Oil-immersed power transformer fin structure

Abstract

The utility model discloses an oil -immersed power transformer fin structure belongs to transformer technical field, including the power transformer shell for protecting the transformer equipment, the side surface intercommunication of power transformer shell has the air inlet frame, the inside welding of air inlet frame has the fixed frame for supporting, the inside rotation of fixed frame installs the limit tube, the periphery of limit tube leans and is installed a plurality of heat dissipation fins for with air contact, a plurality of heat dissipation fin's surface all is provided with a plurality of heat dissipation holes for ventilation, the side surface mounting of fixed frame has drive motor, the output shaft of drive motor is connected with the driving gear disc through the shaft coupling, the periphery welding of limit tube has the support frame, and this oil -immersed power transformer fin structure can promote the rotation of heat dissipation fin power, and the part surface is fully with air convection, prevents forming thermal resistance, and promotes the heat dissipation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of transformer technology, and in particular to a heat sink structure for an oil-immersed power transformer. Background Technology

[0002] During operation, large and medium-sized transformers generate losses in their internal windings and low-voltage leads, which are converted into heat. This heat is transferred to the surrounding medium through heat conduction in the transformer oil and heat convection, causing the temperature of the core, windings, and tank walls to rise continuously. Higher temperatures accelerate the aging of transformer insulation, severely impacting the transformer's lifespan. Fixed heat dissipation fins cannot actively adjust their contact angle with the air, making it difficult to adapt to complex airflow changes. Under natural convection conditions, airflow direction is random; if the fins cannot rotate, insufficient convection between some surfaces and the air will occur, creating thermal resistance and reducing heat dissipation efficiency.

[0003] A search of Chinese patent documents (authorization announcement number CN222619523U) reveals that this utility model relates to the field of transformer technology, and more particularly to a heat sink structure for an oil-immersed power transformer. Each set of reinforcing components has one end fixedly connected to the outer wall of the tank, and the other end passing through the gap between the heat sink fins and fitting snugly against the outer side of the heat sink fins facing away from the tank. This design can more effectively promote the convection of transformer oil, improving heat exchange efficiency. It also helps to evenly distribute the oil flow, avoiding localized overheating. It significantly improves the structural strength of the heat sink assembly, possessing good safety and adaptability. This device can meet basic usage requirements. However, the fixed heat sink fins cannot actively adjust their contact angle with the air, making it difficult to adapt to complex environmental airflow changes. Under natural convection conditions, the airflow direction is random; if the fins cannot rotate, insufficient convection between some surfaces and the air will occur, creating thermal resistance and reducing heat dissipation efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a heat sink structure for an oil-immersed power transformer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an oil-immersed power transformer heat sink structure, including a power transformer housing for protecting the transformer equipment, wherein an air inlet frame is connected to the side of the power transformer housing; The air intake frame has a fixed frame welded inside for support. A limit tube is rotatably installed inside the fixed frame. Multiple heat dissipation fins for contact with air are installed obliquely on the outer periphery of the limit tube. Multiple heat dissipation holes for ventilation are provided on the surface of the multiple heat dissipation fins. A drive motor is installed on the side of the fixed frame. The output shaft of the drive motor is connected to a drive gear plate through a coupling. A support frame is welded to the outer periphery of the limit tube.

[0006] Preferably, a driven gear disk is mounted on the outer periphery of the support frame, and the outer periphery of the driven gear disk meshes with the outer periphery of the driving gear disk.

[0007] Preferably, the air inlet frame is provided with a sliding guide groove inside, and a filter plate frame is slidably installed inside the sliding guide groove.

[0008] Preferably, the filter plate frame is equipped with a filter plate for filtering impurities in the air, and the air inlet frame is connected to a cooling water pipe for cooling the gas.

[0009] Preferably, the vertical inner wall of the power transformer casing is provided with two air outlets for the exhaust of internal hot air, and side heat dissipation frames are welded to both sides of the power transformer casing, with multiple heat dissipation plates installed inside the two side heat dissipation frames.

[0010] Preferably, a top plate frame is installed on the top of the power transformer housing, and multiple terminals for external connection are installed inside the top plate frame.

[0011] Preferably, the power transformer housing has multiple windings installed inside, and the core electromagnetic component is installed on the inner bottom wall of the power transformer housing.

[0012] Compared with the prior art, the technical effects and advantages of this utility model are as follows: This oil-immersed power transformer heat sink structure benefits from the structure of the heat sink fins. The drive motor drives the active and driven gear discs to rotate, the driven gear disc drives the support frame and limit tube to rotate, and the limit tube drives the heat sink fins to rotate. The filtered gas comes into contact with the heat sink fins, increasing the heat dissipation efficiency. Compared with the traditional oil-immersed power transformer heat sink structure, which can rotate, this structure can improve the rotational force of the heat sink fins. Some surfaces have sufficient air convection, preventing the formation of thermal resistance and improving the heat dissipation efficiency.

