Oil flow guide structure, cooling device and transformer coil

Abstract

The invention relates to an oil flow guide structure, a cooling device and a transformer coil, and is applied to the field of oil-immersed transformers. The oil guide assembly comprises a plurality of oil guide supporting strips, and the oil guide supporting strips can extend in the first direction and are attached to at least one side wall of a coil of the transformer; an oil guide cavity is formed in the oil guide supporting strip, an oil inlet used for inputting cooled insulating oil is formed in the oil inlet end of the oil guide supporting strip, an oil outlet is formed in the side, close to the closed end, of the surface of the oil guide supporting strip, and the oil outlet is used for conveying oil in the oil guide cavity to an upper coil of a transformer coil. According to the cooling device, the semiconductor chilling plate is used for generating cooled insulating oil, the cooled insulating oil is input into the oil guide cavity from the oil inlet and conveyed to the hot spot area of the upper coil of the transformer through the oil outlet communicated with the oil guide cavity, the cooled insulating oil is mixed with oil flow flowing in the upper coil, and therefore the average temperature of the oil flow is reduced, and the cooling efficiency is improved. Meanwhile, the oil flow is increased, and the heat dissipation capacity of the hot spot area of the upper coil of the coil is enhanced.

Description

Technical Field

[0001] This application relates to the technical field of oil-immersed transformers, and in particular to an oil flow guiding structure, a cooling device, and a transformer coil. Background Technology

[0002] With economic development, the demand for transformer capacity is increasing, which brings a series of technical challenges, especially in terms of coil heat loss and temperature rise control in the hottest areas of the coil. As the temperature of the transformer coil rises, the insulation life, insulation oil performance stability, and operational safety of the transformer coil will all be affected to some extent.

[0003] In related technologies, the coils of oil-immersed transformers are cooled by insulating oil. When the insulating oil flows through the insulating oil channel, it exchanges heat with the transformer coils, carrying away the heat from the transformer coils to achieve cooling and heat dissipation.

[0004] However, in the existing oil circuit structure, the insulating oil flows through the entire coil, causing the oil in the upper part of the coil to be heated by the lower part, and the oil temperature has risen. This not only affects the heat dissipation of the upper coil, but also makes the wire heating caused by the leakage magnetic field in the upper coil more serious, which seriously affects the insulation life and operational safety of the coil. Summary of the Invention

[0005] Therefore, it is necessary to provide an oil flow guiding structure, a cooling device, and a transformer coil to address the problem that in the existing oil circuit structure, the insulating oil flows through the entire coil, causing the insulating oil in the upper part of the coil to be heated by the lower part, resulting in an increased oil temperature that affects the heat dissipation, insulation life, and operational safety of the upper coil.

[0006] In a first aspect, this application provides an oil flow guiding structure, which adopts the following technical solution:

[0007] An oil flow guiding structure is disclosed for supplying cooling insulating oil to the coil of a transformer. The oil flow guiding structure includes a plurality of oil guiding supports, which extend along a first direction and are attached to at least one side wall of the transformer coil. Each oil guiding support has an oil guiding cavity. Along the first direction, each oil guiding support includes an oil inlet end and a closed end arranged opposite to each other. The oil inlet end has an oil inlet port for inputting the cooled insulating oil into the oil guiding cavity. The closed end is constructed as a closed structure. An oil outlet is provided on the surface of the oil guiding support near the closed end, and the oil outlet is used to transport the oil in the oil guiding cavity to the upper region of the transformer coil.

[0008] In one embodiment, the oil outlets are provided in multiple locations, all of which are located on the side of the oil guide bar near the closed end, and all the oil outlets are arranged in an array.

[0009] Secondly, this application provides a cooling device, which adopts the following technical solution:

[0010] A cooling device includes a heat exchange structure and the aforementioned oil flow guiding structure. The heat exchange structure is installed inside an oil tank filled with insulating oil and is used to cool the insulating oil. The oil flow guiding structure is installed inside the oil tank and is connected to the heat exchange structure.

[0011] In one embodiment, the heat exchange structure includes a shell, a partition, and a cooling component. The partition is disposed inside the shell and divides the internal space of the shell into an external heat release chamber and an internal heat absorption chamber. The cooling component is installed on the partition to absorb heat in the internal heat absorption chamber and release it to the external heat release chamber.

