Transformer oil tank with internal heat dissipation structure

Abstract

The utility model discloses a transformer oil tank with heat dissipation structure, including oil tank and the first heat dissipation structure of setting in the oil tank outside, the inside wall of oil tank is equipped with second heat dissipation structure, and second heat dissipation structure is sawtooth fin. Sawtooth fin includes edge base end and sawtooth end, and sawtooth end is perpendicular to edge base end, and edge base end is fixedly connected with the inside wall of oil tank, and sawtooth end is concave-convex structure. The utility model discloses through sawtooth fin, increases the heat dissipation area in the limited internal space of transformer, disturbs oil flow to destroy thermal boundary layer and promotes turbulent flow, and forms the complementary mechanism with first heat dissipation structure simultaneously, and the heat exchange efficiency of oil tank inner wall and transformer oil is promoted.

Description

Technical Field

[0001] This utility model relates to, but is not limited to, the field of power equipment technology, and in particular to a transformer oil tank with an internal heat dissipation structure. Background Technology

[0002] The heat dissipation principle of transformers is mainly based on three heat transfer methods: heat conduction, heat convection, and heat radiation. Oil-immersed transformers transfer the heat generated by internal losses to the outside through insulating oil and heat dissipation structures. If the heat cannot be dissipated in time, the internal temperature of the transformer will rise, which will not only reduce the life of the insulation materials, but may also cause insulation breakdown, short circuits and other faults, seriously affecting the safe and stable operation of the power system.

[0003] With the development of power grids and the growth of electricity demand, the capacity of transformers is constantly increasing, and the heat generated per unit volume is also increasing, while their size is becoming increasingly compact. Therefore, it is urgent to take measures to improve heat dissipation efficiency. Utility Model Content

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims. This invention aims to at least solve one of the technical problems existing in the prior art. To this end, embodiments of this invention provide a transformer oil tank with an internal heat dissipation structure, which can improve heat dissipation efficiency within the constraints of the limited space of the transformer oil tank.

[0005] This utility model embodiment provides a transformer oil tank with an internal heat dissipation structure, including an oil tank and a first heat dissipation structure disposed on the outside of the oil tank. A second heat dissipation structure is provided on the inner side wall of the oil tank. The second heat dissipation structure is a serrated fin. The serrated fin includes an edge base end and a serrated end. The serrated end is perpendicular to the edge base end. The edge base end is fixedly connected to the inner side wall of the oil tank. The serrated end has a concave-convex structure.

[0006] According to some embodiments of the present invention, the edge base end is fixedly connected to the inner sidewall of the oil tank by bolts.

[0007] According to some embodiments of the present invention, the edge base end is welded to the inner wall of the oil tank.

[0008] According to some embodiments of the present invention, the serrated fins are arranged along a first direction, which is the natural convection direction of transformer oil.

[0009] According to some embodiments of the present invention, there are multiple serrated fins, and the multiple serrated fins are distributed at intervals along the length direction of the inner sidewall of the oil tank.

[0010] According to some embodiments of the present invention, the serrated fin includes multiple fin units, which are arranged in a staggered manner.

[0011] According to some embodiments of the present invention, the fin units of two adjacent serrated fins are misaligned in the same direction.

[0012] According to some embodiments of the present invention, the first heat dissipation structure is a corrugated sheet.

[0013] According to some embodiments of this utility model, the oil tank contains a transformer body.

[0014] The present invention has at least the following beneficial effects: by using serrated fins, the heat dissipation area is increased within the limited internal space of the transformer, and the oil flow is disturbed to destroy the thermal boundary layer and promote turbulence. At the same time, it forms a complementary mechanism of "heat zoning and conduction + oil convection circulation" with the first heat dissipation structure outside the oil tank, which ultimately improves the heat exchange efficiency between the inner wall of the oil tank and the transformer oil.

