An assembled oil tank and oil-immersed transformer

Abstract

The present application belongs to the technical field of oil-immersed transformer, and particularly relates to an assembled oil tank, which comprises a transformer tank composed of a main tank body, an oil tank side plate, an oil tank top frame and an oil tank top plate; and a heat dissipation mechanism comprising a heat dissipation frame installed on the oil tank side plate, a ventilation seat installed on a mounting cross frame, a heat dissipation fan arranged in the ventilation seat, heat dissipation fins and a heat conduction seat arranged in the heat dissipation frame, and the ventilation seat being connected with the heat dissipation frame through a gas guide cover and a corrugated pipe. The present application aims to solve the problems of fatigue damage caused by vibration and insufficient heat dissipation efficiency. In use, the oil tank side plate is used to install the heat dissipation frame on the main tank body, the ventilation seat and the gas guide cover are installed on the mounting cross frame, the ventilation seat is connected with the heat dissipation frame through the corrugated pipe, and a damping mechanism is used to reduce the vibration transmission to the transformer tank.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil-immersed transformers, and particularly relates to an assembled oil tank and an oil-immersed transformer. BACKGROUND

[0002] As a key equipment in the power system, the oil-immersed transformer is widely used in voltage conversion. The core components thereof include a core, a coil, an insulating material and an oil tank, etc. The oil tank not only serves as a container for insulating oil, but also plays an important role in heat dissipation. The conventional oil tank of the oil-immersed transformer usually adopts a welded steel structure, and the internal pressure balance is achieved through an oil pillow to avoid the problem of excessive pressure caused by temperature rise. However, the existing technology has the following significant defects:

[0003] 1. Fatigue damage caused by vibration: The conventional heat sink is usually directly installed on the oil tank body, and the vibration generated during the operation of the heat sink will be directly transmitted to the connection part of the oil tank, which is easy to cause fatigue damage of the connection part after long-term action, thereby reducing the safety and service life of the equipment;

[0004] 2. Insufficient heat dissipation efficiency: The conventional heat sink lacks effective auxiliary heat dissipation structure, and only relies on natural convection or simple forced air cooling, so the heat dissipation effect is limited, and especially under high temperature or high load working conditions, the problem of insufficient heat dissipation is easy to occur, which affects the stable operation of the transformer;

[0005] In addition, the existing heat sink is easy to adsorb oil stains and dust during long-term use, which further reduces the heat dissipation efficiency, and the conventional design does not fully consider the natural cleaning method such as rainwater washing, thereby increasing the maintenance cost;

[0006] Therefore, it is necessary to design an assembled oil tank and an oil-immersed transformer to solve the above problems. SUMMARY

[0007] The purpose of the present application is to provide an assembled oil tank and an oil-immersed transformer to solve the problems raised in the background.

[0008] To achieve the above purpose, the present application provides the following technical scheme: an assembled oil tank, comprising: a transformer tank body composed of a main tank body, an oil tank side plate, an oil tank top frame and an oil tank top plate;

[0009] A heat dissipation mechanism is arranged on the oil tank side plate, and comprises a heat dissipation frame and a ventilation seat arranged on the mounting cross frame. The ventilation seat is provided with a heat dissipation fan, and the heat dissipation frame is provided with heat dissipation fins and a heat conduction seat. The ventilation seat is connected with the heat dissipation frame through a gas guide cover and a corrugated pipe.

[0010] An oil tank support plate and a buffer oil box are arranged on the surface of the oil tank side plate, and the buffer oil box is connected with the main tank body through a communication pipe.

[0011] The damping mechanism comprises a buffer main seat and a damping seat, a hydraulic damper and a buffer spring are arranged in the buffer main seat, damping sliding plates and damping springs are arranged on both sides of the damping seat, and the damping sliding plates are matched with damping sliding grooves in the buffer main seat.

[0012] Preferably, the surface of the radiating fin is provided with radiating vertical lines which are arranged equidistantly and are attached to the communicating pipe.

[0013] Preferably, the air guide cover is provided with guide plates and blocking plates which are arranged alternately and correspond to the position of the radiating fan.

[0014] Preferably, the damping sliding groove is of an inclined structure and is matched with the damping sliding plate.

