Sealing structure of transformer box body

Abstract

The utility model belongs to the technical field of transformers, and particularly relates to a transformer box body sealing structure. A fuel tank body; the sealing structure comprises a fastening assembly used for connecting the oil tank cover and the oil tank body; the sealing assembly is used for sealing the oil tank cover and the oil tank body; wherein the fastening assembly is a replaceable part, and the oil tank cover and the oil tank body cannot be damaged when the fastening assembly is assembled and disassembled. The oil tank has the beneficial effects that by designing the replaceable fastening assembly, it is ensured that connection between the oil tank cover and the oil tank body is still stable and reliable after multiple times of disassembly and reinstallation, the problem of fastening failure caused by thread abrasion is avoided, the oil tank cover and the oil tank body cannot be damaged, and the service life of the oil tank cover and the oil tank body is prolonged. And the overall service life of the transformer box body is prolonged.

Description

Technical Field

[0001] This application belongs to the field of transformer technology, and in particular relates to a transformer housing sealing structure. Background Technology

[0002] The oil tank is an important component of a liquid-immersed transformer, serving to house the entire transformer body. Its sealing performance is crucial; a poorly sealed tank can allow impurities such as moisture and dust to seep into the transformer oil, reducing its insulating properties.

[0003] Patent CN219457300U discloses a transformer tank sealing structure, including a tank cover, a semi-circular head square neck bolt, a sealing gasket, and a bolt sealing gasket; the sealing gasket and the bolt sealing gasket are provided between the tank cover and the tank body; the tank cover and the tank body have a first upward bending part at the end of the sealing gasket near the tank, and the upward bending angle of the first bending part of the tank body is greater than that of the first bending part of the tank cover.

[0004] The two inclined planes of the above patent abut against each other and are fastened by bolts. Although the fastening effect can be achieved, the fastening effect is poor due to the reliance on bolts and nuts alone. Moreover, the threads are prone to wear after repeated disassembly, making it impossible to fasten properly. Therefore, improvements are needed. Summary of the Invention

[0005] The purpose of this application is to provide a transformer enclosure sealing structure that can solve the above-mentioned problems.

[0006] The purpose of this application is to provide a transformer enclosure sealing structure, including:

[0007] Fuel tank cap;

[0008] Fuel tank body;

[0009] A sealing structure, the sealing structure comprising:

[0010] Fastening components are used to connect the fuel tank cover to the fuel tank body;

[0011] A sealing assembly used to seal the fuel tank cover and the fuel tank body;

[0012] The fastening components are replaceable and will not cause damage to the fuel tank cover or fuel tank body during installation and removal.

[0013] The aforementioned transformer enclosure sealing structure uses a tank cover as the top cover of the transformer enclosure to seal it and prevent external impurities and moisture from entering. The tank enclosure is the main housing part of the transformer, used to install the transformer body and related components, ensuring the transformer operates in a safe environment. Fastening components connect the tank cover and the tank enclosure, achieving a secure connection. The fastening components in this application are designed as replaceable parts; even after prolonged use or repeated disassembly, if the fastening effect decreases or wear occurs, new fastening components can be easily replaced without requiring a major overhaul or replacement of the entire sealing structure. The sealing component is located between the tank cover and the tank enclosure, filling the small gap between them to prevent oil leakage or the entry of external impurities. It is made of high-performance sealing material, possessing excellent oil resistance, temperature resistance, and aging resistance, ensuring the sealing performance of the transformer enclosure during long-term operation.

[0014] By designing replaceable fastening components, the connection between the tank cover and the tank body remains secure and reliable after multiple disassemblies and reinstallations. This avoids fastening failures caused by thread wear and prevents damage to the tank cover and tank body, thus extending the overall service life of the transformer enclosure. The sealing components, made with high-performance sealing materials, effectively prevent oil leakage and the ingress of external impurities, ensuring a clean and safe internal environment for the transformer enclosure.

[0015] Furthermore, the fastening assembly includes:

[0016] An installation protrusion is provided on the fuel tank cover, and a first through hole is provided inside the protrusion, which extends to the bottom of the fuel tank cover.

