Oil-immersed transformer
By designing a clamping mechanism fixing coil in an oil-immersed transformer and combining an efficient heat dissipation device, the problems of unsolid fixing of the coil and poor heat dissipation effect are solved, and more stable coil fixing and better heat dissipation effect are achieved, improving the operating reliability of the transformer.
Patent Information
- Application Number
- CN202420413010.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-03-04
AI Technical Summary
The coils of existing oil-immersed transformers are not fixed firmly, which are easily damaged due to running wear, and the plane coil core is exposed and easily damaged, and the heat dissipation effect is poor, resulting in unreliable operating conditions.
An oil-immersed transformer including an oil tank shell, bottom plate, cover plate and coil is designed. The coil is fixed using a clamping mechanism, and the internal heat dissipation frame and external rear wall heat dissipation ribs are combined with a phase-change heat pipe radiator or semiconductor heat exchange unit to improve the heat dissipation effect.
Through the design of the clamping mechanism, the coil and the plane coil core are more securely fixed, avoiding damage caused by running wear, improving the heat dissipation effect, and improving the operating reliability of the transformer.
Smart Images
Figure CN222562419U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power transformers, in particular to an oil-immersed transformer. Background Art
[0002] At present, the internal coils of ordinary oil-immersed transformers are not firmly fixed. The coils will collide with each other during the operation of the transformer, causing wear and cracking. The coils are not placed stably, and the coils will move forward and backward during the operation of the transformer, causing wear. The flat coil core is exposed outside, and the shaking during the operation of the transformer is very easy to damage the flat coil core, and the flat coil core cannot be better fixed. The oil tank of the transformer is mostly made of aluminum alloy. If the connecting rod is made of aluminum alloy, the clamp will break due to the long-term operation of the transformer, which is more likely to cause damage to the internal coils. The existing technical solution, such as the oil-immersed transformer disclosed in the publication (publication) number CN214624682U, has two coils with hollow bottoms, and there is no device in the middle to cover the core for protection, which leads to greater wear on the core. In addition, due to the reason of the core angle iron, the core material is more, and the body weight is heavier, resulting in a larger total weight and volume of such oil-immersed transformers, which increases the material cost of the transformer, is not conducive to installation and transportation, and is affected by the poor thermal conductivity of the aluminum alloy, the heat dissipation effect of the transformer is not good, and the operation state is unreliable. Utility Model Content
[0003] The purpose of the utility model is to provide an oil-immersed transformer to solve the problems raised in the above background technology.
[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0005] An oil-immersed transformer, comprising:
[0006] Fuel tank shell, fuel tank bottom plate, fuel tank cover plate and coil;
[0007] The upper and lower ends of the oil tank shell are in an open state;
[0008] The fuel tank cover plate is mounted on the upper edge of the fuel tank shell and matches the fuel tank shell;
[0009] The oil tank bottom plate is mounted on the lower edge of the oil tank shell and matches the oil tank shell;
[0010] The coil is symmetrically installed inside the oil tank shell, and a clamping mechanism for fixing the coil and taking the coil out of the oil tank shell during maintenance is installed inside the oil tank shell.
[0011] Preferably, the clamping mechanism includes a transformer box inner shell, a flat coil core, a transformer box cover, a transformer cover lifting block, a coil fixing frame, a transformer box outer baffle, a baffle door frame upper clamp and a baffle door frame lower clamp;
[0012] The transformer box inner shell is arranged inside the oil tank outer shell and matches the shape of the oil tank outer shell;
[0013] The transformer box cover is arranged on the upper part of the transformer box inner shell and matches the transformer box inner shell;
[0014] The transformer cover lifting blocks are arranged on both sides above the transformer box cover;
[0015] The flat wound core is sleeved on the upper and lower ends of the coil;
[0016] The coil fixing frame is clamped on both sides of the coil;
[0017] The external baffle of the transformer box is arranged in front of the coil fixing frame;
[0018] The upper clamping piece of the door-blocking door frame and the lower clamping piece of the door-blocking door frame are respectively arranged in front of both sides of the coil fixing frame.
