A finned radiator for a transformer which is easy to maintain

Abstract

The present application belongs to the technical field of transformer heat dissipation, and particularly relates to a sheet type radiator for transformer convenient to maintain, which comprises an oil tank, a shell, an electric turntable and the like; a wind direction sensor is arranged on the oil tank; the oil tank is fixedly connected inside the shell; a chamber is arranged between the shell and the oil tank; the electric turntable is fixedly connected to the bottom plate, and the rotating part of the electric turntable is fixedly connected to the shell; a plurality of air inlets are formed on the surface of the shell, and air outlets are formed on the surface of the shell opposite to the air inlets; a plurality of heat dissipation fins are fixedly connected to each side of the oil tank, cavities are formed in the heat dissipation fins, and the heat dissipation fins penetrate through the shell; a plurality of ventilation holes are formed in the part of the heat dissipation fins in the chamber. Advantage: During the heat dissipation process, the oil tank and the shell are driven to rotate by the electric turntable, external air is introduced into the chamber, and the external air flows in the chamber, so that the cooling oil in the oil tank and the heat dissipation fins are preliminarily cooled, and the heat dissipation effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of transformer heat dissipation technology, specifically relating to a plate-type heat sink for transformers that is easy to maintain. Background Technology

[0002] An oil-immersed transformer is a type of transformer in which the main components, such as the iron core and coils, are placed in a sealed oil tank, and the cooling oil in the tank is used to achieve cooling and electrical insulation functions. In order to improve its heat dissipation performance, plate radiators are usually installed on the transformer casing.

[0003] A patent with publication number CN118762904A discloses a plate-type radiator for a transformer, in which an oil cavity is provided inside the radiator fins. During operation, cooling oil is drawn from the transformer tank, passes through the oil cavity of the radiator fins, and then flows back to the tank. In this process, the radiator fins exchange heat with the outside air, thereby dissipating the heat in the cooling oil into the air and cooling the cooling oil inside the transformer. However, since the radiator fins are usually fixedly installed on the transformer surface at intervals, heat tends to accumulate in the gaps between them when the radiator fins are working. At the same time, the radiator fins themselves also obstruct the outside airflow, resulting in poor air circulation. This poor airflow performance limits the effective heat conduction between the radiator fins, ultimately affecting the overall heat dissipation efficiency of the plate-type radiator.

[0004] In summary, this application proposes a finned heat sink for transformers that is easy to maintain, thereby improving the aforementioned technical problems. Summary of the Invention

[0005] To overcome the shortcomings of heat sinks, such as heat accumulating in the gaps between them during operation and the obstruction of airflow caused by the heat sinks themselves, this invention provides a plate-type heat sink for transformers that is easy to maintain.

[0006] The technical implementation scheme of the present invention is as follows: a finned radiator for transformers that is easy to maintain, comprising an oil tank; an air direction sensor is installed on the oil tank; an outer shell is also included; the oil tank is fixedly connected inside the outer shell; a cavity is provided between the outer shell and the oil tank; an electric turntable is fixedly connected to the chassis, and the rotating part of the electric turntable is fixedly connected to the outer shell; a plurality of air inlets are opened on the surface of the outer shell, and an air outlet is opened on the surface of the outer shell opposite to the air inlets; a plurality of heat dissipation fins are fixedly connected to each side of the oil tank, the heat dissipation fins have cavities inside, and the heat dissipation fins penetrate the outer shell; a plurality of ventilation holes are opened at the part of the heat dissipation fins in the cavity; the oil tank is connected to an oil supply pipe, an oil pump is installed inside the oil tank, and the output part of the oil pump is connected to the oil supply pipe; the oil supply pipe is connected to a plurality of delivery pipes; each delivery pipe is connected to an oil inlet pipe at the other end; each oil inlet pipe is connected to a plurality of oil delivery pipes that correspond one-to-one with the cavity; the oil tank is connected to a plurality of oil outlet pipes; each oil outlet pipe is connected to a plurality of oil delivery pipes that correspond one-to-one with the cavity.

[0007] Furthermore, it also includes a U-shaped plate and a fan; the housing is fixedly attached to the U-shaped plate located above the heat sink; the U-shaped plate has several through holes, and a fan is fixedly attached to each through hole, facing the gap between adjacent heat sinks.

