a combined heat dissipation device according to an exemplary embodiment of the present invention.

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

Fig. 8 is a schematic front view of a combined heat sink according to an exemplary embodiment of the present invention.

Fig. 9 is a schematic side view of a combined heat sink according to an exemplary embodiment of the present invention.

FIG. 10 is another schematic perspective view of the combined heat sink according to an exemplary embodiment of the present invention, which is viewed from above the combined heat sink.

Fig. 11 is another perspective view of the combined heat sink according to an exemplary embodiment of the present invention, which is viewed from the lower side of the combined heat sink.

Wherein, the reference signs are as follows:

10. Heat sink group

100. The first radiator

101. Outer heat sink

102. Middle heat sink

103. Inner heat sink

1031: first piece

1032: second film

20. Oil inlet pipe

30. Outlet pipe

40. Fan

50. Delivery oil collection pipe

60. Discharge oil collection pipe

70. Install the frame

80. Support

81. Support rib

104. opening

105. First concave part

106. Second concave part

200. Second radiator

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the following examples are given to further describe the present invention in detail. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, singular forms are intended to include plural forms unless the context clearly dictates otherwise.

First, please refer to FIG. 1 and FIG. 2 , which show perspective schematic diagrams of a heat sink for a power transformer according to an exemplary embodiment of the present invention from different angles. The power transformer is not shown in Figures 1 and 2, and it is known that a power transformer includes an iron core, windings surrounding the iron core, and a transformer oil tank containing cooling fluid for cooling the iron core and windings, the transformer oil tank including for draining Outlet for hot coolant and inlet for cold coolant. The radiator of the present invention can be arranged in the surrounding space of the power transformer, such as above or on the side, etc. as required.

Referring to Fig. 1, the radiator includes fin group 10, blower fan 40, oil inlet pipe 20 and oil outlet pipe 30, and oil inlet pipe 20 is used for communicating with the oil outlet of transformer oil tank, to receive the cooling liquid from the heat of transformer oil tank, and outlet The oil pipe 30 is used to communicate with the oil inlet of the transformer oil tank, so as to transport the cooled cooling liquid back to the transformer oil tank, thereby forming a circulation loop of the cooling liquid. When the axial direction of the cooling fin group 10 is in the vertical direction, the oil inlet pipe 20 is located at the upper end of the cooling fin group 10, and the oil outlet pipe 30 is located at the lower end of the cooling fin group 10,

Referring to Fig. 2, the cooling fin group 10 includes: a plurality of first cooling fins, each of the first cooling fins in the plurality of first cooling fins includes an inner wall, an outer wall, a cooling fin cavity defined between the inner wall and the outer wall ( not shown in the figure), the fin inlet (not shown) communicated with the fin cavity and the fin outlet (not shown) communicated with the fin cavity, the fin inlet and the oil inlet pipe 20 Connected, the outlet of the cooling fin is connected with the oil outlet pipe 30, thereby forming the oil outlet of the transformer oil tank from the oil outlet of the transformer oil tank, passing through the oil inlet pipe 20, passing through the inlet of the cooling fin, passing through the cavity of the cooling fin, and passing through the outlet of the cooling fin to reach the oil inlet of the transformer oil tank The coolant path is such that the hot coolant from the transformer oil tank transfers the heat it carries to the surrounding air through contact with the inner and outer walls of the plurality of first cooling fins. Although the structures of the fin cavity, fin inlet and fin outlet of each fin are not shown in the drawings, those skilled in the art can easily understand and implement the specific structure of each fin.

Referring to FIG. 2 , each of the plurality of first cooling fins extends along the axial direction (ie, the vertical direction in FIG. 2 ), and each first cooling fin is perpendicular to the axial direction. The cross-sections all include an arc segment (in the example of FIG. 2, it is specifically a circle), and the inner diameters of the arc segments of each first cooling fin are different from each other, and a plurality of first cooling fins are concentrically arranged with each other. The arc segments of the plurality of first cooling fins are nested together and located in the same angular area in the circumferential direction. The plurality of first heat sinks include an outermost heat sink 101 , an innermost inner heat sink 103 , and a plurality of intermediate heat sinks 102 between the outer heat sink 101 and the inner heat sink 103 . The plurality of first cooling fins may have the same length in the axial direction. Since the cross-section perpendicular to the axial direction of each first heat sink includes an arc segment, the outer contour of the heat sink that is closed in the circumferential direction is formed by the outer layer heat sink 101, since the flow through the heat sink group 10 can be The air between the first cooling fins is well confined in the circumferentially closed outer contour of the radiator, which can reduce the leakage of the cooling air volume used for the radiator of the power transformer and make the cooling structure more reasonable.

