Oil-immersed transformer with protective structure

Abstract

The utility model discloses an oil-immersed transformer of a protection structure, the oil-immersed transformer of the protection structure comprises a box cover, a sleeve body and a fixed base, the sleeve body is detachably connected and fixed with the fixed base, the box cover is provided with a first sealing part, and the first sealing part is provided with a second sealing part. And the first sealing part is arranged on the outer wall of the fixed base, and a protective cover is arranged on the outer wall of the first sealing part. The protective cover, the protective sealing part and the first sealing part form a labyrinth type structure to prevent rainwater from invading, the protective sealing part is tightly connected with the sleeve body through the O-shaped rings, multiple layers of sealing structures are arranged at the connecting positions of the fixed base, the box cover and the sleeve body, a labyrinth type waterproof barrier is formed, damp air permeation is reduced, and even if a single O-shaped ring fails due to aging, rainwater can be prevented from entering the sleeve body. By means of the design, pollutants such as water and dust are effectively blocked, the stability of an internal insulating medium is kept, and medium leakage and external pollution backward flowing are completely eradicated.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to an oil-immersed transformer with a protective structure. Background Technology

[0002] The casing of an oil-immersed transformer contains insulating oil to absorb the heat generated during operation. This heat is then transferred to the heat sink on the casing for dissipation. The oil conservator in an oil-immersed transformer regulates the oil level in the transformer tank, ensuring the transformer remains fully filled with oil under all temperature and operating conditions. When the transformer oil temperature rises, the oil expands, and excess oil flows into the conservator; conversely, when the oil temperature drops, the oil shrinks, and the oil in the conservator flows back into the tank, thus automatically adjusting the oil level.

[0003] High-voltage bushings, as critical insulating components of transformers, suffer from structural sealing failures during long-term operation. Their composite insulation system gradually deteriorates under the influence of the operating environment, leading to micro-leakage channels at the connection between the bushing and the transformer tank cover. This results in the dual risks of slow leakage of insulating oil and reverse intrusion of external contaminants. Surface deposits form conductive pathways under varying humidity levels, reducing the equipment's ability to withstand sudden voltage surges. Furthermore, uneven moisture absorption due to environmental penetration within the internal multi-layered structure exacerbates the risk of localized electric field distortion. While current conventional protection methods can delay some problems, they fail to effectively block the process of dielectric degradation, exhibiting insufficient overall protective effectiveness. Therefore, the applicant has developed a beneficial design and found a solution to the aforementioned problems. The technical solution described below arose from this context. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the traditional oil-immersed transformer design and provide a product that prevents leakage and improves sealing.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] An oil-immersed transformer with a protective structure includes a tank cover, a bushing body, and a fixed base. The bushing body is detachably connected and fixed to the fixed base. The tank cover has a first sealing part disposed on the outer wall of the fixed base. A protective cover is provided on the outer wall of the first sealing part. The protective cover has a protective sealing part embedded between the bushing body and the first sealing part. The protective sealing part also applies a downward force to the fixed base, so that the fixed base and the tank cover are tightly abutted. A sealing gasket is provided between the fixed base and the tank cover and is embedded in the tank cover. At least one O-ring is provided between the protective sealing part and the bushing body, the protective cover and the first sealing part, and the fixed base and the inner wall of the bushing body.

[0007] Preferably, the first sealing part has a raised second sealing part that abuts against the sealing gasket, and the second sealing part has a through hole through which the conductive part of the sleeve body passes.

[0008] Preferably, the fixing base has a protrusion and fixing holes evenly distributed along the circumference of the protrusion. The back of the fixing hole is provided with a fastening screw, which is threaded to the sleeve body. The head of the fastening screw is flush with the surface of the fixing base.

[0009] Preferably, the sleeve body is provided with a sealing groove to accommodate the protrusion, and the O-ring is disposed between the sealing groove and the protrusion.

[0010] Preferably, the sealing gasket has a protective part embedded in a through hole, the protective part is also tightly fitted to the inner wall of the through hole, the protective part covers the entrance of the fixing hole, and the protective part has a wire hole.

[0011] Preferably, the protective cover has a plurality of screws evenly distributed along the circumference and threadedly connected to the cover, and the top of the protective cover has an inclined guide surface.

[0012] Preferably, the detachable type is configured as a fastening screw.

