Cooling structure and transformer or reactor

Abstract

The utility model belongs to the technical field of power equipment, and discloses a cooling structure and a transformer or a reactor. The cooling structure comprises an oil return pipe, a cooler, an upper connecting pipe and a lower connecting pipe, the oil return pipe is at least partially arranged at the bottom of the oil tank, an oil outlet is formed in the oil return pipe in the oil tank, and the oil outlet faces a transformer coil in the oil tank; the cooler is located on one side of the oil tank, the upper connecting pipe is communicated with the upper end of the cooler, the lower connecting pipe is communicated with the oil return pipe and the lower end of the cooler, oil in the oil tank flows into the cooler through the upper connecting pipe, and the oil cooled by the cooler flows into the oil return pipe through the lower connecting pipe and flows into the oil tank through the oil outlet. The oil return pipe is additionally arranged, the oil return pipe is provided with the oil outlet, oil enters the oil return pipe through the lower connecting pipe after being cooled by the cooler and then flows into the oil tank from the oil outlet of the oil return pipe, the position of the oil outlet can be set according to needs, the setting position of the cooler is not limited, and the situation that the cooling effect is affected due to the fact that the setting position of the cooler is limited is avoided.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to a cooling structure and a transformer or reactor. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. During operation, a transformer generates heat. If the heat cannot be dissipated in time, the temperature will rise, affecting its working efficiency and service life.

[0003] In existing technologies, coolers are typically used for cooling. Oil enters the cooler from the oil tank outlet through a pipeline, and the cooled oil returns to the oil tank inlet through a pipeline to ensure oil circulation. The cooler is arranged on the outside of the oil tank, and the cooled oil flows into the oil tank from the cooler outlet. To ensure the cooling effect, the cooled oil needs to flow into the oil tank from different locations. However, sometimes due to installation space limitations, the location of the cooler is restricted, and the cooler outlet cannot be arranged as needed, affecting the cooling effect.

[0004] Therefore, there is an urgent need to provide a cooling structure and a transformer or reactor to install an oil return pipe inside the oil tank, guide the cooled oil into the oil return pipe and into the oil tank from the oil outlet. The position of the oil outlet can be set as needed, so that the installation position of the cooler is not restricted, and the cooling effect is not affected by the limited installation position of the cooler. Utility Model Content

[0005] The purpose of this utility model is to provide a cooling structure and a transformer or reactor, in which an oil return pipe is set inside the oil tank to guide the cooled oil into the oil return pipe and into the oil tank from the oil outlet. The position of the oil outlet can be set as needed, so that the installation position of the cooler is not restricted, and the cooling effect is not affected by the limited installation position of the cooler.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a cooling structure, which includes:

[0008] An oil return pipe is provided, at least partially located at the bottom of the oil tank, and an oil outlet is provided on the oil return pipe inside the oil tank.

[0009] A cooler is located on the side of the oil tank;

[0010] The upper connecting pipe is located on the upper part of the outside of the oil tank, and the lower connecting pipe is located on the lower part of the outside of the oil tank. The upper connecting pipe is connected to the upper end of the cooler, and the lower connecting pipe is connected to both the return oil pipe and the lower end of the cooler. The oil in the oil tank flows into the cooler through the upper connecting pipe, and the oil cooled by the cooler flows into the return oil pipe through the lower connecting pipe and then flows into the oil tank from the oil outlet.

[0011] As an optional technical solution for the cooling structure, the oil return pipe extends along the length of the oil tank.

[0012] As an optional technical solution for the cooling structure, at least two return oil pipes are provided at intervals along the width direction of the oil tank.

[0013] As an optional technical solution for the cooling structure, the oil return pipe is provided with multiple sets of oil outlets at even intervals, each set including one or more evenly distributed oil outlets.

[0014] As an optional technical solution for the cooling structure, the oil return pipe and the lower connecting pipe are connected by a sealing structure.

[0015] As an optional technical solution for the cooling structure, the cooling structure also includes a pipe structure, which is fixed to the lower part of the outside of the oil tank. One end of the pipe structure extends into the oil tank and is connected to the return oil pipe, while the other end of the pipe structure is located outside the oil tank and is connected to the lower connecting pipe.