[0008] Furthermore, the air inlet is located at the junction of two adjacent sides of the casing, and the air outlet is located on the other two sides, within the area between the heat sinks.

[0009] Furthermore, the outer casing is made of aluminum alloy.

[0010] Furthermore, it also includes a movable baffle and a fixed baffle that is fixedly connected to the cavity; several movable baffles are rotatably connected to the cavity by torsion springs, and the movable baffles are located below the fixed baffles.

[0011] Furthermore, it also includes a collection plate; each heat sink has a collection plate with a collection slot fixed to its underside.

[0012] Furthermore, the collection groove of the collection plate is inclined downward towards the outer shell, and has an opening at the lower end that extends into the outer shell, and the outer shell is provided with a collection port.

[0013] Furthermore, it also includes a drain box fixed to the oil tank, which serves as an intermediate structure connecting the oil supply pipe and the delivery pipe; the drain box is fixed to two electric push rods; the telescopic parts of the two electric push rods are jointly fixed to a filter screen, and after the electric push rods extend, they drive the filter screen to be placed between the oil supply pipe and the delivery pipe to filter the cooling oil flowing from the oil supply pipe to the delivery pipe.

[0014] Furthermore, the bottom of the drainage box is designed as a frustum with a high center and low edges, and the filter screen has a through hole in the center that matches the frustum, and the cross-section of the filter screen is designed as a concave shape.

[0015] Furthermore, the top of the drainage box is equipped with a removable cover.

[0016] Beneficial effects: During the heat dissipation process, the electric turntable drives the oil tank and the outer shell to rotate, introducing outside air into the chamber and allowing it to flow within the chamber, thereby initially dissipating heat from the cooling oil and heat sink inside the oil tank and improving the heat dissipation effect.

[0017] When the air inlet is directly facing the direction of the external airflow, and the front heat sink is tilted in the direction of the airflow, the outside air can be directly blown into the gaps between the front heat sinks, thereby improving the airflow between the front heat sinks and increasing the heat dissipation effect of the heat sink. At the same time, the air outlet blows air into the gaps between the rear heat sinks, which can also drive the airflow between the rear heat sinks, thereby improving the overall natural heat dissipation effect of the heat sink.

[0018] By using fixed and movable baffles, the cooling oil flowing inside the cavity can be blocked, increasing its residence time within the cavity and thus increasing the cooling oil's heat dissipation time and improving the heat dissipation effect. Furthermore, by filling most of the cavity with cooling oil before expelling it from the heat sink, the contact area between the cooling oil and the heat sink is increased, improving the overall heat dissipation effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a plate-type heat sink for transformers that is easy to maintain, as disclosed in this invention;

[0020] Figure 2 This is a cross-sectional view of the outer casing disclosed in this invention;

[0021] Figure 3 This is a schematic diagram showing the positional structure of the air inlet and air outlet on the outer casing as disclosed in this invention.

[0022] Figure 4 This is a schematic diagram showing the positional structure of the air outlet and heat sink disclosed in this invention.

[0023] Figure 5 This is a schematic diagram of the internal structure of the heat sink disclosed in this invention;

[0024] Figure 6 This is a schematic diagram of the structure of the heat sink and collection plate assembly disclosed in this invention;

[0025] Figure 7 This is a schematic diagram of the structure of the oil supply pipe, delivery pipe and drainage box assembly disclosed in this invention;

[0026] Figure 8 This is a schematic diagram of the structure of the drainage box, electric push rod and filter screen assembly disclosed in this invention.

[0027] In the diagram: 1. Oil tank; 2. Chassis; 3. Electric turntable; 4. Outer shell; 41. Chamber; 42. Air inlet; 43. Air outlet; 44. Collection port; 5. Oil supply pipe; 6. Delivery pipe; 7. Oil inlet pipe; 71. Oil delivery pipe one; 8. Heat sink; 81. Ventilation hole; 82. Cavity; 9. Oil outlet pipe; 91. Oil delivery pipe two; 10. U-shaped plate; 11. Fan; 101. Fixed baffle; 102. Movable baffle; 111. Collection plate; 201. Drainage box; 202. Electric push rod; 203. Filter screen. Detailed Implementation