Referring to FIG. 2 , the air outlet of the fan 40 is installed on one side of the fin assembly 10 along the axial direction, and the other side of the fin assembly 10 along the axial direction communicates with the external environment. A first air passage along the axial direction is formed between the outer heat sink 101, the middle heat sink 102, and the inner heat sink 103, so as to form an air path from the air outlet of the fan 40 to the external environment through the first air passage The cooling liquid path and the air path are isolated from each other, and the heat from the hot cooling liquid transferred through the inner and outer walls of the plurality of first cooling fins is transferred to the external environment through the air flowing through the air path. When the axial direction is in the vertical direction, the fan 40 is located at a position below the fin group 10 . Furthermore, the structure of the fan 40 is clearly shown in FIG. 3 .

Referring to FIGS. 4 and 5 , one or more of the plurality of intermediate fins 102 (preferably each intermediate fin) includes an opening 104 therethrough that forms an air duct such that at the plurality of first A cooling fin communicates with each other in a radial direction perpendicular to the axial direction, thereby forming a second air passage for air circulation in the radial direction to guide the first air passage along the axial direction. The air flowing in the passage flows in the radial direction.

4 and 5, each of the plurality of intermediate fins 102 has an opening 104, and the opening of one intermediate fin in the plurality of intermediate fins 102 is adjacent to the adjacent fin. The openings of the middle cooling fins are located in different angular regions in the circumferential direction to guide the air flowing in the region between two adjacent first cooling fins having a relatively high temperature to flow in the radial direction for a section. After a distance, pass through the corresponding opening 104 into the region between two adjacent first cooling fins having a relatively lower temperature. In other words, with this arrangement, the opening of the intermediate fin is not directly facing the opening of the adjacent intermediate fin, whereby the air from the opening of the intermediate fin cannot flow directly into the opening of the adjacent intermediate fin , that is, the openings of the fins of each layer are staggered to avoid direct penetration.

4 and 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 fins; and at least The profile of each of the two openings 104 may be cuboid. Specifically, each of the plurality of intermediate fins 102 has two openings, and the two openings are spaced apart by 180 degrees in the circumferential direction. Of course, each of the plurality of intermediate fins 102 may include more than three openings, and these openings may be equidistantly arranged.

In Fig. 5, it is clearly shown that the shape of each opening 104 is a cuboid, and is basically located at the middle position of each intermediate fin 102 in the axial direction, and the extension of the opening 104 in the axial direction The length may be 1/2 to 3/4 of the length of the middle cooling fin 102 in the axial direction, such as 2/3. Of course, it can be understood that the shape and size of each opening can be adaptively adjusted according to specific conditions. For example, the outer contour of the opening may be in the shape of an ellipse or the like. In addition, the distribution of the openings on each intermediate fin 102 can also be adjusted appropriately.

4 and 5, the upper end of the cooling fin group 10 is formed with a first groove for receiving the oil inlet pipe 20. The first concave portion 105; and the lower end of the cooling fin group 10 is formed with a second groove for receiving the oil outlet pipe 30, and the second groove includes a lower end of each first cooling fin in a plurality of first cooling fins. The second concave portion 106 (refer to FIG. 5 ).

Referring to FIGS. 2 and 4 , each of the outer layer fins 101 and the middle fins 102 has a hollow cylindrical shape. Referring to Fig. 4, 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 arc-shaped, and in the first sheet 1031 There is a first space and a second space between the second sheet 1032 .

Referring to FIGS. 6 to 11 , a combined heat sink according to an exemplary embodiment of the present invention is shown from various 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 delivery oil collection pipe 50 and a discharge oil collection pipe 60 .

Referring to Fig. 10, the input port of the delivery oil collecting pipe 50 is used to communicate with the oil outlet of the transformer oil tank, and the output port of the delivery oil collecting pipe 50 is used to communicate with the oil inlet pipe 20 of the first radiator and the oil inlet pipe of the second radiator .

Referring to Fig. 11, the input port of the discharge oil collecting pipe 60 is used to communicate with the oil outlet pipe 30 of the first radiator and the oil outlet pipe of the second radiator, and the output port of the discharge oil collecting pipe 60 is used to communicate with the oil inlet of the transformer oil tank. The delivery oil collecting pipe 50 is located in a position intermediate the first radiator module and the second radiator module; and the discharge oil collecting pipe 60 is located in a position intermediate the first radiator module and the second radiator module.

Since the structure of the second radiator module is basically the same as that of the first radiator module, the description below will mainly focus on the structure of the first radiator module. 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.

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 radiators described with reference to FIGS. 1 to 5, but there are differences, which will be explained below , which can also be clearly seen from the attached figure. The second heat sink 200 includes a plurality of plate-shaped second heat sinks, and the plurality of plate-shaped second heat sinks may be arranged at equal intervals and stacked together to form a rectangular parallelepiped heat sink.