[0019] Preferably, the clamping mechanism includes a transformer box inner shell, a flat coil core, a transformer box cover, a transformer cover lifting block, a transformer box internal coil fixing frame, a transformer box external baffle, a baffle door frame upper clamp and a baffle door frame lower clamp;
[0020] The transformer box inner shell is installed inside the oil tank outer shell;
[0021] The transformer box cover is installed on the upper part of the transformer box inner shell and matches the transformer box inner shell;
[0022] The transformer cover lifting blocks are arranged on both sides above the transformer box cover;
[0023] The flat wound core is sleeved on the upper and lower ends of the coil;
[0024] The transformer box cover is connected to the coil fixing frame inside the transformer box as a whole;
[0025] The transformer box external baffle is installed at the front middle part of the outer shell of the transformer box;
[0026] The upper clamp of the door-blocking door frame and the lower clamp of the door-blocking door frame are installed on both sides of the middle part of the front of the inner shell of the transformer box, and are used to clamp the external baffle of the transformer box.
[0027] Preferably, it also includes a coil shelf, an upper copper frame for fixing the flat coil core, a lower copper frame for fixing the flat coil core, and a fixed baffle in front of the flat coil core;
[0028] The coil is placed on the upper part of the oil tank bottom plate and is integrated with the inner shell of the transformer box;
[0029] The copper frame above the flat wound core is installed on the upper inner side of the rear wall of the transformer box inner shell;
[0030] The copper frame below the flat coil core is installed on the upper part of the oil tank bottom plate, and the copper frame below the flat coil core is parallel to the height of the coil shelf;
[0031] The fixed baffle in front of the flat wound core is arranged in front of the copper frame above the flat wound core, located on the upper part of the baffle outside the transformer box, and is detachable.
[0032] Preferably, it also includes fixing blocks on both sides above the coil, a coil partition, a rubber gasket and an elliptical copper block in the middle of the connecting rod;
[0033] The fixing blocks on both sides above the coil are installed on the upper parts of both sides of the coil;
[0034] The coil partition is arranged in the middle part of the coil;
[0035] The rubber gasket is installed on both sides of the rear baffle of the transformer box body, and is tightly connected with the internal coil. The rubber gasket is arranged in the middle part of the inner side of the rear wall of the inner shell of the transformer box body, and is tightly connected with the coil.
[0036] The elliptical copper block in the middle of the connecting rod is installed in the middle part of the connecting rods on both sides inside the fixed frame of the transformer box.
[0037] Preferably, it also includes a front baffle of the lower flat rolled core, a transformer inner shell fixing block and a transformer inner shell fixing bolt;
[0038] The front baffle of the lower flat coil core is installed at the front part of the copper frame below the flat coil core, and is hinged with the coil shelf in a hinged manner;
[0039] The transformer box inner shell fixing blocks are installed on both sides of the transformer box inner shell;
[0040] The transformer inner shell fixing bolts are installed inside the oil tank outer shell, and the four corners of the transformer inner shell fixing block are located on the upper part of the oil tank bottom plate.
[0041] Preferably, it also includes a fuel tank cover plate lifting block, a high-pressure bushing, a low-pressure bushing and a fuel tank closing plate;
[0042] The fuel tank cover lifting blocks are installed on both sides above the fuel tank cover;
[0043] The high-pressure bushing and the low-pressure bushing are arranged on both sides of the center above the fuel tank cover;
[0044] The oil tank fixing seat is installed on both sides below the oil tank bottom plate;
[0045] The oil tank bottom plate is installed on the front edge of the oil tank shell and matches the oil tank shell, so that the entire oil-immersed transformer is closed.
[0046] Compared with the prior art, the technical effects and advantages of the utility model are: the flat wound core and the internal coil of the utility model are more firmly fixed, the internal coil of the transformer will not be squeezed and deformed due to long-term operation, and the heat dissipation of the transformer during operation is more smooth.
[0047] 1. The internal coil clamping mechanism is used to protect the transformer from damage and wear during operation. A clamping mechanism for fixing the coil and removing the coil from the oil tank shell during maintenance is installed inside the oil tank shell. The clamping mechanism is characterized in that it includes a coil shelf, a middle fixing plate for bilaterally symmetrical coils, upper fixing blocks on both sides of the bilaterally symmetrical coils, an upper fixing copper frame, and a lower fixing copper frame.