[0017] The second through hole is provided on the tank body and corresponds to the position of the first tank body;

[0018] Fastening bolts; nuts that fit the fastening bolts are provided at the bottom of the fuel tank body.

[0019] The threaded end of the fastening bolt passes through the first through hole and the second through hole in sequence before engaging with the nut.

[0020] The mounting protrusion is located at a specific position on the fuel tank cover. It contains a first through hole extending from the top to the bottom of the fuel tank cover, providing a channel for the fastening bolts. This not only enhances the mechanical strength of the fuel tank cover but also extends the fastening distance, thereby improving the tightening effect. A second through hole corresponds to the first through hole and is located on the fuel tank body. When the fuel tank cover and fuel tank body are accurately aligned, the first and second through holes will perfectly align. The threaded end of the fastening bolt is designed to pass through the first and second through holes sequentially and engage with the nut at the bottom of the fuel tank body. The fastening connection between the fuel tank cover and the fuel tank body is achieved by rotating the bolt.

[0021] The fastening components not only ensure a secure connection between the fuel tank cover and the fuel tank body, preventing loosening or leakage caused by vibration or external forces, but their replaceability also greatly reduces maintenance costs and difficulty. Even if the fastening effect decreases or wear occurs after long-term use or multiple disassemblies, new fastening components can be easily replaced without overhauling or replacing the entire sealing structure.

[0022] Furthermore, the fastening assembly also includes a mounting cap disposed on the mounting protrusion, the surface of which has a third through hole through which a fastening bolt passes and communicates with the first through hole.

[0023] The mounting cap is positioned on top of the mounting protrusion and mates with it via a threaded connection. A third through hole is formed on the surface of the mounting cap, which not only connects to the first through hole inside the mounting protrusion but also provides a smoother passage for the fastening bolt. The mounting cap also serves as an isolation and protection mechanism, preventing direct contact between the bolt head and the surface of the fuel tank cover during bolt installation and removal. This avoids damage caused by friction or impact, protecting the surface integrity of the fuel tank cover and extending the service life of the fastening components.

[0024] In addition, the mounting cap provides a more stable support point for the fastening bolt. During the bolt tightening process, the mounting cap ensures that the threaded end of the bolt can accurately and stably pass through the first and second through holes and fit tightly with the nut at the bottom, further enhancing the fastening effect and stability of the fastening assembly.

[0025] Furthermore, the diameter of the third through hole is the same as the diameter of the fastening bolt, and the diameters of the first through hole and the second through hole are the same. The diameters of both are larger than the diameter of the fastening bolt, forming an isolation gap.

[0026] The diameter of the third through hole is set to be the same as the diameter of the fastening bolt, ensuring that the fastening bolt can pass smoothly through the third through hole while preventing the fastening bolt from shifting during installation. The diameters of the first and second through holes are larger than the diameter of the fastening bolt, forming an isolation gap. This gap effectively prevents the threaded part of the bolt from directly contacting the inner wall of the through hole after the fastening bolt is inserted, reducing the possibility of thread wear and improving the durability and stability of the fastening assembly.

[0027] Furthermore, an outer fastening ring is provided on the outer wall of the fastening bolt, an inner fastening ring is provided on the inner wall of the second through hole, and a spring is provided between the outer fastening ring and the inner fastening ring, with the spring sleeved on the outside of the fastening bolt.

[0028] An outer retaining ring is positioned on the outer wall of the fastening bolt, while an inner retaining ring corresponds to it and is positioned on the inner wall of the second through hole. A spring is sleeved around the fastening bolt, located between the outer and inner retaining rings. As the fastening bolt is inserted into the second through hole, the outer and inner retaining rings gradually approach each other. At this time, the spring is gradually compressed, pressing against both the inner and outer retaining rings, providing additional preload to the fastening bolt and ensuring the stability and reliability of the fastening effect. Simultaneously, during disassembly, the spring force assists in the smooth removal of the bolt, improving the convenience and efficiency of disassembly.

[0029] Furthermore, the sealing structure includes:

[0030] A sealing ring is installed between the fuel tank cover and the fuel tank body;

[0031] A limiting steel ring is placed between the fuel tank cover and the fuel tank body and contacts the sealing ring to limit the position of the sealing ring.