[0012] In one embodiment, the cooling device includes a DC power socket and a plurality of thermoelectric coolers connected in series with the DC power socket. The DC power socket is used to connect to a DC power source. The side of the thermoelectric cooler facing the external heat dissipation chamber is a heat dissipation surface, and the side facing the internal heat absorption chamber is a heat absorption surface. When the thermoelectric cooler is powered on, it can transfer the heat absorbed by the heat absorption surface to the heat dissipation surface.

[0013] In one embodiment, the heat exchange structure further includes a first oil inlet pump, a second oil inlet pump, a cold oil outlet pipe, and a hot oil outlet pipe installed on the housing; wherein, the first oil inlet pump is used to pump the insulating oil in the oil tank to the internal heat absorption chamber, and the cold oil outlet pipe connects the internal heat absorption chamber to the oil flow guiding structure; the second oil inlet pump is used to pump the insulating oil in the oil tank to the external heat release chamber, and the hot oil outlet pipe is used to transport the insulating oil in the external heat release chamber to the upper part of the oil tank.

[0014] Thirdly, this application provides a transformer coil, which adopts the following technical solution:

[0015] A transformer coil includes a coil structure, a cooling device, and an oil guiding structure. The coil structure includes an inner paper tube, an inner insulating support strip, a coil, an outer insulating support strip, and an outer paper tube, which are sequentially nested from the inside out. At least one of the inner insulating support strip and the outer insulating support strip is the oil guiding support strip. The oil guiding structure is disposed inside the coil and forms an oil channel between the inner paper tube and the outer paper tube, and the oil channel is used to transport insulating oil.

[0016] In one embodiment, the insulating outer support strips are provided in multiples and are arranged at intervals along the circumference of the outer paper tube.

[0017] In one embodiment, the insulating inner support strips are provided in multiples and are arranged at circumferential intervals along the inner paper tube.

[0018] In one embodiment, the oil guiding structure includes multiple oil baffles passing through the coil, with adjacent oil baffles arranged alternately on the left and right sides. One oil baffle is connected to the inner paper tube, and the other oil baffle is correspondingly connected to the outer paper tube. The oil channel is formed between the inner paper tube, the outer paper tube, and the oil baffles, and the oil channel is arranged in an "S" shape.

[0019] The aforementioned oil flow guiding structure introduces cooled insulating oil into the oil guiding cavity from the oil inlet and delivers it to the "hot spot" area of ​​the upper coil of the transformer through the oil outlet connected to the oil guiding cavity. This allows the cooled insulating oil to mix with the oil flow in the upper coil, thereby reducing the average temperature of the oil flow and increasing the oil flow rate. This also increases the heat dissipation capacity of the "hot spot" area of ​​the coil in the hottest part of the upper coil, thus achieving the effect of reducing the "hot spot" of the coil. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the oil guide bar in one embodiment of this application.

[0021] Figure 2 This is a schematic diagram of the cooling device in one embodiment of this application.

[0022] Figure 3 This is a top view of the coil structure in one embodiment of this application.

[0023] Figure 4 for Figure 3 A schematic diagram of the coil oil flow at section AA.

[0024] Figure 5 For cooling devices and Figure 3 A schematic diagram of the coil oil flow at section BB.

[0025] Attached image annotations:

[0026] 1. Oil guide support bar; 11. Oil guide cavity; 12. Oil inlet; 13. Oil outlet; 2. Heat exchange structure; 21. Shell; 22. Partition plate; 23. Refrigeration component; 231. DC power socket; 232. Semiconductor cooling chip; 24. First oil inlet pump; 25. Second oil inlet pump; 26. Cold oil output pipe; 27. Hot oil output pipe; 3. Coil structure; 31. Inner paper tube; 32. Insulating inner support bar; 33. Coil; 331. Wire disc; 34. Insulating outer support bar; 35. Outer paper tube; 4. Oil baffle plate; 6. "S" shaped oil channel; 7. External heat dissipation chamber; 8. Internal heat absorption chamber; F1. First direction. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. Where applicable, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation. "First direction" is defined as the direction along the line connecting the bottom end of the transformer coil to the top end of the transformer coil.

[0033] With economic development, the demand for transformer capacity is increasing. As transformer capacity increases, the difficulty of controlling coil heat loss and temperature rise in the hottest areas of the coil gradually increases. To ensure the insulation life, insulating oil performance stability, and operational safety of large-capacity transformer coils, relevant regulations stipulate that the temperature rise limit for coil hot spots is 78K, and the temperature rise limit for internal structural components of the transformer is 75K.