[0015] The lower end of the ventilation seat is provided with a filter screen.

[0016] Preferably, the mounting cross frame is provided with a friction damping plate and a damping spring.

[0017] The both ends of the buffer main seat are provided with auxiliary sliding plates and damping sliding plates, and the damping sliding plates are matched with the friction damping plate.

[0018] An oil-immersed transformer comprises an assembled oil tank.

[0019] The inner frame body and the core coil are arranged in the main tank body, and the upper end of the core coil is provided with a clamping plate.

[0020] The side plate of the oil tank is fixedly connected with the main tank body through the mounting clamping plate and the mounting clamping groove.

[0021] Preferably, the upper end of the main tank body is provided with a lifting hook which is located between the top frame of the oil tank and the side plate of the oil tank.

[0022] Preferably, the outer side of the clamping plate is provided with a supporting column.

[0023] The outer side of the inner frame body is provided with a positioning clamping groove which is matched with the positioning convex strip on the side plate of the oil tank.

[0024] Preferably, the bottom of the main tank body is provided with a supporting bottom plate and a buffer pad which support the inner frame body.

[0025] The top plate of the oil tank is press-connected with the clamping plate.

[0026] Preferably, the top plate of the oil tank is provided with a core lead-out sleeve, a low-voltage sleeve and a high-voltage sleeve.

[0027] Compared with the prior art, the present application has the following advantages:

[0028] 1. Through the designed transformer box, the oil tank side plate installs the heat dissipation frame on the main box, the ventilation seat and the air guide cover are installed on the installation cross frame, are connected with the heat dissipation frame through the bellows, and the vibration transmission to the transformer box is reduced by cooperating with the damping mechanism, and the buffer oil box is installed in the heat dissipation frame and is communicated with the main box through the communication pipe, when the oil liquid volume increases in the transformer box, enters the oil tank support plate, and when falling back, is sucked back into the transformer box, and when the heat dissipation fan in the ventilation seat operates and dissipates heat, the airflow flows through the auxiliary heat dissipation from the surface of the oil tank support plate, so that the heat dissipation effect is better.

[0029] 2. Through the designed heat dissipation mechanism, the oil tank support plate at one end of the heat dissipation fin contacts the oil liquid in the main box through the oil tank side plate, so that the heat can be fully contacted with the oil liquid and dissipated, the effect is better when dissipating heat, and after long-term use, too much oil and dust are adsorbed on the heat dissipation fin, which can be naturally washed when it rains, and the guide plate and the blocking plate are used to reduce the rainwater from falling on the heat dissipation fan.

[0030] 3. Through the designed damping mechanism, the damping main seat and the damping seat are supported by the hydraulic damping and the buffer spring during use, the transformer box is installed on the damping main seat and supported by the damping seat and the installation cross frame in the use position, the vibration generated during use is buffered and damped by the buffer spring and the hydraulic damping, and at the same time, the damping slide plate moves in the inclined damping slide groove when sliding due to vibration, the friction damping is strengthened by the damping spring support, and the auxiliary slide plate is used to drive the damping slide plate at one end to slide in the friction damping plate and press on the damping spring when vibrating, so that the damping effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present application;

[0032] Figure 2 It is a schematic diagram of the internal structure of the present application;

[0033] Figure 3 It is a schematic diagram of the heat dissipation structure of the present application;

[0034] Figure 4 It is a schematic diagram of the oil tank side plate structure of the present application;

[0035] Figure 5 It is a schematic diagram of the heat dissipation fan installation structure of the present application;

[0036] Figure 6 It is a schematic diagram of the buffer main seat structure of the present application;

[0037] Figure 7 It is a schematic diagram of the damping and damping structure of the present application;

[0038] Figure 8 It is a schematic diagram of the air ventilation damping structure of the present application;

[0039] Figure 9 This is a schematic diagram of the mounting frame structure of the present invention;