[0032] An isolation steel ring is placed between the fuel tank cover and the fuel tank body and is located on the outside of the sealing structure to limit the pressing distance between the fuel tank cover and the fuel tank body.

[0033] It also includes a flow guide structure installed on the fuel tank cover, the end of which is bent and extends downward.

[0034] The sealing ring is positioned between the tank cover and the tank body. It is made of high-performance elastic material, possessing excellent oil resistance, temperature resistance, and aging resistance, ensuring the stability and reliability of the seal. A limiting steel ring is positioned outside the sealing ring, making tight contact with it. This limiting steel ring not only restricts the position of the sealing ring, preventing displacement during installation and use, but also, more importantly, limits the compression distance between the tank cover and the tank body, preventing severe deformation of the sealing ring due to excessive compression.

[0035] Meanwhile, the end of the fuel tank cover is bent and extends downward to form a shielding barrier. The design of the flow guiding structure can not only guide rainwater and other liquids to flow smoothly down and prevent them from seeping into the interior of the sealing structure, but also effectively prevent direct sunlight and ultraviolet radiation from damaging the sealing ring, further extending the service life of the sealing ring.

[0036] The beneficial effects of this application are:

[0037] 1. By designing replaceable fastening components, the connection between the tank cover and the tank body remains stable and reliable after multiple disassembly and reinstallation, avoiding fastening failure due to thread wear and preventing damage to the tank cover and tank body, thus extending the overall service life of the transformer housing.

[0038] 2. The fastening mechanism utilizes the combination of an outer fastening ring, an inner fastening ring, and a spring sleeve. As the fastening bolt is inserted into the second through hole, the spring is gradually compressed and presses against the inner and outer fastening rings, providing additional preload to the fastening bolt and ensuring the stability and reliability of the fastening effect. Simultaneously, during disassembly, the spring force assists in the smooth removal of the bolt, improving the convenience and efficiency of disassembly.

[0039] 3. The sealing components, made of high-performance sealing materials, effectively prevent oil leakage and the entry of external impurities, ensuring a clean and safe internal environment for the transformer enclosure. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of this utility model;

[0041] Figure 2 This is a schematic diagram of the sealing structure of this utility model;

[0042] Figure 3 This is a schematic diagram of the internal structure of the sealing structure of this utility model.

[0043] The reference numerals in the diagram are as follows: 100, fuel tank cover; 200, fuel tank body; 300, fastening assembly; 310, mounting protrusion; 311, first through hole; 320, second through hole; 330, fastening bolt; 331, nut; 340, mounting cap; 341, third through hole; 350, isolation gap; 360, outer fastening ring; 370, inner fastening ring; 380, spring; 400, sealing assembly; 410, sealing ring; 420, limiting steel ring; 430, isolation steel ring.

[0044] 440. Flow guiding structure. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0046] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0047] The transformer enclosure sealing structure provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0048] Example 1:

[0049] like Figures 1 to 3 As shown in the figure, this application provides a transformer housing sealing structure, including:

[0050] Fuel tank cap 100;

[0051] Fuel tank body 200;

[0052] A sealing structure, the sealing structure comprising:

[0053] Fastening assembly 300 is used to connect the fuel tank cover 100 and the fuel tank body 200;

[0054] The sealing assembly 400 is used to seal the fuel tank cover 100 and the fuel tank body 200;

[0055] The fastening component 300 is a replaceable part, and its installation and removal will not cause damage to the fuel tank cover 100 or the fuel tank body 200.

[0056] In some embodiments of this application, such as Figure 1As shown, the above-described transformer enclosure sealing structure employs an oil tank cover 100, which serves as the top cover of the transformer enclosure 200, sealing it to prevent external impurities and moisture from entering. The oil tank enclosure 200 is the main housing part of the transformer, used to install the transformer body and related components, ensuring the transformer operates in a safe environment. A fastening assembly 300 connects the oil tank cover 100 and the oil tank enclosure 200, achieving a secure connection. The fastening assembly 300 is designed as a replaceable part; even after prolonged use or repeated disassembly, if the fastening effect decreases or wear occurs, a new fastening assembly 300 can be easily replaced without requiring a major overhaul or replacement of the entire sealing structure. A sealing assembly 400 is located between the oil tank cover 100 and the oil tank enclosure 200, filling the small gap between them to prevent oil leakage or the entry of external impurities. It is made of high-performance sealing material, possessing excellent oil resistance, temperature resistance, and aging resistance, ensuring the sealing performance of the transformer enclosure during long-term operation.