[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0016] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0017] Figure 1 This is a schematic diagram of a transformer oil tank with an internal heat dissipation structure provided in one embodiment of the present invention; Figure 2 This is a top view of a transformer oil tank provided in one embodiment of the present invention; Figure 3 This is an overall structural diagram of the second heat dissipation structure provided in one embodiment of the present invention; Figure 4 This is an overall structural diagram of the second heat dissipation structure provided in another embodiment of the present invention; Reference numerals: oil tank 110; second heat dissipation structure 120; edge base 210; serrated end 220; mounting hole 310. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0023] See Figure 1 , Figure 1 This is a schematic diagram of a transformer tank with an internal heat dissipation structure according to an embodiment of the present invention. It includes a tank 110 and a first heat dissipation structure disposed on the outside of the tank 110. A second heat dissipation structure 120, specifically a serrated fin, is also provided on the inner wall of the tank 110. The serrated fin, as the core component of the second heat dissipation structure 120, effectively improves the heat dissipation efficiency of the transformer oil to the tank wall 110 by increasing the heat dissipation contact area and enhancing the convection disturbance of the transformer oil, thereby improving the operating stability and capacity potential of the transformer.

[0024] like Figure 2 and Figure 3As shown, the serrated fin structure specifically includes an edge base end 210 and a serrated end 220. The serrated end 220 is perpendicular to the edge base end 210, which is fixedly connected to the inner wall of the oil tank 110. The serrated end 220 itself has an alternating concave-convex structure to further optimize convection cooling. It should be noted that when connecting the edge base end 210 to the oil tank 110, it can first achieve a tight fit with the inner wall of the oil tank 110, and then be fixedly connected through a specific method. The specific connection method can be selected according to the actual scenario. Relevant feasible embodiments are as follows: In one feasible embodiment, such as Figure 4 As shown, mounting holes 310 are pre-set at the four corners of the serrated fin. During actual installation, the edge base 210 can be fixedly connected to the inner wall of the oil tank 110 by bolts through the mounting holes 310.

[0025] In one feasible embodiment, the edge base 210 can also be directly connected to the inner wall of the fuel tank 110 by welding. This method can improve the connection strength between the edge base 210 and the fuel tank 110 wall and reduce the risk of loosening during long-term use.

[0026] In one feasible embodiment, the serrated fins are arranged along a first direction, which is consistent with the natural convection direction of the transformer oil (e.g., vertical direction), thereby ensuring that the transformer oil can fully contact the fins during natural convection and maximize heat dissipation efficiency.

[0027] In one feasible embodiment, the number of serrated fins is set to multiple, and the multiple serrated fins are distributed at intervals along the length direction of the inner sidewall of the oil tank 110. The interval distance can be determined according to the inner wall size of the oil tank 110 and the heat dissipation requirements, so as to avoid the fins being too dense and affecting the oil flow circulation, and to ensure sufficient heat dissipation area.

[0028] In one feasible embodiment, a single serrated fin is composed of multiple independent fin units, and the multiple fin units are staggered on the fin body. This design can break the laminar flow state in the transformer oil flow process, form local turbulence, and further enhance the heat exchange between the oil and the fins.

[0029] In a feasible embodiment, when multiple serrated fins are provided on the inner sidewall of the oil tank 110, the fin units of two adjacent serrated fins are misaligned in the same direction. This arrangement can make the oil flow direction in the oil tank 110 more regular, avoid mutual interference between the misaligned structures of different fins, and ensure the overall convection effect is stable.

[0030] In a feasible embodiment, the first heat dissipation structure is specifically a corrugated sheet. By increasing the contact area between the outside of the oil tank 110 and the air, the corrugated sheet can efficiently transfer the heat absorbed by the wall of the oil tank 110 to the external environment, forming an "inner-outer" synergistic heat dissipation with the second heat dissipation structure 120 inside the oil tank 110, further improving the overall heat dissipation performance.

[0031] In a feasible embodiment, the oil tank 110 is also equipped with a transformer body. The heat generated by the transformer body during operation is directly transferred to the surrounding transformer oil. Then, through the heat dissipation path of "second heat dissipation structure - oil tank wall - first heat dissipation structure - outside air", the heat is quickly discharged, ensuring the long-term stable operation of the transformer body.