Referring to FIG. 6 , at least one first heat sink 100 may specifically include two first heat sinks 100 , and the two first heat sinks 100 and a plurality of second heat sinks 200 are successively arranged in a row of heat sinks. 7, one of the two first radiators 100 is located at one end of a row of radiators, and the other of the two first radiators 100 is located at the other end of a row of radiators. The two first radiators 100 The cross-section of each fin of each first heat sink includes a semicircular section. In addition, referring to FIG. 6, it can be seen that the cross-section of each fin of each of the two first heat sinks 100 may also include a straight section extending from both ends of the semicircular section, The length of these two linear sections in the axial direction along the delivery oil collecting pipe 50 is about half of the length of the single second radiator 200 in the axial direction along the delivery oil collecting pipe 50 one. That is to say, each fin of each of the two first heat sinks 100 includes both a half-hollow cylindrical portion and a plate-shaped portion. Of course, in different implementations, according to different requirements, the shape of the first heat sink 100 may only include half a hollow cylindrical part, or may include the entire hollow cylindrical part, that is, include Fig. 1 to A first heat sink as shown in FIG. 5 .

With reference to Fig. 7, a plurality of second radiators 200 also includes fans installed on one side of a plurality of plate-shaped fins, the fans of the second radiators 200 are at the same level as the fans 40 of the first radiators 100 .

Referring to Fig. 9, there are one or more supports 80 between the delivery oil collection pipe 50 and the discharge oil collection pipe 60, such as two supports (only one support can be seen from the angle in Fig. Support tube or other suitable form. In addition, in order to strengthen the supporting effect, a supporting rib 81 may be arranged on the side of the supporting member 80, and the supporting rib may be a triangular supporting rib (a vertical bar when viewed from the perspective in FIG. 9 ). Referring to FIG. 6 , there are also shown two mounting frames 70 which may be used to fix and hold the first radiator module and the first radiator module.

The present invention also provides a power transformer. The power transformer includes an iron core, a winding surrounding the iron core, and a transformer oil tank containing cooling liquid for cooling the iron core and the winding. port and an oil inlet for introducing cold coolant, and the power transformer includes the heat sink described with reference to FIGS. 1 to 5 , and/or includes the combined heat sink device described with reference to FIGS. The heat sink and/or the combined heat sink can be arranged around the transformer.

Using the improved heat sink or combined heat dissipation device of the present invention can limit the air output of the fan to the heat sink for effective cooling, thus significantly improving the cooling effect.

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

Claims (13)

1. A heat sink for a power transformer, the power transformer comprising a core, a winding surrounding the core, and a transformer tank containing a coolant for cooling the core and the winding, the transformer tank comprising an oil outlet for discharging hot coolant and an oil inlet for introducing cold coolant,

the radiator is characterized by comprising a radiating fin group (10), a fan (40), an oil inlet pipe (20) and an oil outlet pipe (30), wherein the oil inlet pipe (20) is communicated with the oil outlet of the transformer oil tank, the oil outlet pipe (30) is communicated with the oil inlet of the transformer oil tank,

wherein said fin pack (10) comprises a first plurality of fins, each of said first plurality of fins comprising an inner wall, an outer wall, a fin cavity defined between said inner wall and said outer wall, a fin inlet in communication with said fin cavity and a fin outlet in communication with said fin cavity, said fin inlet being in communication with said oil inlet tube (20) and said fin outlet being in communication with said oil outlet tube (30) to thereby form a coolant path from said oil outlet of said transformer tank, through said oil inlet tube (20), through said fin inlet, through said fin cavity, through said fin outlet to said oil inlet of said transformer tank such that hot coolant from said transformer tank transfers entrained heat to ambient air through contact with said inner wall and said outer wall of said first plurality of fins;

wherein each of the plurality of first fins extends along an axial direction, and a cross section of each first fin perpendicular to the axial direction includes an arc-shaped section, and inner diameters of the arc-shaped sections of each first fin are different from each other, the plurality of first fins are nested together in a concentric arrangement with each other and the arc-shaped sections of the plurality of first fins are located in the same angular region in a circumferential direction, the plurality of first fins include an outer fin (101) located at an outermost side, an inner fin (103) located at an innermost side, and a plurality of intermediate fins (102) located between the outer fin (101) and the inner fin (103),

the air outlet of the fan (40) is mounted on one side of the radiating fin group (10) along the axial direction, and the other side of the radiating fin group (10) along the axial direction is communicated with the external environment;

wherein a first air passage is formed between the outer fins (101), the intermediate fins (102), and the inner fins (103) along the axial direction to form an air path from the air outlet of the fan (40) to the external environment through the first air passage, the coolant path and the air path being isolated from each other, and heat from the heated coolant transferred through the inner and outer walls of the plurality of first fins is transferred to the external environment through air flowing through the air path.