[0048] 2. The transformer heat dissipation device includes an internal heat dissipation frame and external rear wall heat dissipation ribs, and also includes a phase change heat pipe radiator or a semiconductor heat exchange unit, wherein the heat sink is closely attached to the side of the oil tank shell wall to conduct the heat of the transformer oil in the oil tank, and utilizes the heat dissipation capacity of the phase change heat pipe radiator or the semiconductor heat exchange unit, the cold end is connected to the heat dissipation fins on the heat sink, the hot end is connected to a heat dissipation block, and the heat dissipation is enhanced by forced convection heat exchange, so that the heat conduction of the heat sink is faster and the heat dissipation effect is better. BRIEF DESCRIPTION OF THE DRAWINGS
[0049] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0050] Figure 2 This is a schematic diagram of the internal structure of the oil-immersed transformer of the utility model;
[0051] Figure 3 This is a schematic diagram of the internal structure of an oil-immersed transformer of the utility model;
[0052] Figure 4 It is a schematic top view of the partial structure of the oil-immersed transformer of the utility model;
[0053] Figure 5 This is another schematic diagram of the internal structure of the oil-immersed transformer of the utility model;
[0054] Figure 6This is a schematic diagram of the coil fixing frame inside the transformer box of the utility model oil-immersed transformer;
[0055] Figure 7 The utility model oil-immersed transformer shows a schematic diagram of an elliptical copper block in the middle of an internal connecting rod.
[0056] In the figure: 1. Oil tank shell; 2. Oil tank fixing seat; 4. Transformer inner shell fixing block; 5. Coil; 6. Transformer inner shell fixing bolt; 7. Transformer box external baffle; 8. Baffle door lock; 9. Transformer cover lifting block; 10. Rubber gasket; 11. Rear wall heat dissipation ribs; 12. Flat rolled iron core fixing lower copper frame; 13. Flat rolled iron core; 14. Transformer box internal coil fixing frame; 15. Flat rolled iron core fixing upper copper frame; 16. Transformer box cover; 1 7. Oil tank bottom plate; 19. Coil shelf; 20. Fixed baffle in front of flat coil core; 21. Upper clamp of baffle door frame; 22. Lower clamp of baffle door frame; 25. Coil partition; 26. Oil tank closing plate; 27. Fixed blocks on both sides above the coil; 28. Oval copper block in the middle of connecting rod; 29. Low-voltage bushing; 30. High-voltage bushing; 31. Oil tank cover; 32. Oil tank cover lifting block; 33. Inner shell of transformer box; 34. Coil fixing frame; 35. Baffle in front of flat coil core. DETAILED DESCRIPTION
[0057] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0058] See also Figures 1 to 7 , the utility model provides a technical solution:
[0059] An oil-immersed transformer, comprising:
[0060] The fuel tank housing 1, the fuel tank bottom plate 17, the fuel tank cover plate 31 and the coil 5;
[0061] The upper and lower ends of the oil tank housing 1 are in an open state;
[0062] The fuel tank cover plate 31 is mounted on the upper edge of the fuel tank shell 1 and matches the fuel tank shell 1 .
[0063] The oil tank bottom plate 17 is mounted on the lower edge of the oil tank shell 1 and matches the oil tank shell 1 .
[0064] The coil 5 is symmetrically installed inside the oil tank housing 1. A clamping mechanism is installed inside the oil tank housing 1 for fixing the coil 5 and removing the coil 5 from the oil tank housing 1 during maintenance.
[0065] like Figure 2 As shown, the clamping mechanism includes a transformer box inner shell 33, a flat wound core 13, a transformer box cover 16, a transformer cover lifting block 9, a coil fixing frame 34, a transformer box outer baffle 7, a door baffle frame upper clamp 21 and a door baffle frame lower clamp 22.
[0066] The transformer box inner shell 33 is arranged inside the oil tank shell 1 and matches the shape of the oil tank shell 1.
[0067] The transformer box cover 16 is disposed on the upper portion of the transformer box inner shell 33 and matches the transformer box inner shell 33 .
[0068] The transformer cover lifting blocks 9 are installed on both sides of the upper part of the transformer box cover 16. When the coil 5 is taken out for maintenance, it is more labor-saving and convenient to lift the upper cover 16.
[0069] The planar wound core 13 is sleeved on the upper and lower ends of the coil 5 .