[0028] References to embodiments herein mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] Example 1: A plate-type heat sink for transformers that is easy to maintain, referring to... Figures 1 to 7 As shown, it includes an oil tank 1; an air direction sensor is installed on the oil tank 1; it also includes a housing 4, a chassis 2, an electric turntable 3, an oil supply pipe 5, a delivery pipe 6, an oil inlet pipe 7, an oil delivery pipe 1 71, a heat sink 8, an oil outlet pipe 9, and an oil delivery pipe 2 91; the oil tank 1 is fixedly connected inside the housing 4; a chamber 41 is provided between the housing 4 and the oil tank 1; the electric turntable 3 is fixedly connected to the upper side of the chassis 2, and the rotating part of the electric turntable 3 is fixedly connected to the housing 4; several air inlets 42 are opened on the surface of the housing 4, and air outlets 43 are opened on the surface of the housing 4 opposite to the air inlets 42; several heat sinks 8 are fixedly connected to each side of the oil tank 1. The interior of the tank 8 has a cavity 82, and the heat sink 8 penetrates the outer shell 4; the heat sink 8 has several ventilation holes 81 at the part of the cavity 41; the oil tank 1 is connected to the oil supply pipe 5, and the oil tank 1 is equipped with an oil pump, and the output part of the oil pump is connected to the oil supply pipe 5; the oil supply pipe 5 is connected to four delivery pipes 6; each delivery pipe 6 is connected to an oil inlet pipe 7 at the other end; each oil inlet pipe 7 is connected to several oil delivery pipes 71, and the oil delivery pipes 71 are connected to the cavity 82; the oil tank 1 is connected to four oil outlet pipes 9; each oil outlet pipe 9 is connected to several oil delivery pipes 91, and the oil delivery pipes 91 are connected to the cavity 82.

[0030] It also includes a U-shaped plate 10 and a fan 11; the housing 4 is fixedly connected to the U-shaped plate 10, and the U-shaped plate 10 is located above the heat sink 8; the U-shaped plate 10 has several through holes, and each through hole is fixedly connected to a fan 11 facing the gap between adjacent heat sinks 8.

[0031] The air inlet 42 is located at the junction of two adjacent sides of the outer casing 4, and the air outlet 43 is located on the other two sides and in the area between the heat sinks 8. The air outlet 43 blows air into the gap between the heat sinks 8 on the rear side, thereby providing auxiliary heat dissipation for the heat sinks 8.

[0032] The outer shell 4 is made of aluminum alloy, which has strong thermal conductivity and structural strength.

[0033] The working steps of the above embodiment are as follows: The entire equipment must be installed on the ground for use. When the transformer in the oil tank 1 is working, the control oil pump sequentially passes the cooling oil in the oil tank 1 through the oil supply pipe 5, the delivery pipe 6, the inlet pipe 7, and the first delivery pipe 71, into the cavity 82 of the heat sink 8. Then, the cooling oil in the cavity 82 sequentially flows back into the oil tank 1 through the second delivery pipe 91 and the outlet pipe 9. During this process, heat exchange occurs through the contact between the heat sink 8 and the outside air, thereby dissipating the heat in the cooling oil to the outside air. The cooling oil in the oil tank 1 is cooled down. However, since the heat sink 8 of the plate radiator is usually fixedly installed on the surface of the transformer at intervals, heat is easily accumulated in the gaps between the heat sink 8 when it is working. Therefore, a fan 11 is installed on the U-shaped plate 10 above the heat sink 8. By rotating the fan 11, the outside air is driven from top to bottom to draw air between the heat sink 8. By driving the air to flow between the heat sink 8, the heat dissipation effect of the heat sink 8 on the cooling oil is improved, thereby removing the heat accumulated between the heat sink 8.

