Transformer finned radiator convenient to maintain

Abstract

The invention belongs to the technical field of transformer heat dissipation, and particularly relates to a transformer finned radiator 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; an oil tank is fixedly connected inside the shell; a chamber is arranged between the shell and the oil tank; the chassis is fixedly connected with an electric turntable, and a rotating part of the electric turntable is fixedly connected with the shell; a plurality of air inlets are formed in the surface of the shell, and air outlets opposite to the air inlets are formed in the surface of the shell; a plurality of cooling fins are fixedly connected to each side of the oil tank, cavities are formed in the cooling fins, and the cooling fins penetrate through the shell; a plurality of ventilation holes are formed in the portion, located in the cavity, of the cooling fin. The heat dissipation device has the advantages that in the heat dissipation process, the electric rotating disc drives the oil tank and the shell to rotate, external air is introduced into the cavity and flows in the cavity, cooling oil and cooling fins in the oil tank are subjected to primary heat dissipation, and the heat dissipation effect is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of transformer heat dissipation, and particularly relates to a sheet type radiator for transformer which is convenient to maintain. BACKGROUND

[0002] An oil-immersed transformer is a kind of transformer in which main components such as a core and a coil are placed in a sealed oil tank, and cooling oil in the oil tank is used to realize cooling and electrical insulation functions; in order to improve the heat dissipation performance, a sheet type radiator is usually installed on the shell of the transformer.

[0003] The patent with the publication number CN118762904A proposes a sheet type radiator for transformer, which is provided with an oil cavity inside the heat dissipation sheet; during operation, the cooling oil is led out from the transformer oil tank, passes through the oil cavity of the heat dissipation sheet, and then flows back to the oil tank; in this process, the heat dissipation sheet exchanges heat with the external air, thereby dissipating the heat in the cooling oil to the air, so as to realize the cooling of the cooling oil inside the transformer; however, since the heat dissipation sheets of the sheet type radiator are usually fixedly installed in an interval mode on the surface of the transformer, when the heat dissipation sheets work, heat is easily accumulated in the gaps between them; at the same time, the heat dissipation sheets themselves also hinder the external air flow, resulting in poor air circulation; this poor air flow performance limits the effective conduction of heat between the heat dissipation sheets, and finally affects the heat dissipation efficiency of the entire sheet type radiator.

[0004] In view of the above, the present application proposes a sheet type radiator for transformer which is convenient to maintain, so as to improve the above-mentioned technical problems. SUMMARY

[0005] In order to overcome the shortcomings that heat is easily accumulated in the gaps between the heat dissipation sheets when the heat dissipation sheets work, and the heat dissipation sheets themselves hinder the external air flow, resulting in poor air circulation, the present application provides a sheet type radiator for transformer which is convenient to maintain.

[0006] The technical implementation scheme of the present application is: a transformer fin radiator convenient to maintain, comprising an oil tank; a wind direction sensor is arranged on the oil tank; further comprising a shell; the oil tank is fixedly connected inside the shell; a cavity is arranged between the shell and the oil tank; a bottom plate is fixedly connected with an electric turntable, and the rotating part of the electric turntable is fixedly connected with the shell; a plurality of air inlets are formed on the surface of the shell, and an air outlet is formed on the surface of the shell opposite to the air inlet; a plurality of heat dissipation fins are fixedly connected on each side of the oil tank, a cavity is formed in the heat dissipation fin, and the heat dissipation fin penetrates the shell; a plurality of ventilation holes are formed in the part of the heat dissipation fin in the cavity; the oil tank is communicated with a oil supply pipe, an oil pump is arranged in the oil tank, and the output part of the oil pump is communicated with the oil supply pipe; the oil supply pipe is connected with a plurality of conveying pipes; one end of each conveying pipe is communicated with an oil inlet pipe; each oil inlet pipe is communicated with a plurality of oil conveying pipes I corresponding to the cavity; the oil tank is communicated with a plurality of oil outlet pipes; each oil outlet pipe is communicated with a plurality of oil conveying pipes II communicated with the cavity.

[0007] Further, further comprising a backplate and a fan; the shell is fixedly connected with the backplate above the heat dissipation fin; the backplate is provided with a plurality of through holes, and each through hole is fixedly connected with a fan facing the gap between adjacent heat dissipation fins.

[0008] Further, the air inlet is located at the intersection of the adjacent two sides of the shell, and the air outlet is located on the other two sides and in the area between the heat dissipation fins.

[0009] Further, the shell is made of aluminum alloy.

[0010] Further, further comprising a movable baffle and a fixed baffle fixedly connected in the cavity; a plurality of movable baffles are rotatably connected in the cavity by torsion springs, and the movable baffles are located below the fixed baffles.

[0011] Further, further comprising a collection plate; each heat dissipation fin is fixedly connected with a collection plate provided with a collection groove below.

[0012] Further, the collection groove of the collection plate is inclined downward to the shell, and the low end is provided with an opening and penetrates into the shell, and the shell is provided with a collection port.