[0070] The coil fixing frame 34 is clamped on both sides of the coil 5 .
[0071] The transformer box external baffle 7 is arranged in front of the coil fixing frame 34 .
[0072] The door-blocking door frame upper clamp 21 and the door-blocking door frame lower clamp 22 are respectively arranged in front of both sides of the coil fixing frame 34 .
[0073] The above is the clamping mechanism of the rotational limiting coil 5.
[0074] like Figure 5 As shown, the clamping mechanism includes an inner shell 33 of a transformer box, a flat wound core 13, a transformer box cover 16, a transformer cover lifting block 9, an internal coil fixing frame 14 of the transformer box, an external baffle 7 of the transformer box, an upper clamp 21 of a baffle door frame and a lower clamp 22 of a baffle door frame.
[0075] The transformer box inner shell 33 is installed inside the oil tank shell 1.
[0076] The transformer box cover 16 is installed on the upper part of the transformer box inner shell 33 and matches the transformer box inner shell 33 .
[0077] The transformer cover lifting blocks 9 are installed on both sides of the upper part of the transformer box cover 16. When the coil 5 is taken out for maintenance, it is more labor-saving and convenient to lift the upper cover 16.
[0078] The planar wound core 13 is sleeved on the upper and lower ends of the coil 5 .
[0079] like Figure 6 As shown, the transformer box cover 16 is connected to the internal fixing frame 14 of the transformer coil as a whole. When taking out the internal coils 5 on both sides for maintenance, it is necessary to lift the upper transformer box cover 16 together with the internal fixing frame 14 of the transformer coil upward, and the front is blocked by the external baffle 7 of the transformer box. The external baffle 7 of the transformer box is installed in the middle part of the front outside of the inner shell 33 of the transformer box.
[0080] The upper clamp 21 of the door blocking door frame and the lower clamp 22 of the door blocking door frame are installed on both sides of the middle part of the front of the inner shell of the transformer box, and are used to clamp the outer baffle of the transformer box.
[0081] The above is a clamping mechanism for the detachable limiting coil 5 .
[0082] According to the improved scheme, the external oil tank shell 1 and the internal transformer box inner shell 33 have the same structure, both of which are rectangular blocks, but are not limited to rectangular blocks.
[0083] The oil-immersed transformer comprises a coil shelf 19, an upper copper frame 15 for fixing the flat wound core, a lower copper frame 12 for fixing the flat wound core and a front fixed baffle 20 for the flat wound core.
[0084] A coil 5 placement rack can be installed on the top of the oil tank bottom plate 17, so that the coil 5 can be placed more firmly and will not be worn or damaged for a long time because the coil will not swing left and right when the transformer is running.
[0085] In order to protect the upper and lower planar wound cores 13 of the coils 5 on both sides, the utility model installs a planar wound core on the upper inner part of the transformer shell to place the planar wound core fixing upper copper frame 15, so that the planar wound core 13 will not be exposed to the outside, causing swinging during operation and wear and fracture. In addition, a planar wound core fixing lower copper frame 12 is also installed inside the coil shelf 19 on the upper part of the lower bottom plate, so that the planar wound core fixing lower copper frame 12 is highly parallel to the coil shelf 19, and the coil 5 will not be placed unstably. The above-mentioned planar wound core fixing lower copper frame 12 has a hollow middle part, so that the planar wound cores 13 on both sides can pass through the center part, which can better protect the internal planar wound core 13 from being broken due to wear and tear during long-term operation.
[0086] The front fixed baffle plate 20 of the flat wound core is arranged in front of the copper frame 15 above the flat wound core, located on the upper part of the outer baffle plate 7 of the transformer box, and is detachable.
[0087] It also includes fixing blocks 27 on both sides above the coil, a coil partition 25, a rubber gasket 10 and an elliptical copper block 28 in the middle of the connecting rod.
[0088] like Figure 4 As shown, the transformer inner shell fixing block 4 is installed on both sides of the transformer box body, and the transformer inner shell fixing bolts 6 are installed on the upper part of the oil tank bottom plate 17, connected around the transformer inner shell fixing block 4, and formed with the transformer to form a hinge, so that the internal integral transformer box inner shell 33 is fixed more firmly.