[0034] Specifically, oil-immersed transformers use Class A insulation, with 105℃ as the allowable average operating temperature. Within the range of 80 to 140℃, the insulation aging rate doubles for every 6K increase in temperature. The coils of oil-immersed transformers are cooled by insulating oil. As the insulating oil flows through the insulating oil channels, it exchanges heat with the transformer coils, carrying away the heat from the coils.

[0035] However, in the existing oil circuit structure, the insulating oil flows through the entire coil, causing the oil in the upper part of the coil to be heated by the lower part, resulting in an increased oil temperature. This not only affects the heat dissipation of the upper coil, but also exacerbates the heating of the conductors caused by the leakage magnetic field in the upper coil, seriously affecting the insulation life and operational safety of the coil. Therefore, the upper coil of a large-capacity transformer is the area with the highest temperature in the entire coil (referred to as the coil "hot spot" in the transformer industry).

[0036] The formula for calculating the temperature rise of the coil "hot spot" is:

[0037] Coil hot spot temperature rise = Top layer oil temperature rise + 1.3 × Coil copper oil temperature rise

[0038] The temperature rise limit for the coil hot spot is 78K, the temperature rise limit for the top layer oil is 55K, and the temperature rise limit for the coil copper oil is 25K.

[0039] In the actual design process of large-capacity transformers, even when the temperature rise of the coil copper oil is slightly below the limit, the temperature rise of the coil "hot spots" far exceeds the limit. In order to ensure that the temperature rise of the coil "hot spots" is below the limit, the cross-sectional area of ​​the conductors inside the coil is often increased, resulting in an excessively large average temperature rise margin for the coil and an increase in material costs.

[0040] How to enhance the heat dissipation capacity of the "hot spot" area, thereby reducing the difference between the temperature rise of the coil's "hot spot" and the average temperature rise of the coil, improving the economic efficiency of large-capacity transformer design, and at the same time ensuring the insulation life and operational safety of the large-capacity transformer coil, is a key issue that urgently needs to be addressed by those skilled in the art.

[0041] The following is in conjunction with the appendix Figure 1-5 The embodiments of this application will be described in further detail.

[0042] See Figure 1 , Figure 1 The diagram shows a schematic of the structure of an oil guide bar in one embodiment of this application. One embodiment of this application provides an oil flow guiding structure for delivering cooling insulating oil to the coil 33 of a transformer, especially to the upper part of the transformer coil 33, so as to achieve point cooling operation of the "hot spot" area of ​​the transformer coil 33, thereby enhancing the heat dissipation capacity of the "hot spot" area of ​​the transformer, reducing the difference between the temperature rise of the "hot spot" of the coil 33 and the average temperature rise of the coil 33, improving the economic efficiency of the design of large-capacity transformers, and ensuring the insulation life and operational safety of the large-capacity transformer coil 33 at the same time.

[0043] Specifically, the oil flow guiding structure includes multiple spaced oil guide bars 1. Each oil guide bar 1 extends along the first direction F1 and adheres to at least one side wall of the inner or outer wall of the transformer coil 33, thereby shortening the oil flow path. The oil guide bar 1 is constructed as a hollow structure, with an oil guide cavity 11 inside for transmitting insulating oil. Along the first direction F1, the oil guide bar 1 includes an oil inlet end and a closed end arranged opposite to each other, with the closed end being closer to the "hot spot" area of ​​the transformer coil 33 than the oil inlet end.

[0044] In this embodiment, the oil inlet end of the oil guide bar 1 is provided with an oil inlet 12 for inputting cooled insulating oil into the oil guide cavity 11, the closed end is constructed as a closed structure, and an oil outlet 13 is provided on the side wall between the oil inlet end and the closed end. In the first direction F1, the oil outlet 13 is arranged on the side close to the closed end.

[0045] During the cooling operation, the cooled insulating oil flows in from the oil inlet 12 at the oil inlet end and is transmitted along the oil guide cavity 11 to the closed end side. Finally, it flows out from the oil outlet 13 on the upper side wall of the oil guide support bar 1, so that the cooled insulating oil mixes with the oil flow in the upper coil 33 to achieve directional cold oil delivery to the "hot spot" area of ​​the transformer coil 33, thereby reducing the average temperature of the oil flow and increasing the oil flow rate, which in turn increases the heat dissipation capacity of the hottest area of ​​the upper coil 33.

