Transformer

Abstract

The embodiment of the utility model discloses a transformer, and relates to the technical field of electrical engineering, the transformer comprises a box body and a radiator, the outer side of the box body is provided with a mounting part, the radiator comprises a radiating pipe, radiating fins and a valve, the radiating pipe communicates with the interior of the box body, the radiating fins are arranged on the radiating pipe, and the valve is arranged on the mounting part and communicates with the radiating pipe; in the technical scheme provided by the embodiment of the invention, the valve is arranged on the passage of the radiating pipe, and one end of the valve is fixed on the mounting part, so that a connecting pipe does not need to be arranged on the side wall of the box body, the valve can be directly mounted through the mounting part, and a mounting space does not need to be reserved. Through the design, the overall size of the transformer can be obviously reduced. By means of the design, installation space is saved, the space utilization rate is improved, and the structure of the radiator is simplified.

Description

Technical Field

[0001] The embodiments in this application relate to the field of electrical engineering technology, and in particular to a transformer. Background Technology

[0002] Oil-immersed transformers are electrical devices widely used in power systems. Their core components include windings, iron core, oil tank, and radiator.

[0003] A radiator typically consists of multiple fins that dissipate heat through heat exchange with the air. These fins are connected in series by cooling pipes that extend into the oil tank. Insulating oil flows through the cooling pipes and fins to dissipate heat. Valves are installed on the cooling pipes to control the flow of oil in the transformer radiator, thus enabling the radiator to open, close, and regulate its flow. The valves are installed between the fins and the oil tank. To ensure sufficient installation space for the valves, an outward-extending connecting pipe is usually installed on the outside of the oil tank. This increases the size of the radiator, which in turn increases the overall size of the transformer, requiring more installation space. Utility Model Content

[0004] Several embodiments in this application propose a transformer that is designed to provide a transformer with a smaller external size, thereby reducing its installation space.

[0005] One embodiment of this application provides a transformer comprising:

[0006] The enclosure, wherein the outer side of the enclosure is provided with a mounting portion; and

[0007] The radiator includes a heat dissipation pipe, heat dissipation fins, and a valve. The heat dissipation pipe is connected to the interior of the housing. Multiple heat dissipation fins are disposed on the heat dissipation pipe. The valve is disposed on the mounting part and is connected to the heat dissipation pipe.

[0008] In one embodiment, the mounting part includes a mounting plate and studs. The mounting plate is disposed on the housing, and at least two studs are provided on the side away from the housing. The valve is mounted on the mounting plate through the studs.

[0009] In one embodiment, the valve includes a valve body and a butterfly plate. The valve body has a first oil passage hole, the butterfly plate is rotatably disposed in the first oil passage hole, and the valve body is provided with at least two mounting holes, with each stud passing through one of the mounting holes.

[0010] In one embodiment, the end of the heat dissipation pipe near the housing is configured as a mounting flange, the mounting flange having at least two flange holes, each flange hole being coaxially arranged with a mounting hole, and the studs being sequentially inserted into the mounting hole and the flange hole.

[0011] In one embodiment, the mounting portion further includes at least two nuts, each of which is screwed onto a stud and abuts against the mounting flange.

[0012] In one embodiment, the mounting plate is welded to the housing; and / or

[0013] The mounting plate and the stud are welded together.

[0014] In one embodiment, a plurality of heat sinks are evenly spaced along the extension direction of the heat dissipation pipe.

[0015] In one embodiment, the transformer includes at least two heat dissipation pipes, each of which is connected to both ends of a heat sink.

[0016] In one embodiment, each of the heat sinks is connected to the heat pipe.

[0017] In one embodiment, the side wall of the housing is provided with an oil outlet hole, and the mounting part is formed with a second oil passage hole, the oil outlet hole and the second oil passage hole being coaxially arranged.