[0016] As an optional technical solution for the cooling structure, the lower connecting pipe is installed and fixed to the lower part of the outside of the oil tank. One end of the lower connecting pipe is connected to the lower end of the cooler, and the other end of the lower connecting pipe extends into the oil tank and is connected to the oil return pipe.

[0017] As an optional technical solution for the cooling structure, the cooling structure also includes a support structure, one end of which is fixed to the upper connecting pipe and the other end of which is fixed to the lower connecting pipe.

[0018] As an optional technical solution for the cooling structure, the lower connecting pipe is L-shaped and includes a first straight pipe and a second straight pipe, as well as a transition bend connecting the first straight pipe and the second straight pipe. The first straight pipe is connected to the lower end of the cooler, and the second straight pipe is connected to the oil return pipe.

[0019] This utility model provides a transformer or reactor, which includes an oil tank and the cooling structure described above.

[0020] Beneficial effects:

[0021] This utility model provides a cooling structure, which includes an oil return pipe, a cooler, an upper connecting pipe, and a lower connecting pipe. The oil return pipe is at least partially located at the bottom of the oil tank, and has an oil outlet. The cooler is located on the side of the oil tank. The upper connecting pipe is located at the upper part of the outer side of the oil tank, and the lower connecting pipe is located at the lower part of the outer side of the oil tank. The upper connecting pipe is connected to the upper end of the cooler, and the lower connecting pipe is connected to both the oil return pipe and the lower end of the cooler. Oil in the oil tank flows into the cooler through the upper connecting pipe, and after being cooled by the cooler, the oil flows into the oil return pipe through the lower connecting pipe and then into the oil tank from the oil outlet. By adding an oil return pipe with an oil outlet, the oil, after being cooled by the cooler, flows into the oil return pipe through the lower connecting pipe and then into the oil tank from the oil outlet of the oil return pipe. The position of the oil outlet can be set as needed, so that the installation position of the cooler is not restricted, avoiding the impact of the cooling effect due to the limited installation position of the cooler.

[0022] This utility model provides a transformer or reactor, which includes an oil tank and the aforementioned cooling structure. By setting a cooling structure with an oil return pipe, the position of the oil outlet on the oil return pipe can be set as needed, so that the setting position of the cooler is not restricted, and the cooling effect is avoided due to the limited setting position of the cooler. Attached Figure Description

[0023] Figure 1 This is a front view of a portion of the cooling structure provided in an embodiment of this utility model;

[0024] Figure 2 This is a top view of a portion of the cooling structure provided in an embodiment of this utility model;

[0025] Figure 3 This is a side view of a portion of the cooling structure provided in an embodiment of this utility model;

[0026] Figure 4 This is an isometric view of a portion of the cooling structure provided in an embodiment of this utility model;

[0027] Figure 5 yes Figure 4 A magnified view of a section at point A in the middle;

[0028] Figure 6 This is a schematic diagram of the oil flow direction of a portion of the cooling structure provided in an embodiment of this utility model.

[0029] In the picture:

[0030] 1. Cooler; 2. Oil tank; 31. Upper connecting pipe; 32. Lower connecting pipe; 321. Adapter bend; 322. First straight pipe; 323. Second straight pipe; 33. Support structure; 34. Pipe structure; 4. Oil return pipe; 41. Oil outlet; 5. Sealing structure; 6. Support frame. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] Large-capacity transformers exhibit strong leakage magnetic fields during operation. These strong leakage magnetic fields inevitably interact with the transformer's metal structural components, inducing significant eddy current losses in the internal clamps and causing localized overheating. This jeopardizes the transformer's safe operation, necessitating cooling. The oil in the transformer tank serves as a heat exchange medium, typically circulating and cooling to remove heat from the oil, thus achieving transformer cooling.

[0036] Large-capacity transformers require a large amount of oil, necessitating a well-designed cooling circuit to maintain oil circulation. Lowering the oil temperature is primarily achieved through coolers. For forced-oil, air-cooled transformers, ensuring oil circulation is crucial, and the cooler outlets must be evenly distributed across the oil tank. However, sometimes installation limitations prevent even distribution at the cooler outlets, leading to poor cooling performance. Furthermore, the transformer coils, being one of the transformer's main heat-generating components, experience slow cooling due to the inability of cooled oil to flow directly to them, further impacting the cooling effect.