[0040] In the diagram: 1. Transformer housing; 11. Main housing; 12. Tank side plate; 121. Mounting plate; 122. Mounting slot; 13. Tank top frame; 14. Tank top plate; 15. Lifting hook; 16. Mounting crossbeam; 17. Inner frame; 171. Positioning protrusion; 172. Positioning slot; 173. Support base plate; 174. Buffer pad; 18. Clamping plate; 19. Iron core coil; 191. Support column; 2. Heat dissipation mechanism; 21. Heat dissipation frame; 22. Ventilation seat; 23. Air guide hood; 231. Corrugated pipe; 232. Guide plate; 233. Barrier plate; 24. Heat sink; 241. Heat conduction seat; 242. Heat dissipation vertical groove; 25. Oil tank support plate; 26. Connecting pipe; 27. Buffer oil box; 28. Filter screen; 29. ​​Cooling fan; 3. Vibration damping mechanism; 31. Buffer main seat; 311. Vibration damping slide; 312. Vibration damping slide plate; 313. Vibration damping spring; 32. Vibration damping seat; 33. Auxiliary slide plate; 34. Buffer spring; 35. Hydraulic damping; 36. Friction damping plate; 37. Damping slide plate; 38. Damping spring. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example 1: Please refer to Figures 1 to 9 The present invention provides a technical solution: a prefabricated oil tank, including a transformer housing 1, the transformer housing 1 including a main housing 11, an oil tank side plate 12 is provided on one side of the main housing 11, a heat dissipation mechanism 2 is provided on one side of the oil tank side plate 12, an installation crossbeam 16 is installed at the lower end of the main housing 11 through a vibration damping mechanism 3, an oil tank top frame 13 is provided at the upper end of the main housing 11, and an oil tank top plate 14 is provided on the upper side of the oil tank top frame 13;

[0043] The heat dissipation mechanism 2 comprises a heat dissipation frame 21 mounted on the oil tank side plate 12 and a ventilation seat 22 mounted on the mounting cross frame 16, the inner side of the ventilation seat 22 is provided with a heat dissipation fan 29, the inner side of the heat dissipation frame 21 is provided with a heat dissipation fin 24, one side of the heat dissipation fin 24 is provided with a heat conduction seat 241, the oil liquid in the transformer tank 1 is discharged into the buffer oil box 27 through the communication pipe 26 due to the increase in volume caused by temperature rise, the heat dissipation fin 24 and the heat conduction seat 241 quickly absorb heat and dissipate heat outward, the upper side of the ventilation seat 22 is provided with a gas guide cover 23, the upper side of the gas guide cover 23 is provided with a bellows 231, the upper end of the bellows 231 is connected with the lower end of the heat dissipation frame 21, the heat dissipation fan 29 runs to blow air onto the heat dissipation fin 24 and the buffer oil box 27 to accelerate heat dissipation, and the connection of the bellows 231 reduces the vibration of the heat dissipation fan 29 running and transmits to the oil tank side plate 12; the surface of the oil tank side plate 12 is provided with an oil tank support plate 25, one side of the oil tank support plate 25 is provided with the buffer oil box 27, the buffer oil box 27 is located between the communication pipe 26 and the heat dissipation fin 24, the heat conduction seat 241 is internally provided with the communication pipe 26, and the lower end of the communication pipe 26 is in communication with the bottom of the inner side of the buffer oil box 27, and the upper end of the communication pipe 26 penetrates through the oil tank side plate 12 and is in communication with the inside of the main tank body 11; the surface of the heat dissipation fin 24 is provided with heat dissipation vertical lines 242, the depth is 2-5mm, and the interval is 10-20mm, so as to increase the heat dissipation surface area, the heat dissipation fin 24 is equidistantly mounted on the inner side of the heat dissipation frame 21, and one side of the heat dissipation fin 24 is attached to the surface of the communication pipe 26; the inner side of the gas guide cover 23 is provided with a guide plate 232 and a blocking plate 233, the position of the blocking plate 233 corresponds to the position of the heat dissipation fan 29, a channel is formed between the blocking plate 233 and the gas guide cover 23, and the channel is staggered with the position of the heat dissipation fan 29, the guide plate 232 is inclined and corresponds to the position of the channel, and when it rains in daily use, the rainwater flowing down from the heat dissipation fin 24 can wash away dust and the like, and the guide plate 232 and the blocking plate 233 guide and reduce the phenomenon of flowing to the heat dissipation fan 29.