[0018] In several embodiments provided in this application, a mounting portion is provided on the outside of the enclosure, and the valve is mounted on the outer wall of the enclosure through the mounting portion, thereby further reducing the overall length of the radiator and thus reducing the overall size of the transformer. Specifically, the transformer includes an enclosure, heat dissipation pipes, and a valve. The heat dissipation pipes are connected to the interior of the enclosure and are equipped with multiple heat dissipation fins. The heat dissipation pipes can introduce insulating oil from the enclosure into contact with the heat dissipation fins for heat dissipation. The valve is located in the passage of the heat dissipation pipes, and one end of the valve is fixed to the mounting portion. This eliminates the need for connecting pipes on the side wall of the enclosure; the valve can be directly installed through the mounting portion without requiring pre-reserved installation space. This design significantly reduces the overall size of the transformer. This design not only saves installation space and improves space utilization but also simplifies the structure of the radiator. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments or prior art of this application, the drawings used in the description of the embodiments or 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 the structures shown in these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of an embodiment of the transformer provided in this application;

[0021] Figure 2 for Figure 1A magnified view of a section at point A in the middle;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure of the heat sink section;

[0023] Figure 4 for Figure 1 Structural diagram of the middle box section;

[0024] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0025] Figure 6 This is a schematic diagram of the mounting plate structure;

[0026] Figure 7 This is a schematic diagram of the valve body structure;

[0027] Figure 8 for Figure 7 A cross-sectional view of the valve body from another angle.

[0028] Explanation of icon numbers:

[0029] 100. Transformer; 1. Housing; 11. Mounting section; 111. Mounting plate; 111a. Second oil passage hole; 112. Stud; 113. Nut; 1a. Oil outlet hole; 2. Radiator; 21. Heat dissipation pipe; 211. Mounting flange; 211a. Flange hole; 22. Heat dissipation fin; 23. Valve; 231. Valve body; 232. Butterfly plate; 233. Valve stem; 23a. First oil passage hole; 23b. Mounting hole. Detailed Implementation

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

[0031] It should be noted that if directional indications (such as up, down, left, right, front, back, etc.) are involved in multiple embodiments of this application, the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] Furthermore, if multiple embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0033] The radiator 2 of the transformer 100 is an important component of its cooling system, typically consisting of multiple heat sinks 22. These heat sinks 22 dissipate heat through heat exchange with the air. Specifically, the heat sinks 22 are connected in series with the heat dissipation pipes 21 and are connected to the inside of the oil tank. The heat generated during the operation of the transformer 100 flows through the insulating oil in the heat dissipation pipes 21 and then through the heat sinks 22, thereby dissipating the heat and achieving effective heat dissipation. To better control the flow of insulating oil in the radiator 2, valves 23 are installed on the heat dissipation pipes 21. These valves 23 are used to open and close the radiator 2 and regulate the flow rate, thus flexibly adjusting the heat dissipation efficiency according to the actual operating conditions of the transformer 100 and the ambient temperature.

[0034] However, in the traditional design of transformer 100, to ensure sufficient space for installing these valves 23, an outward-extending connecting pipe is usually installed on the outside of the tank. While this design solves the installation problem of valve 23, it increases the overall size of the radiator 2. Consequently, the overall size of transformer 100 also increases, undoubtedly increasing the space required for its installation. Since transformer 100 typically has radiators 2 on all four sides, increasing the size of each radiator 2 causes the transformer 100 to extend outwards in all directions. In some space-constrained locations, this larger size may pose difficulties for the installation and layout of transformer 100, limiting its application scenarios. Therefore, how to optimize the layout of radiators 2 and valves 23 while ensuring heat dissipation to reduce the overall size of transformer 100 has become an important issue to consider in the design of transformer 100.

[0035] In view of the above problems, this application proposes a transformer 100 to solve the aforementioned technical problems.

[0036] Please see Figures 1 to 8 In one embodiment of this application, the transformer 100 includes a housing 1 and a radiator 2. The housing 1 has an installation part 11 on its outer side. The radiator 2 includes a heat dissipation pipe 21, heat dissipation fins 22 and a valve 23. The heat dissipation pipe 21 is connected to the interior of the housing 1. Multiple heat dissipation fins 22 are disposed on the heat dissipation pipe 21. The valve 23 is disposed on the installation part 11 and connected to the heat dissipation pipe 21.