[0013] Further, further comprising a drainage box fixedly connected with the oil tank, the drainage box as an intermediate structure connects the oil supply pipe and the conveying pipe; the drainage box is fixedly connected with two electric push rods; the extension parts of the two electric push rods are fixedly connected with a filter screen, and the filter screen is driven by the extension of the electric push rod to be located between the oil supply pipe and the conveying pipe, so as to filter the cooling oil flowing from the oil supply pipe to the conveying pipe.

[0014] Further, the bottom of the drainage box is provided in the shape of a circular truncated cone with a high middle and low periphery, the filter screen is provided with a through hole matched with the circular truncated cone in the center, and the cross section of the filter screen is provided in the shape of a concave.

[0015] Further, the top of the drainage box is provided with a detachable upper cover.

[0016] Beneficial effect: in the heat dissipation process, the oil tank and the shell are driven to rotate by the electric rotating disc, the external wind is introduced into the chamber, and the cooling oil and the cooling fins in the oil tank are preliminarily cooled, thereby improving the heat dissipation effect.

[0017] When the air inlet is directly opposite to the direction of the external wind flow, the front side cooling fins are inclined to the direction of the wind blowing, so that the external wind can directly blow into the gap between the front side cooling fins, thereby improving the air flow between the front side cooling fins and increasing the heat dissipation effect of the cooling fins; at the same time, the wind is blown into the gap between the rear side cooling fins through the air outlet, so that the air flow between the rear side cooling fins is also driven, thereby improving the natural heat dissipation effect of the overall cooling fins.

[0018] The fixed baffle and the movable baffle can block the cooling oil flowing in the cavity, increase the residence time of the cooling oil in the cavity, increase the heat dissipation time of the cooling oil, and improve the heat dissipation effect. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The structure diagram of the transformer fin radiator convenient to maintain is disclosed in the present application; Figure 2 The cross-sectional view of the shell is disclosed in the present application; Figure 3 The position structure diagram of the air inlet and the air outlet on the shell is disclosed in the present application; Figure 4 The position structure diagram of the air outlet and the cooling fin is disclosed in the present application; Figure 5 The internal structure diagram of the cooling fin is disclosed in the present application; Figure 6 The structure diagram of the combination of the cooling fin and the collection plate is disclosed in the present application; Figure 7 The structure diagram of the combination of the oil supply pipe, the conveying pipe and the drainage box is disclosed in the present application; Figure 8 The structure diagram of the combination of the drainage box, the electric push rod and the filter screen is disclosed in the present application.

[0020] In the figure: 1. oil tank; 2. chassis; 3. electric rotary disc; 4. shell, 41. chamber, 42. air inlet, 43. air outlet, 44. collection port; 5. oil supply pipe; 6. conveying pipe; 7. oil inlet pipe, 71. oil delivery pipe; 8. heat sink, 81. air vent, 82. cavity; 9. oil outlet pipe, 91. oil delivery pipe; 10. backplate; 11. fan; 101. fixed baffle; 102. movable baffle; 111. collection plate; 201. drainage box; 202. electric push rod; 203. filter screen. DETAILED DESCRIPTION

[0021] Reference herein to an embodiment means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0022] Embodiment 1: A sheet-type heat sink for transformer convenient to maintain, referring to Figures 1-7 As shown, it comprises an oil tank 1; the oil tank 1 is provided with an air direction sensor; it further comprises a shell 4, a chassis 2, an electric rotary disc 3, an oil supply pipe 5, a conveying pipe 6, an oil inlet pipe 7, an oil delivery pipe 71, a heat sink 8, an oil outlet pipe 9 and an oil delivery pipe 91; the oil tank 1 is fixedly connected inside the shell 4; a chamber 41 is arranged between the shell 4 and the oil tank 1; the electric rotary disc 3 is fixedly connected to the upper side of the chassis 2, and the rotating part of the electric rotary disc 3 is fixedly connected to the shell 4; a plurality of air inlets 42 are formed on the surface of the shell 4, and a plurality of air outlets 43 are formed on the surface of the shell 4 opposite to the air inlets 42; a plurality of heat sinks 8 are fixedly connected to each side of the oil tank 1, cavities 82 are formed inside the heat sinks 8, and the heat sinks 8 penetrate through the shell 4; a plurality of air vents 81 are formed on the part of the heat sinks 8 in the chamber 41; the oil tank 1 is communicated with the oil supply pipe 5, an oil pump is arranged inside the oil tank 1, and the output part of the oil pump is communicated with the oil supply pipe 5; the oil supply pipe 5 is connected with four conveying pipes 6; each conveying pipe 6 is communicated with an oil inlet pipe 7 at the other end; each oil inlet pipe 7 is communicated with a plurality of oil delivery pipes 71, and the oil delivery pipes 71 are communicated with the cavities 82; the oil tank 1 is communicated with four oil outlet pipes 9; each oil outlet pipe 9 is communicated with a plurality of oil delivery pipes 91, and the oil delivery pipes 91 are communicated with the cavities 82.