[0089] The external baffle plate 7 of the transformer box is arranged in front of the oil-immersed transformer. The external baffle plate 7 of the transformer box is connected to the front part of the coil fixing frame 34. Two rubber washers 10 are installed on both sides of the rear of the external baffle plate 7 of the transformer box, so that the rubber washers 10 are tightly pressed in front of the internal coil 5, and the coil 5 will not collide. In addition, two rubber washers 10 are also installed in the middle part of the inner rear wall of the transformer shell to fix the coil 5 more firmly.
[0090] like Figure 7 As shown, an elliptical copper block in the middle of the connecting rod is installed inside the baffle. The purpose of installing the elliptical copper block 28 in the middle of the connecting rod is to increase the force-bearing area of the coil 5 when a collision occurs during the operation of the transformer, thereby reducing the degree of damage to the coil.
[0091] The coil placement rack includes a lower flat core front baffle 35, a transformer inner shell fixing block 4 and a transformer inner shell fixing bolt 6.
[0092] The front baffle door 35 of the lower flat coil core is installed at the front part of the copper frame 12 below the flat coil core, and is hinged with the coil shelf 19 in a hinged manner.
[0093] The transformer inner shell fixing block 4 is installed on both sides of the transformer box body, and the transformer inner shell fixing bolts 6 are installed on the upper part of the oil tank bottom plate 17, connected around the transformer inner shell fixing block 4, and formed with the transformer to form a hinge, so that the internal integral transformer box inner shell 33 is fixed more firmly.
[0094] The transformer inner shell fixing bolts 6 are installed inside the oil tank outer shell 1 , and the four corners of the transformer inner shell fixing block 4 are located on the upper part of the oil tank bottom plate 17 .
[0095] like Figure 1 As shown, the fuel tank housing includes a fuel tank cover plate lifting block 32, a high-pressure bushing 30, a low-pressure bushing 29, a fuel tank closing plate 26, and a fuel tank fixing seat 2.
[0096] The oil-immersed transformer can be provided with two oil tank cover lifting blocks 32 on both sides of the oil tank cover 31 to facilitate the removal of the oil tank cover 31. In order to fix it firmly, two high-voltage bushings 30 and a low-voltage bushing 29 are placed on the upper part of the cover. In order to protect the transformer from internal short circuit during operation so that the transformer cannot operate normally, an oil tank closing plate 26 is placed in front of the overall transformer box so that the transformer box cover 16 will not be displaced during the operation of the overall transformer, resulting in wear and damage to the transformer.
[0097] The remaining parts not described in this utility model are existing or known technologies.
[0098] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An oil-immersed transformer, characterized in that: include: A fuel tank housing (1), a fuel tank bottom plate (17), a fuel tank cover plate (31) and a coil (5); The upper and lower ends of the oil tank shell (1) are in an open state; The fuel tank cover plate (31) is mounted on the upper edge of the fuel tank shell (1) and matches the fuel tank shell (1); The oil tank bottom plate (17) is mounted on the lower edge of the oil tank shell (1) and matches the oil tank shell (1); The coil (5) is symmetrically mounted inside the oil tank shell (1), and a clamping mechanism is mounted inside the oil tank shell (1) for fixing the coil (5) and removing the coil (5) from the oil tank shell (1) during maintenance.
2. The oil-immersed transformer according to claim 1, characterized in that: The clamping mechanism comprises a transformer box inner shell (33), a flat coil core (13), a transformer box cover (16), a transformer cover lifting block (9), a coil fixing frame (34), a transformer box outer baffle (7), a baffle door frame upper clamp (21) and a baffle door frame lower clamp (22); The transformer box inner shell (33) is arranged inside the oil tank outer shell (1) and matches the shape of the oil tank outer shell (1); The transformer box cover plate (16) is arranged on the upper part of the transformer box inner shell (33) and matches the transformer box inner shell (33); The transformer cover lifting blocks (9) are arranged on both sides above the transformer box cover (16); The flat wound core (13) is sleeved on the upper and lower ends of the coil (5); The coil fixing frame (34) is clamped on both sides of the coil (5); The transformer box external baffle (7) is arranged in front of the coil fixing frame (34); The door-blocking door frame upper clamp (21) and the door-blocking door frame lower clamp (22) are respectively arranged in front of both sides of the coil fixing frame (34).