[0037] It should be noted that the mounting part 11 and the housing 1 can be either separate or integrated; this application does not impose any restrictions on this. In one embodiment of this application, the mounting part 11 and the housing 1 are manufactured separately and then assembled for fixation. To ensure the reliability of its installation, the mounting part 11 is welded to the outer wall of the housing 1. For details, please refer to further reference. Figure 1 and Figure 2 Welding provides a high-strength connection, ensuring structural stability between the mounting part 11 and the housing 1, maintaining a firm and reliable structure even under long-term operation or vibration. Secondly, since the mounting part 11 connects to the oil outlet 1a on the side wall of the housing 1, and insulating oil enters the heat dissipation pipe 21 through the mounting part 11, welding effectively prevents oil leakage, avoiding oil seepage due to loose connections and ensuring the safe operation of the transformer 100. Furthermore, welding is a mature and simple process, facilitating processing and reducing manufacturing costs. The shape and size of the mounting part 11 can be flexibly designed according to needs, better adapting to different installation requirements and space constraints. The overall structure after welding has good consistency, contributing to improved overall aesthetics of the equipment.

[0038] It is understandable that the distance L between valve 23 and the first heat sink 22 closest to valve 23 along the axis of heat dissipation pipe 21 needs to meet relevant design standards, that is... Figure 3 The distance shown, according to relevant standards, requires that the distance L between valve 23 and the first heat sink 22 closest to valve 23 should be greater than or equal to 90mm. This ensures that valve 23 can accurately regulate the flow rate of the oil and prevents the high temperature introduced into the heat sink 22 from affecting valve 23. Based on the foregoing, the distance between valve 23 and the first heat sink 22 closest to valve 23 must be greater than the preset length value specified in the standard. Therefore, the outward extension of radiator 2 can only be controlled by compressing the space between valve body 231 and the outer wall of housing 1.

[0039] In several embodiments provided in this application, a mounting part 11 is provided on the outside of the housing 1, and the valve 23 is mounted on the outer wall of the housing 1 through the mounting part 11, thereby further reducing the overall length of the radiator 2 and thus reducing the overall size of the transformer 100. Specifically, the transformer 100 includes a housing 1, a heat dissipation pipe 21, and a valve 23. The heat dissipation pipe 21 is connected to the interior of the housing 1 and is provided with multiple heat dissipation fins 22. The heat dissipation pipe 21 can introduce insulating oil from the housing 1 into contact with the heat dissipation fins 22 for heat dissipation. The valve 23 is located in the passage of the heat dissipation pipe 21, and one end of the valve 23 is fixed to the mounting part 11. Thus, there is no need to provide a connecting pipe on the side wall of the housing 1, and the valve 23 can be directly installed through the mounting part 11 without reserving installation space. This design can significantly reduce the overall size of the transformer 100. This design not only saves installation space and improves space utilization, but also simplifies the structure of the radiator 2.

[0040] It should be noted that the mounting part 11 can fix the valve 23 and the heat dissipation pipe 21 to the housing 1 by screwing, or by a series of fixing methods such as bonding, welding, and snap-fitting. This application does not limit this. In one embodiment of this application, the mounting part 11 and the valve 23 are fixed by screwing. For details, please refer to further reading. Figure 2 and Figure 5 In this embodiment, the mounting part 11 includes a mounting plate 111 and a stud 112 located on the side of the mounting plate 111 away from the outer wall of the housing 1. The mounting plate 111 is fixed to the outer wall of the housing 1 by welding. The valve body 231 and the heat dissipation pipe 21 are passed through the stud 112, and a nut 113 is screwed into the end of the stud 112, thereby connecting the valve body 231 and the heat dissipation pipe 21 in series through the stud 112. With this installation method, there is no need to work on the side of the valve body 231 facing the housing 1. It is only necessary to pass the mounting hole 23b of the valve body 231 and the flange hole 211a of the heat dissipation pipe 21 through the stud 112 in sequence, so that the stud 112 is exposed on the outside, which makes it easy for the construction personnel to fix the nut 113 on the stud 112. Finally, the nut 113 is tightened with a wrench or other tools. Throughout the construction process, because one end of the stud 112 is exposed, there is ample operating space for construction personnel to work, eliminating the obstacle in traditional designs where connecting pipes are led out from the outer wall of the housing 1, making it difficult to install the valve 23 facing the connecting pipe side. In this embodiment, the stud 112 is fixed to one side of the mounting plate 111 by welding, thereby ensuring sufficient connection strength between the two to ensure that the stud 112 can prevent deformation and breakage when subjected to shear forces and bending moments from the valve 23 and the heat dissipation pipe 21.