[0023] It further comprises a backplate 10 and a fan 11; the backplate 10 is fixedly connected to the shell 4, and the backplate 10 is located above the heat sinks 8; a plurality of through holes are formed on the backplate 10, and each through hole is fixedly connected with a fan 11 facing the gap between adjacent heat sinks 8.

[0024] The air inlet 42 is located at the intersection of two adjacent sides of the shell 4, and the air outlet 43 is located on the other two sides and in the area between the fins 8. The air is blown into the gap between the fins 8 on the rear side through the air outlet 43, thereby assisting in cooling the fins 8.

[0025] The shell 4 is made of aluminum alloy material, which has strong heat conductivity and structural strength.

[0026] The working steps of the above embodiment are as follows: the device as a whole must be installed on the ground for use. When the transformer in the oil tank 1 is working, the control oil pump passes the cooling oil in the oil tank 1 through the oil supply pipe 5, the delivery pipe 6, the oil inlet pipe 7 and the oil delivery pipe 71 in turn, and into the cavity 82 of the fin 8. Then, the cooling oil in the cavity 82 flows back into the oil tank 1 through the oil delivery pipe 92 and the oil outlet pipe 9 in turn. In this process, the heat in the cooling oil is dissipated to the outside air through heat exchange between the fins 8 and the outside air, thereby achieving cooling of the cooling oil in the oil tank 1. However, since the fins 8 of the finned heat sink are usually fixedly installed in an interval on the surface of the transformer, when the fins 8 are working, heat is easily accumulated in the gap between them. Therefore, the fan 11 is arranged on the meander plate 10 above the fins 8. The fan 11 rotates to drive the outside air to be sucked from top to bottom between the fins 8. By driving the air to flow between the fins 8, the heat dissipation effect of the fins 8 on the cooling oil is improved, thereby removing the heat accumulated between the fins 8.

[0027] However, considering that the transformer usually needs to work uninterruptedly for twenty-four hours, and since the fins 8 are fixedly installed in an interval, the fins 8 themselves will hinder the flow of the outside air, weaken the speed of the air flow passing between the fins 8, and thus reduce the natural heat dissipation effect. Therefore, the shell 4 is additionally provided, and a chamber 41 is arranged between the shell 4 and the oil tank 1. When the transformer is working, the wind direction sensor arranged on the oil tank 1 monitors the outside wind direction, and simultaneously controls the electric turntable 3 on the chassis 2 to drive the oil tank 1 and the shell 4 to rotate, so that the air inlet 42 of the shell 4 is directly opposite the direction in which the outside air flows, and under the guidance of the fins 8 and the meander plate 10, the air blown through the air inlet 42 is guided into the chamber 41, so that the outside air flows in the chamber 41 and is blown out from the air outlet 43, thereby preliminarily cooling the cooling oil inside the oil tank 1. When the outside air flows in the chamber 41, the air also passes through the air holes 81 of the fins 8 at the chamber 41 part, thereby cooling the fins 8. In this way, during the working process, the outside air is introduced into the chamber 41 by driving the oil tank 1 and the shell 4 to rotate by the electric turntable 3, so that the outside air flows in the chamber 41, thereby preliminarily cooling the cooling oil inside the oil tank 1 and the fins 8, and improving the heat dissipation effect.

[0028] Furthermore,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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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 an air outlet (43) is 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), and a cavity (82) is opened inside the heat sink (8), and the heat sink (8) penetrates the outer shell (4); the heat sink (8) is located in the chamber. (41) has several ventilation holes (81); the oil tank (1) is connected to the oil supply pipe (5), the oil tank (1) is equipped with an oil pump, and the oil pump output is connected to the oil supply pipe (5); the oil supply pipe (5) is connected to several 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) 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 delivery pipes (91) that correspond one-to-one with the cavity (82).

2. The easily maintainable plate-type radiator for transformers according to claim 1, characterized in that: It also includes a spiral plate (10) and a fan (11); the outer casing (4) is fixedly connected to the spiral plate (10) located above the heat sink (8); the spiral 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.

3. 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).

4. A finned radiator for transformers that is easy to maintain, as described in claim 1, characterized in that: The outer shell (4) is made of aluminum alloy.

5. A finned radiator for transformers that is easy to maintain, as described in claim 1, characterized in that: It also includes a movable baffle (102) and a fixed baffle (101) fixedly connected to the cavity (82); several movable baffles (102) are rotatably connected to the cavity (82) by torsion springs, and the movable baffles (102) are located below the fixed baffles (101).

6. A finned radiator for transformers that is easy to maintain, as described in claim 5, 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.

7. A finned radiator for transformers that is easy to maintain, as described in claim 6, 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).

8. A finned radiator for transformers that is easy to maintain, as described in claim 1, characterized in that: It also includes a drain box (201) fixed to the oil tank (1). 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 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).

9. A finned radiator for transformers that is easy to maintain, as described in claim 8, 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.

10. A finned radiator for transformers that is easy to maintain, as described in any one of claims 8 to 9, characterized in that: The drainage box (201) has a removable top cover.

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