[0032] This application has at least the following technical effects: 1. The heat dissipation component features zigzag fins in a "Z" shape. This concave-convex design creates a three-dimensional space in the longitudinal direction, while the zigzag edges increase the heat dissipation surface area in the lateral direction. Thanks to this dual design of "concave-convex + three-dimensional," the zigzag fins effectively increase the heat dissipation area within the limited internal space of the transformer, allowing for more thorough contact between the fins and the transformer oil. This enables faster transfer of heat generated during transformer operation to the transformer oil, thus aiding in heat dissipation and ultimately improving the heat exchange efficiency between the inner wall of the tank and the transformer oil.

[0033] 2. A zigzag fin is applied to the inner wall of the transformer tank. The zigzag edges refer to the irregular contours formed laterally on the fins. When transformer oil (fluid) flows through, the uneven structure of the edges directly interferes with the local flow field, generating small-scale eddies. The zigzag bend design creates a three-dimensional structure longitudinally on the fins, altering the overall flow path of the transformer oil. The combination of the uneven edges and the zigzag bend design changes the flow trajectory of the transformer oil and disturbs the oil flow, effectively disrupting the thermal boundary layer (i.e., the layer hindering heat transfer) and promoting turbulence (under the same conditions, turbulent heat transfer is significantly more intense than laminar flow). This allows for more thorough contact between the oil flow and the fin surface, further improving heat dissipation.

[0034] It is understandable that the thermal boundary layer of the oil flow refers to the thin layer region with a significant temperature gradient formed near the solid surface when transformer oil flows through the tank wall, fins, and other solid surfaces due to fluid viscosity and heat transfer. Specific characteristics are as follows: ① Near the solid wall, the oil temperature is almost the same as the wall temperature, which is the area of ​​most direct heat exchange; ② Extending from the wall to the main oil flow body, the oil temperature gradually transitions to the temperature of the main oil flow body, and the temperature gradient decreases from large to small; ③ The temperature of the main oil flow body outside the thermal boundary layer is uniform, and it hardly participates in direct heat exchange with the solid surface. Heat exchange mainly occurs within the thermal boundary layer.

[0035] Serrated fins thin or disrupt the thermal boundary layer through disturbance, allowing the main oil flow to make more thorough contact with the wall surface, thereby improving heat exchange efficiency. Specific methods include: ① Physical structural disturbance: The concave and convex structure of the zigzag fins directly obstructs and changes the direction of oil flow. When oil flows through the "protrusions" and "recesses" of the fins, the originally smooth laminar flow along the wall surface is interrupted, forming small-scale eddies and turbulence in the gaps between the fins. This forcibly tears apart the stable thermal boundary layer, disrupts the temperature gradient, and allows the high-temperature oil in the main flow to reach the vicinity of the wall surface more quickly; ② Increasing flow resistance and turbulence... Flow rate: The serrated structure increases the local resistance of the oil flow, forcing the oil flow to change from "stable laminar flow" to "turbulent flow". In the turbulent state, the mixing motion of oil molecules is more intense, which can accelerate the mixing of hot and cold oil and allow the transformer oil to carry away heat more quickly; ③ Reduce the thickness of the boundary layer: When the fins are not installed, the oil flows along the smooth wall surface, and the thermal boundary layer will gradually thicken with the flow distance, resulting in a gradual decrease in heat exchange efficiency; while the spaced distribution of the serrated fins can "restart" the thermal boundary layer at each serration, so that the boundary layer always remains thin, indirectly achieving the "destruction and reset" of the thick boundary layer.

[0036] The first heat dissipation structure (such as a corrugated sheet) in the embodiments of this application is usually located outside the oil tank, mainly serving to dissipate heat and compensate for changes in oil volume. Adding zigzag fins to the smooth inner wall of the oil tank maximizes the utilization of the effective heat dissipation area without occupying excessive space, forming a complementary heat dissipation effect with the external corrugated sheet or other heat dissipation structures. Taking a corrugated oil tank as an example, the corrugated sheet is responsible for absorbing heat from the core area of ​​the oil tank, while the zigzag fins are responsible for quickly dissipating heat from the side without a heat dissipation structure. Although the two are not in the same location and do not directly contact each other, through the linkage mechanism of "core heat absorption → oil heat absorption → edge dissipation," the heat inside the oil tank is no longer limited to heat dissipation on one side, but achieves full-area flow, further improving the overall heat dissipation effect, while adapting to the development needs of transformers becoming increasingly compact.