[0013] Beneficial effects:

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention utilizes a protective cover and a protective sealing part in conjunction with a first sealing part to form a labyrinthine sealing structure. The protective sealing part is tightly connected to the sleeve body via O-rings, effectively preventing rainwater erosion. Furthermore, multiple layers of sealing structures are set at the connection between the fixed base and the tank cover, and at the connection between the fixed base and the sleeve body, forming a labyrinthine waterproof sealing barrier. This significantly reduces the infiltration of external humid air into the oil tank, preventing it from reacting with the insulating oil. Moreover, even if a single O-ring ages due to long-term use, adjacent O-rings can automatically fill the failed area, forming a dynamic compensation mechanism. Through the above structural design, it effectively prevents the intrusion of external pollutants such as moisture and dust, while maintaining the stability of the internal insulating medium. This eliminates the risk of medium leakage and backflow of external pollution caused by seal failure, overcoming the technical problems proposed in the background art, and giving the product the advantages of leak prevention and improved sealing performance. Attached Figure Description

[0016] Figure 1 This is a side cross-sectional view of an oil-immersed transformer with a protective structure according to the present invention.

[0017] Figure 2 This utility model Figure 1 A partial enlarged view A of an oil-immersed transformer with a protective structure;

[0018] Figure 3 This is an exploded view of an oil-immersed transformer with a protective structure according to the present invention.

[0019] The correspondence between the labels and component names in the attached figures is as follows:

[0020] Reference numerals: 1. Cover; 2. Sleeve body; 3. Fixing base; 4. Sealing gasket; 5. Protective cover; 6. O-ring; 7. Screw; 8. Fastening screw; 11. First sealing part; 12. Second sealing part; 13. Through hole; 21. Sealing groove; 31. Protrusion; 32. Fixing hole; 41. Protective part; 42. Wire hole; 51. Protective sealing part; 52. Guide surface. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0024] Reference example Figures 1 to 3An oil-immersed transformer with a protective structure includes a tank cover 1, a bushing body 2, and a fixed base 3. The bushing body 2 is detachably connected and fixed to the fixed base 3. The tank cover 1 is provided with a first sealing part 11 and is disposed on the outer wall of the fixed base 3. The outer wall of the first sealing part 11 is provided with a protective cover 5. The protective cover 5 is provided with a protective sealing part 51 and is embedded between the bushing body 2 and the first sealing part 11. The protective sealing part 51 also applies a downward force to the fixed base 3, so that the fixed base 3 and the tank cover 1 are tightly abutted. A sealing gasket 4 is provided between the fixed base 3 and the tank cover 1 and is embedded in the tank cover 1. At least one O-ring 6 is provided between the protective sealing part 51 and the bushing body 2, between the protective cover 5 and the first sealing part 11, and between the fixed base 3 and the inner wall of the bushing body 2.

[0025] The protective cover 5 and the protective sealing part 51, together with the first sealing part 11, form a labyrinth-type sealing structure. The protective sealing part 51 is tightly connected to the sleeve body 2 through the O-ring 6, effectively blocking rainwater erosion. In addition, the connection between the fixed base 3 and the box cover 1, and the connection between the fixed base 3 and the sleeve body 2, are provided with a multi-layer sealing structure to form a labyrinth-type waterproof sealing barrier, which greatly reduces the penetration of external humid air into the oil tank and prevents it from reacting with the insulating oil. Furthermore, even if a single O-ring 6 ages due to long-term use, the adjacent O-ring 6 can still automatically fill the failed area, forming a dynamic compensation mechanism. Through the above structural design, the intrusion of external pollutants such as moisture and dust is effectively blocked, while maintaining the stability of the internal insulating medium. This eliminates the risk of medium leakage and external pollution backflow caused by sealing failure, overcomes the technical problems proposed in the background art, and makes the product have the advantages of leak prevention and improved sealing performance.

[0026] It is worth mentioning that the first sealing part 11 is provided with a raised second sealing part 12, which abuts against the sealing gasket 4. The second sealing part 12 is provided with a through hole 13 for the conductive part of the sleeve body 2 to pass through.

[0027] It is worth mentioning that the fixed base 3 is provided with a protrusion 31 and a fixing hole 32, which are evenly distributed along the circumference of the protrusion 31. The back of the fixing hole 32 is provided with a fastening screw 8, which is threaded to the sleeve body 2. The head of the fastening screw 8 is flush with the surface of the fixed base 3.