[0044] In use, the heat dissipation frame 21 is mounted on the main tank body 11 by the oil tank side plate 12, the ventilation seat 22 and the gas guide cover 23 are mounted on the mounting cross frame 16, the bellows 231 is connected with the heat dissipation frame 21, and the vibration is reduced by the damping mechanism 3 to reduce the vibration transmitted to the transformer tank 1, the buffer oil box 27 is mounted in the heat dissipation frame 21 and is in communication with the inside of the main tank body 11 through the communication pipe 26, when the oil liquid in the transformer tank 1 is heated and the volume is increased, it enters the oil tank support plate 25, and when it falls back, it is sucked back into the transformer tank 1, and when the heat dissipation fan 29 runs to dissipate heat in the ventilation seat 22, the airflow flows through the oil tank support plate 25 to assist heat dissipation, so that the heat dissipation effect is better.

[0045] From the above description, the heat dissipation mechanism 2 has the following beneficial effects: the oil tank support plate 25 at one end of the heat dissipation fin 24 passes through the oil tank side plate 12 and contacts the oil liquid in the main tank body 11, so that the heat can be fully contacted with the oil liquid and dissipated, the effect is better during heat dissipation, and after long-term use, too much oil and dust are adsorbed on the heat dissipation fin 24, which can be naturally washed when it rains, and the guide plate 232 and the blocking plate 233 are matched to reduce the rainwater from falling on the heat dissipation fan 29.

[0046] The damping mechanism 3 comprises a buffer main seat 31 installed at the lower end of the main tank body 11 and a damping seat 32 installed on the upper side of the installation cross frame 16, a hydraulic damper 35 is arranged at the middle of the inner side of the buffer main seat 31, buffer springs 34 are arranged at both ends of the inner side of the buffer main seat 31, one end of the hydraulic damper 35 is supported on the inner side of the damping seat 32, and one end of the buffer spring 34 is supported on one side of the damping seat 32, so that the buffer and damping are realized through the buffer spring 34 and the hydraulic damper 35; a damping sliding groove 311 is formed in the inner wall of the buffer main seat 31, the inclination angle of the damping sliding groove 311 is 30°-45°, so as to enhance the friction damping effect, damping springs 313 are installed at both sides of the inner side of the damping seat 32, one end of the damping spring 313 is fixedly installed with a damping sliding plate 312, the damping sliding plate 312 is slidingly installed at both sides of the damping seat 32, and one end of the damping sliding plate 312 is slidingly installed in the damping sliding groove 311; when the buffer main seat 31 and the damping seat 32 relatively slide due to vibration, the damping sliding plate 312 further slides in the damping sliding groove 311 to further dampen the vibration; the inner side of the damping sliding groove 311 is arranged in an inclined shape, one end of the damping sliding plate 312 is attached to the inclined surface of the damping sliding groove 311, so as to facilitate the friction damping between the damping sliding plate 312 and the damping sliding groove 311, and the lower end of the ventilation seat 22 is provided with a filter screen 28, so as to facilitate airflow filtration during use; the inner side of the installation cross frame 16 is fixedly installed with a friction damping plate 36, the inner side of the friction damping plate 36 is installed with a damping spring 38, both ends of the buffer main seat 31 are provided with auxiliary sliding plates 33, the lower side of the auxiliary sliding plate 33 is provided with a damping sliding plate 37, the damping sliding plate 37 is slidingly installed in the inner side of the friction damping plate 36 and presses on the damping spring 38, and during use, the auxiliary sliding plate 33 at both ends of the buffer main seat 31 drives the damping sliding plate 37 to slide in the friction damping plate 36 to compress the damping spring 38, so as to further enhance the damping effect.

[0047] In use, the buffer main seat 31 and the damping seat 32 are supported by the hydraulic damping 35 and the buffer spring 34, the transformer box 1 is installed on the buffer main seat 31 and supported by the damping seat 32 and the installation cross frame 16 in the use position, the vibration generated in use is buffered and damped by the buffer spring 34 and the hydraulic damping 35, and at the same time, the damping slide plate 312 moves in the inclined damping slide groove 311 when sliding due to vibration, the friction damping is damped, the damping spring 313 is supported to strengthen the friction damping effect, and the auxiliary slide plate 33 drives the damping slide plate 37 at one end to slide in the friction damping plate 36 and press on the damping spring 38 to buffer the damping effect better.