3. The oil-immersed transformer according to claim 1, characterized in that: The clamping mechanism comprises an inner shell of a transformer box (33), a flat coil core (13), a transformer box cover (16), a transformer cover lifting block (9), an internal coil fixing frame of the transformer box (14), an external baffle plate of the transformer box (7), an upper clamping piece of a baffle door frame (21) and a lower clamping piece of a baffle door frame (22); The transformer box inner shell (33) is installed inside the oil tank outer shell (1); The transformer box cover plate (16) is installed on the upper part of the transformer box inner shell (33) and matches the transformer box inner shell (33); The transformer cover lifting blocks (9) are arranged on both sides above the transformer box cover (16); The flat wound core (13) is sleeved on the upper and lower ends of the coil (5); The transformer box cover (16) is integrally connected to the coil fixing frame (14) inside the transformer box; The transformer box external baffle (7) is installed at the front middle part of the outside of the transformer box inner shell (33); The upper clamp (21) of the door blocking door frame and the lower clamp (22) of the door blocking door frame are installed on both sides of the middle part of the front of the transformer box inner shell (33) and are used to clamp the outer baffle (7) of the transformer box.
4. The oil-immersed transformer according to claim 2, characterized in that: It also includes a coil shelf (19), an upper copper frame (15) for fixing the flat coil core, a lower copper frame (12) for fixing the flat coil core, and a front fixed baffle (20) for fixing the flat coil core; The coil shelf (19) is arranged on the upper part of the oil tank bottom plate (17) and is integrated with the inner shell (33) of the transformer box; The copper frame (15) fixing the flat wound core is installed on the upper inner part of the rear wall of the transformer box inner shell (33); The copper frame (12) below the flat coil core is installed on the upper part of the oil tank bottom plate (17), and the copper frame (12) below the flat coil core is highly parallel to the coil shelf (19); The front fixed baffle plate (20) of the flat wound core is arranged in front of the copper frame (15) above the flat wound core and is located on the upper part of the outer baffle plate (7) of the transformer box.
5. The oil-immersed transformer according to claim 3, characterized in that: It also includes fixing blocks (27) on both sides above the coil, a coil partition (25), a rubber gasket (10) and an elliptical copper block (28) in the middle of the connecting rod; The fixing blocks (27) on both sides above the coil are installed on the upper parts of both sides of the coil (5); The coil partition (25) is arranged in the middle part of the coil (5); The rubber gasket (10) is installed on both sides of the rear of the outer baffle (7) of the transformer box, and is tightly connected with the internal coil (5); the rear rubber gasket is arranged in the middle of the inner side of the rear wall of the inner shell (33) of the transformer box, and is tightly connected with the coil (5); The elliptical copper block (28) in the middle of the connecting rod is installed in the middle parts of the connecting rods on both sides inside the coil fixing frame (14) inside the transformer box.
6. The oil-immersed transformer according to claim 4, characterized in that: It also includes a lower flat coil core front baffle (35), a transformer inner shell fixing block (4) and a transformer inner shell fixing bolt (6); The front baffle door (35) of the lower flat coil core is installed at the front part of the copper frame (12) below the flat coil core, and is hinged with the coil shelf (19) in a hinged manner; The transformer inner shell fixing blocks (4) are installed on both sides of the transformer box inner shell (33); The transformer inner shell fixing bolts (6) are installed inside the oil tank outer shell (1), and the four corners of the transformer inner shell fixing block (4) are located on the upper part of the oil tank bottom plate (17).
7. The oil-immersed transformer according to claim 1, characterized in that: It also includes a fuel tank cover plate lifting block (32), a high-pressure bushing (30), a low-pressure bushing (29), a fuel tank closing plate (26), and a fuel tank fixing seat (2); The fuel tank cover plate lifting blocks (32) are installed on both sides above the fuel tank cover plate (31); The high-pressure bushing (30) and the low-pressure bushing (29) are arranged on both sides of the center above the oil tank cover plate (31); The oil tank fixing seat (2) is installed on both sides below the oil tank bottom plate (17); The oil tank bottom plate (17) is installed at the front edge of the oil tank shell (1) and matches the oil tank shell (1), so that the entire oil-immersed transformer is closed.