[0013] This oil-immersed power transformer heat sink structure benefits from the filter plate design. The filter plate effectively intercepts dust, oil, and other impurities, preventing them from adhering to the heat sink fins and the transformer's interior. This prevents the heat dissipation area from shrinking due to dust accumulation, maintaining heat exchange efficiency. Secondly, it reduces the amount of impurities entering the transformer tank, protecting the insulating oil from contamination, extending its service life, and ensuring electrical insulation performance. Furthermore, it reduces the risk of dust clogging the heat dissipation channels, maintaining smooth airflow and ensuring stable forced convection operation. In addition, a clean air environment reduces component wear, lowers maintenance frequency and costs, improves the reliability and stability of transformer operation, and ensures the security of power supply. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the internal structure of this utility model; Figure 4 This utility model Figure 2 Enlarged view of point A in the middle; Figure 5 This utility model Figure 3 Enlarged view of point B in the middle.

[0016] Explanation of reference numerals in the attached figures: In the diagram: 1. Power transformer casing; 101. Side heat sink; 102. Heat sink plate; 103. Air outlet; 104. Top plate frame; 105. Terminal; 106. Winding; 107. Core electromagnetic unit; 2. Air inlet frame; 201. Cooling water pipe; 202. Sliding guide groove; 203. Filter plate frame; 204. Filter plate; 3. Fixing frame; 301. Limiting tube; 302. Support frame; 303. Driven gear plate; 304. Heat dissipation fins; 305. Heat dissipation holes; 4. Drive motor; 401. Drive gear plate. Detailed Implementation

[0017] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0018] The connection method can be any existing method, such as bonding, welding, or bolting, depending on the actual needs.

[0019] like Figures 1 to 5The diagram illustrates a heat sink structure for an oil-immersed power transformer, including a transformer housing 1 for protecting the transformer equipment. Oil-immersed power transformers are a common type of power equipment, their core principle being the use of transformer oil as an insulating and cooling medium. Their main structure includes a core, windings, an oil tank, and accessories. The core and windings are immersed in a sealed oil tank filled with transformer oil. During operation, the windings achieve voltage transformation through electromagnetic induction, while the transformer oil plays a dual role. Oil-immersed power transformers are existing equipment and will not be described in detail here. An air inlet frame 2 is connected to the side of the transformer housing 1. The air intake frame 2 has a fixed frame 3 welded inside for support. A limit tube 301 is rotatably installed inside the fixed frame 3. Multiple heat dissipation fins 304 for contact with air are installed obliquely on the outer periphery of the limit tube 301. Multiple heat dissipation holes 305 for ventilation are provided on the surface of the multiple heat dissipation fins 304. A drive motor 4 is installed on the side of the fixed frame 3. The output shaft of the drive motor 4 is connected to a drive gear 401 through a coupling. A support frame 302 is welded to the outer periphery of the limit tube 301. The drive motor 4 drives the drive gear 401 and the driven gear 303 to rotate. The driven gear 303 drives the support frame 302 and the limit tube 301 to rotate. The limit tube 301 drives the heat dissipation fins 304 to rotate. The filtered gas comes into contact with the heat dissipation fins 304 to increase the heat dissipation efficiency. When the drive motor 4 starts, the active gear 401 drives the driven gear 303 to rotate through gear engagement. The rotation of the driven gear 303 is transmitted to the support frame 302 and the limiting tube 301, ultimately driving the heat dissipation fins 304 to rotate at a set speed (10-30 rpm recommended). The rotating fins exert a tangential force on the surrounding air, forming a directional airflow (wind speed can reach 2-5 m / s), causing the air to sweep across the fin surface in a laminar or turbulent manner. Compared to the natural convection heat dissipation of traditional fixed fins (heat transfer coefficient of about 5-10 W / m²·K), forced convection can increase the heat transfer coefficient to 20-50 W / m²·K, significantly enhancing heat exchange efficiency. The air on the surface of the heat dissipation fins 304 forms a boundary layer with a significant temperature gradient, hindering heat transfer. When the fins rotate, the relative motion between their surface and the air continuously breaks down the boundary layer, reducing the thermal boundary layer thickness from several millimeters in the static state to below millimeters. Simultaneously, the centrifugal force generated by the rotation causes hot air to quickly detach from the fin surface, while fresh, cool air replenishes it in a timely manner, forming an efficient heat exchange cycle. Experimental data shows that this effect can improve heat dissipation efficiency by 30%-50%.