[0041] Furthermore, based on the above embodiments, blind holes can be provided on the mounting plate 111, and internal threads can be configured within these blind holes to sequentially constrain the valve 23 and the heat dissipation pipe 21 onto the mounting plate 111. The mounting hole 23b on the valve 23 and the flange hole 211a on the heat dissipation pipe 21 are aligned with the blind holes on the mounting plate 111, ensuring they are on the same axis. Bolts are then used to pass through the flange hole 211a and the mounting hole 23b from one side of the heat dissipation pipe 21 and screwed onto the blind holes of the mounting plate 111. Tightening the bolts causes the bolt heads to press against the heat dissipation pipe 21, thereby fixing the valve 23 and the heat dissipation pipe 21 onto the mounting plate 111. In this embodiment, the installation operation is also performed from the outside of the valve 23 towards the heat dissipation pipe 21, resulting in a less complex overall operation and a more rational structure. It is important to note that the depth of the blind hole must not exceed the combined thickness of the mounting plate 111 and the side wall of the tank 1. Furthermore, to ensure the structural strength, heat dissipation performance, and sealing of the tank, and to prevent deformation or breakage, the bottom wall of the blind hole must be at least 2mm from the inner wall of the tank 1. The minimum depth of the blind hole should be sufficient to fully accommodate the bolt portion of the structure, ensuring the bolt has adequate structure to be threaded into the blind hole and preventing breakage under stress.

[0042] Installing valve 23 and heat dissipation pipe 21 to the outer wall of the oil tank using studs 112 or bolts ensures ease of disassembly and maintenance, reducing the difficulty of assembly and disassembly. Studs 112 and bolts can be quickly removed with simple tools such as wrenches, eliminating the need for complex tools or cutting operations, thus greatly reducing the difficulty and time cost of assembly and disassembly. In addition, using studs 112 or bolts avoids permanent damage to the oil tank wall, maintaining the integrity and sealing of the oil tank, which is beneficial to the long-term stable operation of transformer 100.

[0043] In another embodiment of this application, the mounting plate 111 can be omitted, and studs 112 can be directly welded to the outer wall of the tank 1. When the valve 23 and the heat dissipation pipe 21 are installed through the studs 112, the mounting hole 23b of the valve 23 and the flange hole 211a of the heat dissipation pipe 21 pass through the studs 112 in sequence, and one side of the valve 23 directly covers the oil outlet hole 1a of the tank 1 and abuts against the outer wall of the tank 1. By eliminating the mounting plate 111, the thickness of the mounting plate 111 can be further reduced, thereby further reducing the outward extension of the radiator 2, and thus reducing the overall size of the transformer 100. It is understood that welding materials that match the tank material should be selected to ensure welding quality and strength. During the welding process, appropriate welding processes and parameters should be adopted to avoid material performance degradation or local deformation caused by high temperature, so as to ensure that the structural strength of the tank is not damaged.

[0044] To further improve the stability and connection strength of the structure, four studs 112 are provided on one side of the mounting plate 111. For details, please refer to further documentation. Figure 6 The mounting plate 111 is generally square. A second oil passage 111a, connecting to the oil outlet 1a, is located in the center of the mounting plate 111. Four studs 112 are positioned near the four corners, arranged in a circular array around the second oil passage 111a. This even distribution at the four corners of the mounting plate 111 ensures a more secure connection between the valve 23 and the heat dissipation pipe 21, preventing loosening or deformation due to uneven local stress. This distribution effectively disperses forces, reducing stress concentration at individual connection points and enhancing the overall structural load-bearing capacity. Furthermore, the evenly distributed studs 112 provide better symmetry and balance, ensuring stability of the valve 23 and heat dissipation pipe 21 during operation, reducing vibration and sway, and extending the equipment's service life. Alternatively, the mounting plate 111 can have more than four studs 112, specifically adjusted according to the transformer 100 model, the flow rate of the heat dissipation pipe 21, and the size of the valve 23. For example, when the mounting plate 111 is circular, multiple studs 112 can be provided along the circumference. When the diameter and length of the heat sink 21 increase, the force can be effectively dispersed by increasing the number of studs 112.