[0046] In some other embodiments, multiple oil outlets 13 are arranged on the same oil guide support 1, and all of them are located on the side wall of the oil guide support 1 near the closed end. The oil outlets 13 are arranged in an array to obtain a better and more uniform cooling effect.

[0047] Combination Figure 1 and Figure 2 As shown, Figure 2 A schematic diagram of a transformer cooling device is shown in one embodiment of this application. In some embodiments, this application also provides a cooling device for insulating oil. The cooling device includes a heat exchange structure 2 for cooling insulating oil and an oil flow guiding structure as shown in any of the above embodiments. The oil guide bar 1 of the oil flow guiding structure is connected to the heat exchange structure 2. Both the heat exchange structure 2 and the oil flow guiding structure are installed in an oil tank (not shown) filled with insulating oil.

[0048] During the cooling operation, the heat exchange structure 2 takes out a portion of the insulating oil from the oil tank for cooling. The cooled insulating oil is then transported to the "hot spot" area of ​​the coil 33 through the oil flow guide structure, so as to realize the fixed-point and directional cold oil delivery operation to the "hot spot" area of ​​the transformer coil 33.

[0049] In some embodiments, the heat exchange structure 2 includes a housing 21, a partition 22, and a cooling component 23. The partition 22 is installed inside the housing 21 and divides the internal space of the housing 21 into an external heat release chamber 7 and an internal heat absorption chamber 8. The cooling component 23 is installed on the partition 22 to absorb heat in the internal heat absorption chamber 8 and release it to the external heat release chamber 7, thereby enabling heat exchange between the insulating oil flowing through the external heat release chamber 7 and the internal heat release chamber, thus obtaining one path of "cold oil" and one path of "hot oil".

[0050] Specifically, the cooling component 23 includes a DC power socket 231 and multiple semiconductor cooling chips 232. The DC power socket 231 is installed outside the housing 21 and is used to connect to an external DC power source. The semiconductor cooling chips 232 are all connected in series to the DC power socket 231 and installed on the mounting holes of the partition 22.

[0051] In this embodiment, the side of the thermoelectric cooler 232 facing the external heat dissipation chamber 7 is the heat dissipation surface, and the side facing the internal heat absorption chamber 8 is the heat absorption surface. Specifically, the thermoelectric cooler 232 is a thermocouple formed by connecting an N-type semiconductor material and a P-type semiconductor material. When direct current passes through the thermocouple, heat transfer occurs between the two ends of the thermocouple, transferring heat from one end to the other, thus achieving the purpose of cooling.

[0052] The semiconductor refrigeration chip 232 is a simple solid-state component that requires no refrigerant, can operate continuously, and operates without vibration or noise. It has a long lifespan and is easy to install. The refrigeration element 23, composed of semiconductor refrigeration chips 232, can achieve a cooling power of several thousand to tens of thousands of watts, producing insulating oil at even lower temperatures.

[0053] When the DC power socket 231 is connected to an external DC power source, the DC power passes through the semiconductor cooling chip 232, and the heat is transferred from the heat-absorbing surface of the semiconductor cooling chip 232 in the internal heat-absorbing chamber 8 to the heat-releasing surface of the semiconductor cooling chip 232 in the external heat-releasing chamber 7. This application utilizes the Peltier effect of semiconductor materials to transfer the heat of the insulating oil from one oil path to another, so that the insulating oil flowing through the external heat-releasing chamber 7 is heated and the insulating oil flowing through the internal heat-absorbing chamber 8 is cooled, thereby generating one path of "cold oil" and one path of "hot oil".

[0054] Continue reading Figure 2 As shown, in some embodiments, the heat exchange structure 2 further includes a first oil inlet pump 24, a second oil inlet pump 25, a cold oil output pipe 26, and a hot oil output pipe 27 installed on the housing 21.

[0055] Specifically, the first oil inlet pump 24 is used to pump the insulating oil at the bottom of the oil tank to the internal heat absorption chamber 8. The cold oil output pipe 26 connects the internal heat absorption chamber 8 to the oil inlet 12 of the oil guide support bar 1 in the oil flow guide structure, thereby delivering the cooled "cold oil" to the "hot spot" area of ​​the coil 33 for fixed-point cooling operation.