[0020] A driven gear 303 is mounted on the outer periphery of the support frame 302. The outer periphery of the driven gear 303 meshes with the outer periphery of the driving gear 401. A sliding guide groove 202 is provided inside the air inlet frame 2. A filter plate frame 203 is slidably mounted inside the sliding guide groove 202. A filter plate 204 for filtering impurities in the air is installed inside the filter plate frame 203. A cooling water pipe 201 for cooling the gas is connected inside the air inlet frame 2. When air enters the air inlet frame 2, the filter plate 204 filters the air. The cooling water pipe 201 can be connected to external circulating cooling water to increase the gas cooling efficiency.

[0021] The vertical inner wall of the power transformer casing 1 is provided with two air outlets 103 for the exhaust of internal hot air. Side heat dissipation racks 101 are welded on both sides of the power transformer casing 1. Multiple heat dissipation plates 102 are installed inside the two side heat dissipation racks 101. External air is drawn into the power transformer casing 1 from the air inlet rack 2. The hot air inside the power transformer casing 1 is exhausted through the air outlets 103. The gas comes into contact with the heat dissipation plates 102, increasing the heat dissipation area.

[0022] A top plate frame 104 is installed on the top of the power transformer casing 1. Multiple terminals 105 for external connection are installed inside the top plate frame 104. Multiple windings 106 are installed inside the power transformer casing 1. The transformer windings are one of its core components and are typically divided into high-voltage windings and low-voltage windings. Windings 106 are part of either the high-voltage or low-voltage windings, located at the edge of the overall winding layout, and are used to achieve specific electrical functions or meet design requirements. A core electromagnetic component 107 is installed on the inner bottom wall of the power transformer casing 1.

[0023] Working principle In use, the oil-immersed power transformer heat sink structure is first connected to the outside via terminal 105, and the drive motor 4 is turned on. The drive motor 4 drives the active gear disk 401 and the driven gear disk 303 to rotate. The driven gear disk 303 drives the support frame 302 and the limiting tube 301 to rotate. The limiting tube 301 drives the heat sink fins 304 to rotate. The heat sink fins 304 act as a fan, drawing outside air from the air inlet frame 2 into the power transformer shell 1. The hot air inside the power transformer shell 1 is discharged through the air outlet 103. The gas contacts the heat sink 102, increasing the heat dissipation area. When the air enters the air inlet frame 2, the filter plate 204 filters the air. The filtered gas contacts the heat sink fins 304, increasing the heat dissipation efficiency. The cooling water pipe 201 can be connected to external circulating cooling water to increase the gas cooling efficiency.

[0024] It should be noted that in this article, relational terms such as one and two are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A heat sink structure for an oil-immersed power transformer, comprising a power transformer housing (1) for protecting the transformer equipment, characterized in that: The side of the power transformer casing (1) is connected to an air intake frame (2); The air intake frame (2) has a fixed frame (3) welded inside for support. A limiting tube (301) is rotatably installed inside the fixed frame (3). Multiple heat dissipation fins (304) for contact with air are installed obliquely on the outer periphery of the limiting tube (301). Multiple heat dissipation holes (305) for ventilation are provided on the surface of the multiple heat dissipation fins (304). A drive motor (4) is installed on the side of the fixed frame (3). The output shaft of the drive motor (4) is connected to a drive gear plate (401) through a coupling. A support frame (302) is welded to the outer periphery of the limiting tube (301).

2. The heat sink structure of an oil-immersed power transformer according to claim 1, characterized in that: The outer periphery of the support frame (302) is equipped with a driven gear disk (303), and the outer periphery of the driven gear disk (303) is meshed with the outer periphery of the driving gear disk (401).

3. The heat sink structure of an oil-immersed power transformer according to claim 1, characterized in that: The air inlet frame (2) is provided with a sliding guide groove (202), and a filter plate frame (203) is slidably installed inside the sliding guide groove (202).

4. The heat sink structure of an oil-immersed power transformer according to claim 3, characterized in that: The filter plate frame (203) is equipped with a filter plate (204) for filtering impurities in the air, and the air inlet frame (2) is connected to a cooling water pipe (201) for cooling the gas.

5. The heat sink structure of an oil-immersed power transformer according to claim 1, characterized in that: The power transformer housing (1) has two air outlets (103) on its vertical inner wall for discharging internal hot air. Side heat dissipation racks (101) are welded to both sides of the power transformer housing (1), and multiple heat dissipation plates (102) are installed inside the two side heat dissipation racks (101).

6. The heat sink structure of an oil-immersed power transformer according to claim 1, characterized in that: The top of the power transformer housing (1) is equipped with a top plate frame (104), and the top plate frame (104) has multiple terminals (105) for external connection.

7. The heat sink structure of an oil-immersed power transformer according to claim 1, characterized in that: The power transformer housing (1) has multiple windings (106) installed inside, and a core electromagnetic part (107) is installed on the inner bottom wall of the power transformer housing (1).

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