[0037] like Figures 1 to 6 As shown, this embodiment provides a cooling structure, which includes an oil return pipe 4, a cooler 1, an upper connecting pipe 31, and a lower connecting pipe 32. The oil return pipe 4 is at least partially located at the bottom of the oil tank 2, and an oil outlet 41 is provided on the oil return pipe 4 inside the oil tank 2. The cooler 1 is located on the side of the oil tank 2. The upper connecting pipe 31 is located at the upper part of the outside of the oil tank 2, and the lower connecting pipe 32 is located at the lower part of the outside of the oil tank 2. The upper connecting pipe 31 is connected to the upper end of the cooler 1, and the lower connecting pipe 32 is connected to both the oil return pipe 4 and the lower end of the cooler 1. The oil in the oil tank 2 flows into the cooler 1 through the upper connecting pipe 31, and the oil cooled by the cooler 1 flows into the oil return pipe 4 through the lower connecting pipe 32 and then flows into the oil tank 2 from the oil outlet 41.

[0038] By adding an oil return pipe 4, an oil outlet 41 is provided on the oil return pipe 4 in the oil tank 2. After the oil is cooled by the cooler 1, it flows into the oil return pipe 4 through the lower connecting pipe 32, and then flows into the oil tank 2 from the oil outlet 41 of the oil return pipe 4. The position of the oil outlet 41 can be set as needed, so that the setting position of the cooler 1 is not restricted, and the cooling effect is not affected by the limited setting position of the cooler 1.

[0039] This embodiment also provides a transformer or reactor, which includes an oil tank 2 and a cooling structure. Not only does the transformer oil tank need cooling, but the reactor oil tank also needs cooling to prevent excessively high oil temperatures from affecting reactor performance or even damaging internal components.

[0040] Optionally, the oil outlet 41 of the return oil pipe 4 is positioned towards the transformer coil or reactor coil inside the oil tank 2. By positioning the oil outlet 41 towards the transformer coil or reactor coil, the cooled oil flows directly from the oil outlet 41 to the coil, promoting coil cooling and effectively improving the cooling effect.

[0041] Specifically, multiple coolers 1 are arranged side-by-side at intervals along the length of the oil tank 2, with all coolers 1 located on one side of the oil tank 2. By arranging coolers 1 on one side of the oil tank 2, it is ensured that the oil can absorb the heat inside the oil tank 2 and dissipate it in a timely manner through the coolers 1, preventing overheating damage to the transformer or reactor. When it is necessary to inspect or replace the coolers 1, they are easily accessible and operable on one side of the oil tank 2, reducing the difficulty and time required for maintenance. In other embodiments, the location and number of coolers 1 can be adjusted according to actual conditions. In this embodiment, the Y direction is the length direction of the oil tank 2, the X direction is the width direction of the oil tank 2, and the Z direction is the height direction of the oil tank 2.

[0042] Furthermore, the cooling structure also includes a support structure 33, one end of which is fixed to the upper connecting pipe 31 and the other end to the lower connecting pipe 32. By setting the support structure 33 to connect the upper connecting pipe 31 and the lower connecting pipe 32 together, the oil flows in the upper connecting pipe 31 and the lower connecting pipe 32 in a predetermined flow direction. This ensures a tight connection between the upper connecting pipe 31 and the lower connecting pipe 32 to prevent oil leakage, and also maintains stable performance over a long period of time in complex environments, reducing the frequency of maintenance and replacement.

[0043] In this embodiment, the upper connecting pipe 31 and the lower connecting pipe 32 are spaced apart along the Z direction; the support structure 33 can be a support rod and / or a support pipe.

[0044] Optionally, the cooling structure further includes a support frame 6, through which the upper connecting pipe 31 and / or the lower connecting pipe 32 are fixed to the cooler 1. The support frame 6 helps ensure the stability of the connection between the upper connecting pipe 31 and the lower connecting pipe 32 and the cooler 1. In this embodiment, multiple support frames 6 are provided, with one support frame 6 at each of the four corners of each cooler 1. The upper connecting pipe 31 is fixed to the support frame 6 located at the upper end of the cooler 1, and the lower connecting pipe 32 is fixed to the support frame 6 located at the lower end of the cooler 1.