[0034] However, considering that transformers typically need to operate continuously for 24 hours, and that during heat dissipation, the heat sinks 8, being fixedly installed at intervals, obstruct the flow of external airflow, reducing the speed of airflow between the heat sinks 8 and thus decreasing the natural heat dissipation effect, an outer casing 4 is added. A chamber 41 is provided between the outer casing 4 and the oil tank 1. When the transformer is operating, a wind direction sensor on the oil tank 1 monitors the external wind direction and simultaneously controls the electric turntable 3 on the chassis 2 to rotate the oil tank 1 and the outer casing 4, ensuring that the air inlet 42 of the outer casing 4 faces the direction of the external airflow, thus improving heat dissipation. Guided by the plate 8 and the spiral plate 10, the air blown in through the air inlet 42 is guided into the chamber 41, allowing the outside air to flow in the chamber 41 and be blown out from the air outlet 43, thereby initially dissipating heat from the cooling oil inside the oil tank 1. When the outside air flows in the chamber 41, it passes through the ventilation holes 81 on the heat sink 8 located in the chamber 41, which also dissipates heat from the heat sink 8. Thus, during operation, the electric turntable 3 drives the oil tank 1 and the outer shell 4 to rotate, introducing outside air into the chamber 41 and allowing it to flow in the chamber 41, thereby initially dissipating heat from the cooling oil inside the oil tank 1 and the heat sink 8, improving the heat dissipation effect.

[0035] And, as Figure 1 As shown, when the electric turntable 3 drives the oil tank 1 and the outer casing 4 to rotate, the air inlet 42 of the outer casing 4 faces the direction of the external airflow, causing the front heat sink 8 to be tilted towards the direction of the wind, allowing the external air to be directly blown into the gap between the front heat sink 8, thereby improving the airflow between the front heat sink 8 and increasing the heat dissipation effect of the heat sink 8. At the same time, the air outlet 43 is set at the gap between the rear heat sink 8, introducing the air in the chamber 41 and blowing it into the gap between the rear heat sink 8 through the air outlet 43, thereby also driving the airflow between the rear heat sink 8 and increasing the heat dissipation effect of the heat sink 8. This prevents the rear heat sink 8 from being on the leeward side after the oil tank 1 and the outer casing 4 rotate, as the heat sink 8 in this part cannot contact the air, resulting in a weaker heat dissipation effect in this part compared to the front.

[0036] It also includes a movable baffle 102 and a fixed baffle 101; several fixed baffles 101 are fixedly connected inside the cavity 82; several movable baffles 102 are rotatably connected inside the cavity 82 by torsion springs, and the movable baffles 102 are located below the fixed baffles 101.

[0037] Furthermore, considering that when cooling oil flows through the heat sink 8, existing methods typically involve setting an S-shaped pipe inside the heat sink 8 to increase the flow time of the cooling oil within the heat sink 8, thereby improving the heat dissipation effect. However, the cooling oil only flows within the S-shaped pipe, resulting in a small contact area with the heat sink 8, making it difficult to fully transfer the heat of the cooling oil to all parts of the heat sink 8. This can easily lead to uneven temperature distribution throughout the heat sink 8, resulting in poor overall heat dissipation. Therefore, a cavity 82 is provided inside the heat sink 8, and a fixed baffle 101 and a movable baffle 102 are installed within the cavity 82. Initially, the movable baffle 102 is in contact with the fixed baffle 101 under the action of a torsion spring. When the oil supply pipe 71 introduces cooling oil into the cavity 82 of the heat sink 8, the cooling oil falls above the fixed baffle 101 and the movable baffle 102. As the cooling oil continues to flow in, the fixed baffle 101 and the movable baffle 102... The cooling oil above the baffle 102 fills the space above the fixed baffle 101 and the movable baffle 102. When the pressure generated by the cooling oil accumulated above the movable baffle 102 exceeds the force of the torsion spring on the movable baffle 102, the continuously flowing cooling oil forces the movable baffle 102 to rotate downwards and separate from the fixed baffle 101, so that the cooling oil continues to flow downwards along the cavity 82. The same operation is repeated to fill the cavity 82 with cooling oil and then flow into the oil supply pipe 91. In this way, the fixed baffle 101 and the movable baffle 102 can block the cooling oil flowing in the cavity 82, increase its residence time in the cavity 82, thereby increasing the heat dissipation time of the cooling oil and improving the heat dissipation effect. Furthermore, by filling most of the cavity 82 with cooling oil and then discharging it from the heat sink 8, the contact area between the cooling oil and the heat sink 8 is increased, improving the overall heat dissipation effect.

[0038] It also includes a collection plate 111; each heat sink 8 has a collection plate 111 fixedly attached to its lower side, and the collection plate 111 has a collection groove.