[0048] Example two: please refer to Figures 1 to 9 As shown in the drawings, on the basis of example one, the inner side of the main box 11 is provided with an inner frame body 17, the upper side of the inner frame body 17 is provided with a core coil 19, the upper end of the core coil 19 is provided with a clamping plate 18, the upper end of the main box 11 is provided with an oil tank top plate 14 through an oil tank top frame 13, the four sides of the main box 11 are provided with oil tank side plates 12, one side of the main box 11 and the oil tank side plate 12 is provided with a mounting clamping plate 121 and a mounting clamping groove 122, a sealing gasket is arranged between the mounting clamping plate 121 and the mounting clamping groove 122, the mounting clamping plate 121 and the mounting clamping groove 122 are clamped with each other and fixed by bolts, in use, the oil tank side plate 12 is installed on the main box 11 through the clamping of the mounting clamping plate 121 and the mounting clamping groove 122 and fixed by bolts, and the sealing gasket is used to strengthen the sealing of the mounting clamping plate 121 and the mounting clamping groove 122, the outer side of the upper end of the main box 11 is fixedly provided with a lifting hook 15, the lifting hook 15 is located between the oil tank top frame 13 and the oil tank side plate 12, which is convenient for lifting and installing the transformer in use, the outer side of the clamping plate 18 is provided with a support column 191, the outer side of the inner frame body 17 is provided with a positioning clamping groove 172, one side of the oil tank side plate 12 is provided with a positioning convex strip 171, and the positioning clamping groove 172 is slidingly installed outside the positioning convex strip 171; the inner side of the main box 11 is provided with a support bottom plate 173, the upper side of the support bottom plate 173 is provided with a buffer pad 174, the buffer pad 174 is supported on the lower side of the inner frame body 17, the oil tank top plate 14 is pressed on the upper side of the clamping plate 18, the guide of the positioning convex strip 171 and the positioning clamping groove 172 ensures more stable installation, and the support bottom plate 173 and the buffer pad 174 support from the bottom, the upper side of the oil tank top plate 14 is provided with a sleeve, and the sleeve includes a core lead-out sleeve, a low-voltage sleeve and a high-voltage sleeve.

[0049] The working principle and use process of the present application: during assembly, the oil tank side plate 12 is installed on the main tank body 11 by the clamping of the installation clamping plate 121 and the installation clamping groove 122 and fixed by bolts, and the installation clamping plate 121 and the installation clamping groove 122 are sealed by the sealing gasket, then the inner frame body 17, the clamping plate 18 and the iron core coil 19 are assembled and installed in the transformer tank body 1, the installation is more stable through the guidance of the positioning convex strip 171 and the positioning clamping groove 172, and the bottom is supported through the support bottom plate 173 and the buffer pad 174, and the support column 191 supports the outside of the clamping plate 18, so that the installation and use are more stable, the oil tank top plate 14 is installed on the oil tank top frame 13 and pressed on the clamping plate 18 to keep stable, and during installation and use, the installation cross frame 16 is supported and fixed at the use position, during use, the oil in the transformer tank body 1 is discharged into the buffer oil box 27 through the communication pipe 26 due to the increase in volume caused by the increase in temperature, the heat sink 24 and the heat conduction seat 241 quickly absorb heat and dissipate heat outward, and at the same time, the cooling fan 29 operates to blow air to the heat sink 24 and the buffer oil box 27 to accelerate heat dissipation, after heat dissipation, the temperature decreases and the volume decreases, and the oil is sucked into the transformer tank body 1 from the buffer oil box 27 again through negative pressure, during heat dissipation, the cooling fan 29 is located on the installation cross frame 16, and the buffer damping of the damping mechanism 3 reduces the influence of vibration on the transformer tank body 1, when it rains during daily use, the rainwater flowing down from the heat sink 24 can wash away some dust, and the guide plate 232 and the blocking plate 233 guide and reduce the flow to the cooling fan 29, and the vibration generated during the use of the transformer is buffered and damped by the buffer spring 34 and the hydraulic damping 35, and when the buffer main seat 31 and the damping seat 32 relatively slide due to vibration, the damping slide plate 312 slides in the damping slide groove 311 to further dampen, and the damping slide plate 312 compresses the damping spring 313 to better dampen, and the auxiliary slide plate 33 at both ends of the buffer main seat 31 drives the damping slide plate 37 to slide in the friction damping plate 36 to compress the damping spring 38 when damping, thereby further reducing vibration.