[0056] The second oil inlet pump 25 is used to pump the insulating oil from the bottom of the oil tank to the external heat dissipation chamber 7, and the hot oil output pipe 27 is used to transport the insulating oil in the external heat dissipation chamber 7 back to the top of the oil tank. The second oil inlet pump 25 is located at the bottom of the oil tank, and the hot oil output pipe 27 extends to the top of the oil tank, so that the hot oil flows to the top of the oil tank and enters the radiator.

[0057] In this embodiment, the first oil inlet pump 24 and the second oil inlet pump 25 are both common oil pumps, the cold oil output pipe 26 is an insulated heat-insulating pipe, and the hot oil output pipe 27 is an insulated pipe.

[0058] Combination Figures 1 to 5As shown, in some embodiments, this application also provides a transformer coil, which includes a coil structure 3, a cooling device as shown in any of the above embodiments, and an oil guiding structure, wherein the oil guiding structure is installed on the coil structure 3, and the cooling device is installed on the lower part of the coil structure 3 to realize the cooling operation of the coil structure 3.

[0059] For details, please refer to [link / reference]. Figure 3 As shown, Figure 3 The diagram shows a top view of a coil structure according to one embodiment of the present application. In some embodiments, the coil structure 3 includes an inner paper tube 31, an inner insulating support strip 32, a coil 33, an outer insulating support strip 34, and an outer paper tube 35 arranged sequentially from the inside out. The coil 33 and the outer paper tube 35 are sequentially sleeved around the outer periphery of the inner paper tube 31 and are concentrically arranged with each other. The inner insulating support strip 32 passes through the inner paper tube 31 and the coil 33, and the outer insulating support strip 34 passes through the outer paper tube 35 and the coil 33.

[0060] At least one of the inner insulating support bar 32 and the outer insulating support bar 34 can be replaced by the oil guiding support bar 1 described above, thereby realizing the integrated design of the inner insulating support bar 32 and / or the outer insulating support bar 34 with the oil guiding support bar 1, so as to reduce the volume occupied by the cooling device in the coil structure 3.

[0061] In some other embodiments, multiple outer insulating support strips 34 are provided, all of which are evenly distributed along the circumference of the outer paper tube 35; multiple inner insulating support strips 32 are also provided, all of which are evenly distributed along the circumference of the inner paper tube 31. Furthermore, along the radial direction of the transformer coil 33, the inner insulating support strips 32 are arranged in a one-to-one correspondence. In this embodiment, by arranging multiple oil guiding support strips 1 between the inner paper tube 31 and the coil 33, and between the outer paper tube 35 and the coil 33, the output of cold oil to the upper "hot spot" area of ​​the transformer per unit time is effectively increased, thereby further improving the cooling effect on the "hot spot" area.

[0062] For details, please refer to [link / reference]. Figure 4 As shown, Figure 4 It shows Figure 3 A schematic diagram of the coil oil flow at section AA. In some embodiments, the transformer coil 33 includes a plurality of coils 331 arranged sequentially along a first direction F1. The oil guiding structure includes a plurality of oil baffles 4 passing through the coils 331. Adjacent oil baffles 4 are alternately arranged on the left and right sides and are respectively installed on the outer wall of the inner paper tube 31 and the inner wall of the outer paper tube 35. An oil channel for transporting insulating oil to the transformer coil 33 is formed between the inner paper tube 31, the outer paper tube 35 and the oil baffles 4. In this embodiment, the oil channel is constructed in an "S" shape.

[0063] During the cooling operation, the insulating oil in coil 33 is heated, its density decreases, and it flows upward, carrying away the heat generated by coil 331. For example... Figure 4 As indicated by the middle arrow, insulating oil flows in from the bottom of coil 33 and flows out from the top of coil 33. In coil 33 and coil 331, insulating oil flows from bottom to top to form the aforementioned “S”-shaped oil channel 6.

[0064] Combination Figure 5 As shown, Figure 5 A cooling device and a cooling apparatus are shown in one embodiment of this application. Figure 3 A schematic diagram of the coil oil flow at section BB. In some embodiments, the outer insulating support bar 34 and the inner insulating support bar are both replaced by oil guide bars 1. The insulating oil cooling device generates one "cold oil" and one "hot oil" path inside the oil tank using the heat exchange structure 2. The "hot oil" flows to the upper part of the oil tank through the hot oil output pipe 27, and the "cold oil" path is transported to the "hot spot" area on the upper part of the coil 33 through the cold oil output pipe 26, the outer insulating support bar 34 and the inner insulating support bar.