[0045] Optionally, the return oil pipe 4 and the lower connecting pipe 32 are connected by a sealing structure 5. By setting the sealing structure 5 to assist in the connection between the return oil pipe 4 and the lower connecting pipe 32, a reliable seal at the connection can be ensured; the sealing structure 5 can be a two-way flange sealing structure.

[0046] Optionally, the lower connecting pipe 32 is installed and fixed to the lower part of the outside of the oil tank 2. One end of the lower connecting pipe 32 is connected to the lower end of the cooler 1, and the other end of the lower connecting pipe 32 extends into the oil tank 2 and is connected to the return oil pipe 4. By installing and fixing the lower connecting pipe 32 on the oil tank 2, with the end of the lower connecting pipe 32 extending into the oil tank 2, it can be connected to the return oil pipe 4. It is understood that the return oil pipe 4 can also be installed and fixed on the oil tank 2, with one end of the return oil pipe 4 extending straight out of the oil tank 2 and connected to the lower connecting pipe 32.

[0047] Optionally, the cooling structure also includes a pipe structure 34, which is fixed to the lower part of the outside of the oil tank 2. One end of the pipe structure 34 extends into the oil tank 2 and is connected to the return oil pipe 4, while the other end of the pipe structure 34 is located outside the oil tank 2 and is connected to the lower connecting pipe 32. By fixing the pipe structure 34 to the oil tank 2 and connecting the return oil pipe 4 and the lower connecting pipe 32 through the pipe structure 34, installation and maintenance are convenient, and it helps to ensure the sealing of the connection and prevent oil leakage at the connection between the oil tank 2 and the pipeline.

[0048] In this embodiment, one end of the pipe structure 34 is located inside the oil tank 2 and can be sealed and connected to the return oil pipe 4, while the other end of the pipe structure 34 is located outside the oil tank 2 and is connected to the lower connecting pipe 32 through the sealing structure 5.

[0049] Furthermore, the lower connecting pipe 32 is L-shaped and includes a first straight pipe 322, a second straight pipe 323, and a connecting bend 321 connecting the first straight pipe 322 and the second straight pipe 323. The first straight pipe 322 is connected to the lower end of the cooler 1, and the second straight pipe 323 is connected to the return oil pipe 4. In this embodiment, the first straight pipe 322 extends along the Y direction, and the second straight pipe 323 extends along the X direction; the second straight pipe 323 is connected to the return oil pipe 4 through the sealing structure 5 and the pipe structure 34. After being cooled by the cooler 1, the oil flows sequentially into the first straight pipe 322, the connecting bend 321, and the second straight pipe 323, and then flows into the return oil pipe 4 from the pipe structure 34, thereby flowing into the oil tank 2; when the oil flows out from the oil outlet 41 of the return oil pipe 4, it can flow directly into the transformer coil or reactor coil in the oil tank 2.

[0050] In this embodiment, the first straight pipe 322 is fixedly connected to the lower part of the outside of the oil tank 2, and the second straight pipe 323 is fixed to the lower part of the outside of the oil tank 2 through the sealing structure 5 and the pipe structure 34. Both ends of the sealing structure 5 are fixed to the second straight pipe 323 and the pipe structure 34 by flanges, that is, by connecting the two flanges together and tightening them with bolts, a good strength and tightness can be achieved. By setting the first straight pipe 322 and the second straight pipe 323 to be fixed to the oil tank 2, and fixing the cooler 1 to the lower connecting pipe 32 through the support frame 6, the stability of the installation of the lower connecting pipe 32 and the cooler 1 is helped to ensure.

[0051] Optionally, the return oil pipe 4 extends along the length of the oil tank 2; at least two return oil pipes 4 are spaced apart along the width of the oil tank 2; multiple sets of oil outlets 41 are evenly spaced on the return oil pipe 4, each set including one or more evenly distributed oil outlets 41. By providing a return oil pipe 4 extending along the length of the oil tank 2 and opening oil outlets 41 at different positions on the return oil pipe 4, the cooled oil can be diverted and flow to multiple transformer coils or reactor coils; by providing at least two return oil pipes 4 spaced apart along the width of the oil tank 2, the cooled oil can flow to the transformer coils or reactor coils from different positions.