[0037] It is worth noting that even if the zigzag fins are only located on the inner side of the tank wall and entirely on the side without corrugated fins or other heat dissipation structures, the two can still achieve complementary heat dissipation through "zoned heat dissipation + oil convection circulation." Specifically, this manifests as follows: ① Zoned heat dissipation, each fulfilling its function and covering the entire area: On the corrugated fin side, focusing on the core heat-generating area of ​​the tank, the fins increase the contact area with the high-temperature oil through their own structure, preferentially absorbing a large amount of heat from the oil and quickly transferring it to the tank wall on the same side, completing the process of "high-temperature oil → corrugated fins → tank wall." The first stage of heat conduction avoids heat accumulation in the core area. On the side of the zigzag fins, for the low-temperature edge area without heat dissipation structure, the zigzag structure can form more heat contact points on the inner side of the box wall. On the one hand, it efficiently absorbs the heat of the oil close to the box wall (including the heat transferred from the core area). On the other hand, the three-dimensional structure of the zigzag extends the heat conduction path and quickly transfers the heat to the box wall without heat dissipation structure, completing the second stage of heat conduction from "medium-temperature oil → zigzag fins → box wall" and filling the heat dissipation gap on this side. ② Oil convection circulation and linkage heat transfer to avoid local overheating: The "disturbance effect" of the corrugated fins provides energy to the Z-shaped fins - the corrugated fins disturb the oil in the core area, breaking the laminar flow state and driving the high-temperature oil to flow to the low-temperature Z-shaped fin side, continuously providing the fins with oil to dissipate heat, and preventing the fins from having no heat to dissipate due to contact with low-temperature oil; the "guide effect" of the Z-shaped fins reduces the load on the corrugated fins - the fins guide the oil circulation in the oil tank through the "Z" gap, sending the cooled oil on the fin side back to the core area, forming convection with the high-temperature oil on the corrugated fin side, so that the corrugated fins can continuously contact new high-temperature oil, ensuring efficient heat absorption.

[0038] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present utility model.

Claims

1. A transformer oil tank with an internal heat dissipation structure, characterized in that, The device includes an oil tank and a first heat dissipation structure disposed on the outside of the oil tank. A second heat dissipation structure is provided on the inner wall of the oil tank. The second heat dissipation structure is a serrated fin. The serrated fin includes an edge base end and a serrated end. The serrated end is perpendicular to the edge base end. The edge base end is fixedly connected to the inner wall of the oil tank. The serrated end has a concave-convex structure.

2. The transformer oil tank with an internal heat dissipation structure according to claim 1, characterized in that, The edge base end is fixedly connected to the inner wall of the oil tank by bolts.

3. The transformer oil tank with an internal heat dissipation structure according to claim 1, characterized in that, The edge base end is welded to the inner wall of the oil tank.

4. A transformer oil tank with an internal heat dissipation structure according to claim 1, characterized in that, The serrated fins are arranged along a first direction, which is the natural convection direction of the transformer oil.

5. A transformer oil tank with an internal heat dissipation structure according to claim 1, characterized in that, The number of serrated fins is multiple, and the multiple serrated fins are distributed at intervals along the length direction of the inner sidewall of the oil tank.

6. A transformer oil tank with an internal heat dissipation structure according to claim 1, characterized in that, The serrated fin includes multiple fin units, which are arranged in a staggered manner.

7. A transformer oil tank with an internal heat dissipation structure according to claim 6, characterized in that, The fin units of two adjacent serrated fins are misaligned in the same direction.

8. A transformer oil tank with an internal heat dissipation structure according to claim 1, characterized in that, The first heat dissipation structure is a corrugated sheet.

9. A transformer oil tank with an internal heat dissipation structure according to claim 1, characterized in that, The transformer body is located inside the oil tank.

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