[0045] In one embodiment of this application, to facilitate the fixing and installation of the heat dissipation pipe 21, the end of the heat dissipation pipe 21 near the housing 1 is provided with a mounting flange 211. For details, please refer to further details. Figure 2 The mounting flange 211 has a number of flange holes 211a that match the number of mounting holes 23b on the valve body 231, with each flange hole 211a corresponding to one mounting hole 23b. The mounting flange 211 is a disc-shaped structure extending outward from the outer peripheral wall of the heat dissipation pipe 21. The mounting flange 211 provides a large contact area, making the connection between the heat dissipation pipe 21 and the valve body 231 more secure, effectively dispersing forces and avoiding damage caused by localized stress concentration. The cooperation of multiple studs 112 further enhances the connection strength, ensuring that the heat dissipation pipe 21 and the studs 112 will not loosen or separate under long-term operation and vibration environments. Furthermore, this connection method facilitates installation and disassembly, aids in the maintenance and replacement of the heat dissipation pipe 21, and also improves the sealing performance between the heat dissipation pipe 21 and the valve body 231, preventing oil leakage and ensuring the normal operation of the cooling system.

[0046] In the technical solution of this application, the transformer 100 may have a radiator 2 installed on one of its outer side walls, or it may have radiators 2 installed on multiple outer side walls simultaneously. This application does not limit this. In one embodiment of this application, the oil tank of the transformer 100 has a square structure, and radiators 2 are installed on all four outer side walls. Each radiator 2 includes at least two heat dissipation pipes 21, one of which is an oil inlet heat dissipation pipe 21, and the other is an oil outlet heat dissipation pipe 21. When the transformer 100 is running, the insulating oil in the oil tank generates resistance losses (i.e., copper losses and iron losses) in the windings and core. These losses are converted into heat, causing the temperature of the insulating oil inside the transformer 100 to rise. The high-temperature insulating oil flows from the oil inlet heat dissipation pipe 21 into the heat sink 22. The oil inlet heat dissipation pipe 21 and the oil outlet heat dissipation pipe 21, together with the vertically parallel and equally spaced heat sink 22, form the radiator 2. Under the influence of gravity, the insulating oil flows from top to bottom through each heat sink 22, exchanging heat with the external environment through convection and radiation. The cooled insulating oil collects in the oil outlet cooling pipe 21 and then returns to the oil tank. In one embodiment of this application, both the heat sink 22 and the cooling pipe 21 are made of steel. Steel has high mechanical strength, ensuring that the radiator 2 remains stable during the operation of the transformer 100, preventing deformation or damage, thereby effectively extending the service life of the heat dissipation system. Secondly, steel has good thermal conductivity, quickly transferring the heat generated by the transformer 100 to the surface of the heat sink 22 and the cooling pipe 21, and then dissipating the heat to the surrounding environment through air convection, ensuring stable operation of the transformer within the normal temperature range and reducing the risk of failure due to overheating.