[0039] The collection groove of the collection plate 111 is inclined downward towards the outer shell 4, and has an opening at the lower end that extends into the outer shell 4. The outer shell 4 is provided with a collection port 44. When the cooling oil leaks and is collected in the collection groove of the collection plate 111, it can be guided to collect into the chamber 41. Subsequently, the cooling oil in the chamber 41 can be recovered by manually opening the collection port 44.

[0040] Furthermore, considering that the heat sink 8 is usually made by welding two profiles together, and that the weld joint of the heat sink 8 is prone to damage due to thermal expansion and contraction, resulting in cooling oil leakage, the existing cooling oil leakage detection usually requires the cooling oil to be lost to 3%-5% of the total oil volume before triggering an alarm. The lost cooling oil will drip directly onto the surrounding working area, which not only wastes the cooling oil but also increases the difficulty of subsequent manual cleaning and maintenance. Therefore, when cooling oil leaks at the weld joint of the heat sink 8, the leaked cooling oil flows downward along the surface of the heat sink 8 and falls into the collection groove on the collection plate 111 on the lower side of the heat sink 8, and then flows into the chamber 41 along the collection groove, thereby collecting the leaked cooling oil inside the chamber 41. The outer shell 4 is provided with a collection port 44, which can be opened by personnel to recover the cooling oil in the chamber 41, preventing the leaked cooling oil from dripping directly onto the surrounding working area, which would not only waste the cooling oil but also increase the difficulty of subsequent manual cleaning and maintenance.

[0041] Example 2: Based on Example 1, referring to... Figures 7-8 As shown, it also includes a drain box 201, an electric push rod 202, and a filter screen 203; the drain box 201 is fixedly connected to the oil tank 1, and the drain box 201 serves as an intermediate structure to connect the oil supply pipe 5 and the delivery pipe 6; the drain box 201 is fixedly connected to two electric push rods 202; the telescopic parts of the two electric push rods 202 are jointly fixedly connected to a filter screen 203, and after the electric push rods 202 extend, they drive the filter screen 203 to be placed between the oil supply pipe 5 and the delivery pipe 6 to filter the cooling oil flowing from the oil supply pipe 5 to the delivery pipe 6.

[0042] The bottom of the flow box 201 is set as a frustum with a high center and low sides. The filter screen 203 has a through hole in the center that matches the frustum. The cross-section of the filter screen 203 is set as a concave shape. The cooling oil needs to flow to a position higher than the filter screen 203 before flowing to the delivery pipe 6, so as to ensure that the cooling oil is guided to flow through the filter screen 203 for filtration and to ensure the separation effect of impurities.

[0043] The top of the drainage box 201 is equipped with a removable cover, which can be opened later to replace and clean the filter 203.

[0044] Based on the above embodiment 1, as the cooling oil continues to be used, impurities generated by continuous equipment operation wear and tear, as well as oxide impurities generated by oxidation reactions of the cooling oil under high-temperature environments, will gradually accumulate in the cooling oil, leading to an increase in the impurity content. The accumulation of these impurities not only affects the heat dissipation performance of the cooling oil but may also reduce its insulation capacity, thereby affecting the safe operation of the transformer. Therefore, when the oil pump inside the oil tank 1 supplies cooling oil to the oil supply pipe 5, if... Figure 7 As shown, the oil supply pipe 5 guides the cooling oil into the drainage box 201, and then into the delivery pipe 6 for subsequent heat dissipation. When the cooling oil needs to be cleaned after a predetermined time, considering that the filter screen 203 will slow down the flow of cooling oil, reduce circulation efficiency, and affect the overall heat dissipation effect during the filtration process, during periods of low grid load at night (such as late at night to early morning), when the overall power demand is reduced, the transformer operates at low power and requires less heat dissipation, the electric push rod 202 is controlled to move the filter screen 203 downwards. Figure 8 As shown, the filter screen 203 is made to fit against the bottom of the drainage box 201. When the oil supply pipe 5 introduces cooling oil into the drainage box 201, the cooling oil first falls onto the filter screen 203. After the filter screen 203 filters and intercepts impurities, the cooling oil is then introduced into the delivery pipe 6, thereby filtering and removing impurities from the cooling oil. This process continues until all the cooling oil has completely circulated to the predetermined number of times. Then, the electric push rod 202 is controlled again to move the filter screen 203 upward, removing the filter screen 203 and the filtered impurities from the cooling oil. This prevents the filter screen 203 and the impurities filtered by the filter screen 203 from obstructing the flow of cooling oil and affecting the overall heat dissipation effect.