[0028] It is worth mentioning that the sleeve body 2 is provided with a sealing groove 21 to accommodate the protrusion 31, and the O-ring 6 is disposed between the sealing groove 21 and the protrusion 31. The protrusion 31 and the sealing groove 21 form a labyrinth-type sealing structure, which generates multiple tortuous small sealing chambers, thereby reducing leakage. In conjunction with the O-ring 6, leakage is further prevented.

[0029] It is worth mentioning that the sealing gasket 4 is provided with a protective part 41 and embedded in the through hole 13. The protective part 41 is also tightly attached to the inner wall of the through hole 13. The protective part 41 covers the entrance of the fixing hole 32. The protective part 41 is provided with a wire hole 42. The protective part 41 and the through hole 13 form a labyrinth-like sealing structure, which further prevents external humid air from penetrating into the fuel tank.

[0030] It is worth mentioning that the protective cover 5 is provided with several screws 7 evenly distributed along the circumference and threaded to the cover 1. The top of the protective cover 5 is provided with an inclined guide surface 52. The first sealing part 11 is provided between the protective sealing part 51 and the protective cover 5, thus forming a labyrinth-like sealing structure, creating multiple tortuous small sealing chambers to prevent external humid air from entering. In addition, the guide surface 52 prevents rainwater from accumulating on the top of the protective cover 5, causing it to slide off quickly under gravity.

[0031] It is worth mentioning that the detachable fastening screw 8 is used. Before the sleeve body 2 is connected to the box cover 1, the protective cover 5 is first put on the outer wall of the sleeve body 2, and then the fixing base 3 is connected and fixed to the sleeve body 2. Next, the sealing gasket 4 is placed on the second sealing part 12. Finally, the assembled sleeve body 2 and the protective cover 5 are embedded into the first sealing part 11. Finally, the screw 7 on the protective cover 5 is tightened. The clamping force is passed through the fixing base 3 to connect and fix the sleeve body 2 to the box cover 1.

[0032] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. An oil-immersed transformer of the shielded type comprising a tank cover (1), a bushing body (2), a fixed base (3), characterized in that: The device includes a lid (1), a sleeve body (2), and a fixed base (3). The sleeve body (2) is detachably connected and fixed to the fixed base (3). The lid (1) is provided with a first sealing part (11) and is located on the outer wall of the fixed base (3). The outer wall of the first sealing part (11) is provided with a protective cover (5). The protective cover (5) is provided with a protective sealing part (51) and is embedded between the sleeve body (2) and the first sealing part (11). The protective sealing part (51) also applies a downward force to the fixed base (3) so that the fixed base (3) and the lid (1) are tightly abutted. A sealing gasket (4) is provided between the fixed base (3) and the lid (1) and is embedded in the lid (1). At least one O-ring (6) is provided between the protective sealing part (51) and the sleeve body (2), the protective cover (5) and the first sealing part (11), and the fixed base (3) and the inner wall of the sleeve body (2).

2. The oil immersed transformer of the shield structure according to claim 1, characterized in that: The first sealing part (11) has a raised second sealing part (12) that abuts against the sealing gasket (4). The second sealing part (12) has a through hole (13) through which the conductive part of the sleeve body (2) passes.

3. The oil immersed transformer of the shielded construction according to claim 2, characterized in that: The fixed base (3) is provided with a protrusion (31) and a fixing hole (32) is provided, which are evenly distributed along the circumference of the protrusion (31). The back of the fixing hole (32) is provided with a fastening screw (8), which is threaded to the sleeve body (2). The head of the fastening screw (8) is flush with the surface of the fixed base (3).

4. The oil immersed transformer of the shielded construction according to claim 3, characterized in that: The sleeve body (2) is provided with a sealing groove (21) for accommodating the protrusion (31), and the O-ring (6) is disposed between the sealing groove (21) and the protrusion (31).

5. The oil immersed transformer of the shielded construction according to claim 3, characterized in that: The sealing gasket (4) is provided with a protective part (41) and embedded in the through hole (13). The protective part (41) is also tightly attached to the inner wall of the through hole (13). The protective part (41) covers the entrance of the fixing hole (32). The protective part (41) is provided with a wire hole (42).

6. The oil immersed transformer of the shielded construction according to claim 1, characterized in that: The protective cover (5) is provided with a number of screws (7) evenly distributed along the circumference and threaded to the box cover (1). The top of the protective cover (5) is provided with an inclined guide surface (52).

7. The oil immersed transformer of the shielded construction according to claim 3, characterized in that: The detachable type is configured as a fastening screw (8).

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