[0065] The lower part of the oil guide bar 1 is a hollow oil inlet 12, and the upper part of the oil guide bar 1 is provided with several oil outlets 13. The top of the bar is closed, and the side facing the coil 331 has an opening. "Cold oil" flows from the oil guide bar 1 into the oil channel between the coils 331, and mixes with the oil flowing from bottom to top in the coil 331 to form an S-shaped oil flow, which reduces the average temperature of the oil flow and increases the oil flow rate. This increases the heat dissipation capacity of the hottest area of ​​the coil 33 at the top of the coil 33, thus reducing the "hot spot" of the coil 33.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An oil flow guiding structure for supplying cooling insulating oil to the coils of a transformer, characterized in that, The oil flow guiding structure includes a plurality of oil guiding supports, which can extend along a first direction and fit against at least one side wall of the transformer coil; The oil guide bar has an oil guiding cavity inside. Along the first direction, the oil guide bar includes an oil inlet end and a closed end arranged opposite to each other. The oil inlet end has an oil inlet for inputting cooled insulating oil into the oil guiding cavity. The closed end is constructed as a closed structure. The oil guide bar surface near the closed end has an oil outlet for transporting the oil in the oil guiding cavity to the upper region of the transformer coil.

2. The oil flow guiding structure according to claim 1, characterized in that, The oil outlets are provided in multiple locations, all of which are located on the side of the oil guide bar near the closed end, and all of the oil outlets are arranged in an array.

3. A cooling device for insulating oil, characterized in that, The cooling device includes: A heat exchange structure, installed inside an oil tank filled with insulating oil, is used to cool the insulating oil; and The oil flow guiding structure as described in any one of claims 1-2 is installed inside the oil tank and connected to the heat exchange structure.

4. The cooling device according to claim 3, characterized in that, The heat exchange structure includes a shell, a partition, and a cooling component. The partition is disposed inside the shell and divides the internal space of the shell into an external heat release chamber and an internal heat absorption chamber. The cooling component is installed on the partition to absorb heat in the internal heat absorption chamber and release it to the external heat release chamber.

5. The cooling device according to claim 4, characterized in that, The cooling device includes a DC power socket and a plurality of semiconductor cooling chips connected in series with the DC power socket. The DC power socket is used to connect to a DC power source. The side of the semiconductor cooling chip facing the external heat dissipation chamber is the heat dissipation surface, and the side facing the internal heat absorption chamber is the heat absorption surface. When the semiconductor cooling chip is powered on, it can transfer the heat absorbed by the heat absorption surface to the heat dissipation surface.

6. The cooling device according to claim 4, characterized in that, The heat exchange structure also includes a first oil inlet pump, a second oil inlet pump, a cold oil output pipe, and a hot oil output pipe installed in the housing; The first oil inlet pump is used to pump the insulating oil in the oil tank to the internal heat absorption chamber, and the cold oil output pipe connects the internal heat absorption chamber to the oil flow guiding structure; the second oil inlet pump is used to pump the insulating oil in the oil tank to the external heat release chamber, and the hot oil output pipe is used to transport the insulating oil in the external heat release chamber to the upper part of the oil tank.

7. A transformer coil, characterized in that, include: The coil structure includes an inner paper tube, an inner insulating support strip, a coil, an outer insulating support strip, and an outer paper tube, which are sequentially nested from the inside out. The cooling device according to any one of claims 4-6, wherein at least one of the inner insulating support strip and the outer insulating support strip is the oil guide support strip; as well as An oil-conducting structure is provided inside the coil and forms an oil channel between the inner paper tube and the outer paper tube, the oil channel being used to transport insulating oil.

8. The transformer coil according to claim 7, characterized in that, The insulating outer support strips are configured in multiple parts and are arranged at intervals along the circumference of the outer paper tube.

9. The transformer coil according to claim 7, characterized in that, The insulating inner support strips are configured in multiple parts and are arranged at intervals along the circumference of the inner paper tube.

10. The transformer coil according to claim 7, characterized in that, The oil guiding structure includes multiple oil baffles passing through the coil, with adjacent oil baffles arranged alternately on the left and right. One oil baffle is connected to the inner paper tube, and the other oil baffle is connected to the outer paper tube. The oil channel is formed between the inner paper tube, the outer paper tube, and the oil baffles, and the oil channel is arranged in an "S" shape.

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