[0050] It should be noted that, in the present document, the terms such as first and second, etc., are used merely to differentiate one entity or action from another, and do not necessarily require or imply any such actual relationship or order between such entities or actions. Moreover, the terms "comprising", "including" or any other variant are intended to cover non-exclusive inclusions, such that a process, method, article or apparatus that comprises a list of elements does not include only those elements in the list, but can also include other elements not expressly listed or inherent to such process, method, article or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article or apparatus that includes the element.

[0051] The above description is only to illustrate the technical solutions of the present application but not to limit the present application. Other modifications or equivalent replacements of the technical solutions of the present application made by those skilled in the art should be covered in the scope of claims of the present application as long as they are not deviated from the spirit and scope of the technical solutions of the present application.

Claims

1. A fabricated oil tank characterized by: The utility model relates to a kind of assembly type oil tank, including: Transformer tank (1) is composed of main tank (11), oil tank side plate (12), oil tank top frame (13) and oil tank top plate (14); Heat dissipation mechanism (2), including the heat dissipation frame (21) installed on the oil tank side plate (12), the ventilation seat (22) installed on the installation cross frame (16), the ventilation seat (22) is equipped with heat dissipation fan (29) in, the heat dissipation frame (21) is equipped with heat dissipation fin (24) and heat conduction seat (241), and the ventilation seat (22) is connected heat dissipation frame (21) by air guide cover (23) and bellows (231); Oil tank side plate (12) surface is equipped with oil tank support plate (25) and buffer oil box (27), and buffer oil box (27) is connected main tank (11) by communicating pipe (26); Damping mechanism (3), including buffer main seat (31) and damping seat (32), buffer main seat (31) is equipped with hydraulic damping (35) and buffer spring (34) in, and damping seat (32) is equipped with damping sliding plate (312) and damping spring (313) on both sides, and damping sliding plate (312) is matched with damping sliding groove (311) in buffer main seat (31); Friction damping plate (36) and damping spring (38) are equipped in installation cross frame (16); Buffer main seat (31) is equipped with auxiliary sliding plate (33) and damping sliding plate (37) on both ends, and damping sliding plate (37) is matched with friction damping plate (36) and slides. Heat dissipation fin (24) surface is equipped with heat dissipation vertical grain (242), and is arranged equidistantly and is attached to communicating pipe (26).

2. The fabricated fuel tank of claim 1, wherein: Air guide cover (23) is equipped with staggered arrangement guide plate (232) and barrier plate (233) in, and is matched with heat dissipation fan (29) position.

3. The fabricated fuel tank of claim 1, wherein: Damping sliding groove (311) is inclined structure, and is matched with damping sliding plate (312);Ventilation seat (22) lower end is equipped with filter screen (28).

4. The fabricated fuel tank of claim 1, wherein: The utility model relates to a kind of assembly type oil tank, including:

5. An oil immersed transformer characterized by: Main tank (11) is equipped with inner frame body (17) and iron core coil (19) in, and iron core coil (19) upper end is equipped with clamping plate (18);Oil tank side plate (12) is fixed by clamping and connecting with main tank (11) through installation clamping plate (121) and installation clamping groove (122). Main tank (11) upper end is equipped with lifting hook (15), and is located between oil tank top frame (13) and oil tank side plate (12).

6. An oil immersed transformer according to claim 5, characterised in that: Clamping plate (18) outside is equipped with support column (191);Inner frame body (17) outside is equipped with positioning clamping groove (172), and is matched with positioning convex strip (171) on oil tank side plate (12).

7. An oil immersed transformer according to claim 5, characterized in that: Main tank (11) bottom is equipped with support bottom plate (173) and buffer pad (174), and buffer pad (174) supports inner frame body (17);Oil tank top plate (14) is pressed and connected clamping plate (18).

8. An oil immersed transformer according to claim 5, characterized in that: Oil tank top plate (14) is equipped with iron core lead-out sleeve, low pressure sleeve and high pressure sleeve.

9. An oil immersed transformer as claimed in claim 5, wherein: ​

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