[0045] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A plate-type radiator for transformers that is easy to maintain, comprising an oil tank (1); a wind direction sensor is installed on the oil tank (1); characterized in that: It also includes an outer shell (4); an oil tank (1) is fixedly connected inside the outer shell (4); a chamber (41) is provided between the outer shell (4) and the oil tank (1); an electric turntable (3) is fixedly connected to the chassis (2), and the rotating part of the electric turntable (3) is fixedly connected to the outer shell (4); several air inlets (42) are opened on the surface of the outer shell (4), and air outlets (43) are opened on the surface of the outer shell (4) opposite to the air inlets (42); several heat sinks (8) are fixedly connected to each side of the oil tank (1), the heat sinks (8) have cavities (82) inside, and the heat sinks (8) penetrate the outer shell (4). The heat sink (8) has several ventilation holes (81) at the location of the cavity (41); the oil tank (1) is connected to the oil supply pipe (5), and an oil pump is installed inside the oil tank (1), with the oil pump output connected to the oil supply pipe (5); the oil supply pipe (5) is connected to several delivery pipes (6); each delivery pipe (6) has an oil inlet pipe (7) connected to its other end; each oil inlet pipe (7) is connected to several oil delivery pipes (71) that correspond one-to-one with the cavity (82); the oil tank (1) is connected to several oil outlet pipes (9); each oil outlet pipe (9) is connected to several oil outlet pipes (9). Several oil pipes (91) are connected to the cavity (82); a U-shaped plate (10) and a fan (11) are also included; the outer shell (4) is fixedly connected to the U-shaped plate (10) located above the heat sink (8); the U-shaped plate (10) has several through holes, and a fan (11) facing the gap between adjacent heat sinks (8) is fixedly connected to each through hole; a movable baffle (102) and a fixed baffle (101) fixedly connected to the cavity (82) are also included; several movable baffles (102) are rotatably connected to the cavity (82) by torsion springs, and the movable baffles (102) are rotatably connected to the cavity (82) by torsion springs. 2) Located below the fixed baffle (101); also includes a diversion box (201) fixed to the oil tank (1), the diversion box (201) serves as an intermediate structure to connect the oil supply pipe (5) and the delivery pipe (6); the diversion box (201) is fixed to two electric push rods (202); the telescopic parts of the two electric push rods (202) are fixed to a filter screen (203), after the electric push rods (202) extend, they drive the filter screen (203) to be placed between the oil supply pipe (5) and the delivery pipe (6) to filter the cooling oil flowing from the oil supply pipe (5) to the delivery pipe (6).

2. The easily maintainable plate-type radiator for transformers according to claim 1, characterized in that: The air inlet (42) is located at the junction of two adjacent sides of the outer casing (4), and the air outlet (43) is located on the other two sides and in the area between the heat sinks (8).

3. The easily maintainable plate-type radiator for transformers according to claim 1, characterized in that: The outer shell (4) is made of aluminum alloy.

4. A finned radiator for transformers that is easy to maintain, as described in claim 1, characterized in that: It also includes a collection plate (111); each heat sink (8) has a collection plate (111) with a collection groove fixed to its lower side.

5. A finned radiator for transformers that is easy to maintain, as described in claim 4, characterized in that: The collection groove of the collection plate (111) is inclined downward towards the outer shell (4), and has an opening at the bottom that extends into the outer shell (4). The outer shell (4) is provided with a collection port (44).

6. A finned radiator for transformers that is easy to maintain, as described in claim 1, characterized in that: The bottom of the drainage box (201) is set as a frustum with a high center and low sides. The filter screen (203) has a through hole in the center that matches the frustum, and the cross-section of the filter screen (203) is set as a concave shape.

7. A finned radiator for transformers that is easy to maintain, as described in claim 6, characterized in that: The drainage box (201) has a removable top cover.

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