[0047] It should be noted that the valve 23 in the transformer 100 described above can be a butterfly valve, a gate valve, or a globe valve. This application does not limit the specific type of valve 23. In one embodiment of this application, the valve 23 is a butterfly valve, which mainly consists of three parts: a valve body 231, a butterfly plate 232, and a valve stem 233. For details, please refer to further reference. Figure 7 To accommodate the mounting plate 111, the valve body 231 is square in shape and has a first oil passage hole 23a in the middle. This first oil passage hole 23a connects the heat dissipation pipe 21 and the inside of the oil tank. The butterfly plate 232 is rotatably positioned at the first oil passage hole 23a and is linked with the valve stem 233 located at the upper end of the valve body 231. By rotating the upper valve stem 233, the butterfly plate 232 can be rotated relative to the valve body 231. It can be rotated to a position parallel to the liquid inlet direction, at which point the oil flow rate is the maximum; it can also be rotated to a direction perpendicular to the liquid inlet direction, at which point the valve 23 is in a closed state, and the oil cannot enter the heat dissipation pipe 21 through the valve 23; furthermore, it can be deflected at a certain angle so that the butterfly plate 232 is set at a certain angle to the liquid inlet direction, thereby ensuring that the oil flow rate decreases or increases.

[0048] In the cooling system of the oil-immersed transformer 100, using a butterfly valve to control the flow of insulating oil into the radiator 2 offers several advantages. The butterfly valve has a simple and compact structure, small size, light weight, and is very convenient to install and maintain, making it well-suited to the space and weight requirements of the radiator 2 section of the transformer 100. Secondly, the butterfly valve opens and closes rapidly; a simple rotation of the valve stem 23390 degrees is sufficient to complete a fully open or fully closed operation. This allows for a rapid response when quick adjustments to the oil flow in the radiator 2 are needed or when emergency oil circuit shut-off is required, improving the system's flexibility and safety. Finally, the butterfly valve has excellent sealing performance, achieving a reliable seal in both fully open and fully closed states, effectively preventing oil leakage and ensuring the normal operation of the transformer 100's cooling system.

[0049] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A transformer, characterized in that, include: A housing (1), wherein a mounting portion (11) is provided on the outer side of the housing (1); and The radiator (2) includes a heat dissipation pipe (21), heat dissipation fins (22) and a valve (23). The heat dissipation pipe (21) is connected to the interior of the housing (1). A plurality of heat dissipation fins (22) are disposed on the heat dissipation pipe (21). The valve (23) is disposed on the mounting part (11) and is connected to the heat dissipation pipe (21).

2. The transformer as described in claim 1, characterized in that, The mounting part (11) includes a mounting plate (111) and studs (112). The mounting plate (111) is located on the housing (1), and at least two studs (112) are provided on the side away from the housing (1). The valve (23) is mounted on the mounting plate (111) through the studs (112).

3. The transformer as described in claim 2, characterized in that, The valve (23) includes a valve body (231) and a butterfly plate (232). The valve body (231) has a first oil passage hole (23a). The butterfly plate (232) is rotatably disposed in the first oil passage hole (23a). The valve body (231) is disposed in at least two mounting holes (23b). Each stud (112) passes through one of the mounting holes (23b).

4. The transformer as described in claim 3, characterized in that, The end of the heat dissipation pipe (21) near the housing (1) is configured as a mounting flange (211). The mounting flange (211) has at least two flange holes (211a). Each flange hole (211a) is coaxially arranged with a mounting hole (23b). The stud (112) passes through the mounting hole (23b) and the flange hole (211a) in sequence.

5. The transformer as described in claim 4, characterized in that, The mounting part (11) further includes at least two nuts (113), each of which is screwed onto a stud (112) and abuts against the mounting flange (211).

6. The transformer as described in claim 2, characterized in that, The mounting plate (111) is welded to the housing (1); and / or The mounting plate (111) and the stud (112) are welded together.

7. The transformer as described in any one of claims 1 to 6, characterized in that, The plurality of heat sinks (22) are evenly spaced along the extension direction of the heat sink (21).

8. The transformer as described in claim 7, characterized in that, The transformer includes at least two heat dissipation pipes (21), and the at least two heat dissipation pipes (21) are respectively connected to both ends of each heat sink (22).

9. The transformer as described in any one of claims 1 to 6, characterized in that, Each of the heat sinks (22) is connected to the heat pipe (21).

10. The transformer as described in any one of claims 1 to 6, characterized in that, The side wall of the housing (1) is provided with an oil outlet hole (1a), and the mounting part (11) is provided with a second oil passage hole (111a). The oil outlet hole (1a) and the second oil passage hole (111a) are coaxially arranged.

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