[0052] In this embodiment, taking a transformer as an example, the transformer is a three-phase transformer. The oil return pipe 4 extends along the Y direction and is arranged in parallel at intervals along the X direction. Each oil return pipe 4 is provided with three sets of oil outlets 41 at intervals along the Y direction. The three sets of oil outlets 41 correspond to the three-phase coils of the transformer respectively.

[0053] Optionally, each group includes four oil outlets 41 evenly spaced along the Y direction; the oil outlets 41 are circular holes. By setting the four oil outlets 41 of each group evenly spaced, the oil can be evenly distributed in the oil tank 2 after recirculation, which helps to improve the cooling effect.

[0054] The cooling structure provided in this embodiment fixes the cooler 1 through the oil tank 2, the upper connecting pipe 31, and the lower connecting pipe 32; and forms an oil circuit through the arrangement and position of the upper connecting pipe 31 and the lower connecting pipe 32; by arranging the return oil pipe 4 near the bottom of the oil tank 2, the oil is evenly distributed at the bottom of the tank 2 body to cool the oil, which can avoid the limitation of the cooler 1's installation position and ensure the safe operation of the transformer or reactor.

[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A cooling structure, characterized in that, include: Oil return pipe (4), which is at least partially located at the bottom of the oil tank (2), and an oil outlet (41) is provided on the oil return pipe (4) in the oil tank (2); A cooler (1) is located on the side of the oil tank (2); The upper connecting pipe (31) and the lower connecting pipe (32) are provided. The upper connecting pipe (31) is located on the upper part of the outside of the oil tank (2), and the lower connecting pipe (32) is located on the lower part of the outside of the oil tank (2). The upper connecting pipe (31) is connected to the upper end of the cooler (1), and the lower connecting pipe (32) is connected to both the return oil pipe (4) and the lower end of the cooler (1). The oil in the oil tank (2) flows into the cooler (1) through the upper connecting pipe (31), and the oil cooled by the cooler (1) flows into the return oil pipe (4) through the lower connecting pipe (32) and into the oil tank (2) from the oil outlet (41).

2. The cooling structure according to claim 1, characterized in that, The return oil pipe (4) extends along the length of the oil tank (2).

3. The cooling structure according to claim 2, characterized in that, At least two return oil pipes (4) are provided at intervals along the width direction of the oil tank (2).

4. The cooling structure according to claim 1, characterized in that, The return oil pipe (4) is provided with multiple sets of oil outlets (41) at even intervals, each set including one or more evenly distributed oil outlets (41).

5. The cooling structure according to claim 1, characterized in that, The return oil pipe (4) is connected to the lower connecting pipe (32) through a sealing structure (5).

6. The cooling structure according to claim 1, characterized in that, The cooling structure also includes a pipe structure (34), which is fixed to the lower part of the outside of the oil tank (2). One end of the pipe structure (34) extends into the oil tank (2) and is connected to the return oil pipe (4). The other end of the pipe structure (34) is located outside the oil tank (2) and is connected to the lower connecting pipe (32).

7. The cooling structure according to claim 1, characterized in that, The lower connecting pipe (32) is fixed to the lower part of the outside of the oil tank (2). One end of the lower connecting pipe (32) is connected to the lower end of the cooler (1), and the other end of the lower connecting pipe (32) extends into the oil tank (2) and is connected to the return oil pipe (4).

8. The cooling structure according to any one of claims 1-6, characterized in that, The cooling structure also includes a support structure (33), one end of which is fixed to the upper connecting pipe (31) and the other end of which is fixed to the lower connecting pipe (32).

9. The cooling structure according to any one of claims 1-6, characterized in that, The lower connecting pipe (32) is L-shaped and includes a first straight pipe (322) and a second straight pipe (323), as well as a transition bend (321) connecting the first straight pipe (322) and the second straight pipe (323). The first straight pipe (322) is connected to the lower end of the cooler (1), and the second straight pipe (323) is connected to the oil return pipe (4).

10. A transformer or reactor, characterized in that, It includes an oil tank (2) and a cooling structure as described in any one of claims 1-9.

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