2. The heat sink for a power transformer according to claim 1, wherein one or more of the plurality of intermediate fins (102) have an opening (104) therethrough so as to communicate with each other in a radial direction perpendicular to the axial direction between the plurality of first fins, thereby forming a second air passage for air circulation in the radial direction to guide the flow of air flowing on the first air passage along the axial direction in the radial direction.

3. The heat sink for a power transformer according to claim 2, wherein each of the plurality of intermediate fins (102) has the opening (104), and the opening of one intermediate fin of the plurality of intermediate fins (102) and the opening of an adjacent intermediate fin adjacent thereto are located in different angular regions in a circumferential direction to guide air flowing in a region between two adjacent first fins having a relatively high temperature to flow through the respective opening (104) into a region between two adjacent first fins having a relatively low temperature after flowing for a distance in the radial direction.

4. The heat sink for a power transformer according to claim 3, wherein each of the plurality of intermediate heat sinks (102) has at least two of the openings (104), and the outline of each of the at least two openings (104) is rectangular parallelepiped.

5. The radiator for a power transformer according to claim 4, characterized in that when the axial direction of the fin group (10) is in a vertical direction, the oil inlet pipe (20) is located at an upper end of the fin group (10) and the oil outlet pipe (30) is located at a lower end of the fin group (10);

wherein the upper end of the fin group (10) is formed with a first groove for receiving the oil inlet pipe (20), the first groove including a first recess (105) formed at the upper end of each of the plurality of first fins;

and wherein a lower end of the fin group (10) is formed with a second groove for receiving the oil outlet pipe (30), the second groove including a second recessed portion (106) formed at a lower end of each of the plurality of first fins.

6. The heat sink for an electric transformer according to any of claims 1 to 5, characterized in that each of the outer fins (101) and the intermediate fins (102) is a hollow cylindrical shape.

7. The heat sink for power transformers according to claim 6, characterized in that the inner fins (103) comprise a first sheet (1031) and a second sheet (1032) opposite to each other, a cross section of the first sheet (1031) and a cross section of the second sheet (1032) are both circular arc shaped, and a first and a second spacing space exist between the first sheet (1031) and the second sheet (1032).

8. A combined heat sink, characterized in that it comprises a first heat sink module comprising at least one first heat sink (100) and at least one second heat sink (200), the first heat sink (100) being a heat sink for an electrical transformer according to any one of claims 1 to 5, the second heat sink (200) comprising a plurality of second fins of flat plate shape, the second fins being stacked together to constitute a heat sink in the form of a rectangular parallelepiped.

9. The combined heat sink according to claim 8, wherein the at least one first heat sink (100) comprises two first heat sinks, the two first heat sinks and the at least one second heat sink (200) being arranged in succession in a row of heat sinks, one of the two first heat sinks being located at one end of the row of heat sinks and the other of the two first heat sinks being located at the other end of the row of heat sinks, the cross-section of each first fin of each of the two first heat sinks comprising a semicircular section.

10. The combined heat sink of claim 9 wherein the cross-section of each first fin of each of the two first heat sinks further comprises a linear section extending from both ends of the semi-circular section.

11. The combined heat sink according to claim 8, characterised in that the at least one second heat sink (200) further comprises one or more fans mounted on one side of the second fins, the fans of the second heat sink (200) being at the same level as the fans (40) of the first heat sink (100).

12. The combined heat sink of claim 8, further comprising a second radiator module having the same structure as the first radiator module, the first radiator module being arranged side-by-side with the second radiator module, the first and second radiator modules sharing one delivery oil header (50) and one drain oil header (60), an input port of the delivery oil header (50) being in communication with the oil outlet of the transformer tank, and an output port of the delivery oil header (50) being in communication with an oil inlet pipe (20) of the first radiator and an oil inlet pipe of the second radiator; an input port of the drain oil collecting pipe (60) is communicated with an oil outlet pipe (30) of the first radiator and an oil outlet pipe of the second radiator, and an output port of the drain oil collecting pipe (60) is communicated with the oil inlet of the transformer oil tank;

and the delivery oil collection pipe (50) is located in a position intermediate the first and second radiator modules; and the drain oil trap (60) is located in a position intermediate the first radiator module and the second radiator module.

13. A power transformer comprising a core, windings surrounding the core, and a transformer tank containing a cooling liquid for cooling the core and the windings, the transformer tank comprising an oil outlet for discharging hot cooling liquid and an oil inlet for introducing cold cooling liquid, characterized in that the power transformer further comprises one or more radiators for power transformers according to any of claims 1-7; or the power transformer further comprises one or more combined heat sinks according to any of claims 8 to 12.

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