[0057] By designing a replaceable fastening component 300, the connection between the tank cover 100 and the tank body 200 remains secure and reliable after multiple disassemblies and reinstallations. This avoids fastening failure due to thread wear and prevents damage to the tank cover 100 and tank body 200, thus extending the overall service life of the transformer enclosure. The sealing component 400, made of high-performance sealing material, effectively prevents oil leakage and the ingress of external impurities, ensuring a clean and safe internal environment for the transformer enclosure.

[0058] Example 2:

[0059] This application provides a transformer housing sealing structure. In addition to the above-mentioned technical features, the transformer housing sealing structure of this application also includes the following technical features.

[0060] like Figure 2 and Figure 3 As shown, the fastening assembly 300 includes:

[0061] The mounting protrusion 310 is set on the fuel tank cover 100, and a first through hole 311 is provided inside it, which extends to the bottom of the fuel tank cover 100.

[0062] The second through hole 320 is provided on the oil tank body 200 and corresponds to the position of the first tank body;

[0063] Fastening bolt 330, and a nut 331 adapted to fastening bolt 330 is provided at the bottom of the oil tank body 200;

[0064] The threaded end of the fastening bolt 330 passes through the first through hole 311 and the second through hole 320 in sequence and then engages with the nut 331.

[0065] In this embodiment, the mounting protrusion 310 is positioned at a specific location on the fuel tank cover 100. It has a first through hole 311 extending from the top to the bottom of the fuel tank cover 100, providing a channel for the fastening bolt 330 to pass through. This not only enhances the mechanical strength of the fuel tank cover 100 but also extends the fastening distance, thereby improving the fastening effect. A second through hole 320 corresponds to the first through hole 311 and is located on the fuel tank body 200. When the fuel tank cover 100 and the fuel tank body 200 are accurately aligned, the first through hole 311 and the second through hole 320 will perfectly coincide. The threaded end of the fastening bolt 330 is designed to pass through the first through hole 311 and the second through hole 320 sequentially and engage with the nut 331 at the bottom of the fuel tank body 200. The fastening connection between the fuel tank cover 100 and the fuel tank body 200 is achieved by rotating the bolt.

[0066] The fastening component 300 not only ensures a secure connection between the fuel tank cover 100 and the fuel tank body 200, preventing loosening or leakage caused by vibration or external force, but its replaceability also greatly reduces maintenance costs and difficulty. Even if the fastening effect decreases or wear occurs after long-term use or multiple disassemblies, the fastening component 300 can be easily replaced without overhauling or replacing the entire sealing structure.

[0067] Example 3:

[0068] This application provides a transformer housing sealing structure. In addition to the above-mentioned technical features, the transformer housing sealing structure of this application also includes the following technical features.

[0069] like Figure 2 and Figure 3 As shown, the fastening assembly 300 also includes a mounting cap 340 disposed on the mounting protrusion 310, the surface of which has a third through hole 341 through which the fastening bolt 330 passes and communicates with the first through hole 311.

[0070] In this embodiment, the mounting cap 340 is disposed on the top of the mounting protrusion 310 and mates with it via a threaded connection. The mounting cap 340 has a third through hole 341 on its surface. This through hole not only communicates with the first through hole 311 inside the mounting protrusion 310 but also provides a smoother passage for the fastening bolt 330 to pass through. The mounting cap 340 also serves as an isolation and protection mechanism. During the installation and removal of the fastening bolt 330, the mounting cap 340 prevents the bolt head from directly contacting the surface of the fuel tank cover 100, thereby avoiding damage caused by friction or impact. This not only protects the surface integrity of the fuel tank cover 100 but also extends the service life of the fastening assembly 300.

[0071] In addition, the mounting cap 340 provides a more stable support point for the fastening bolt 330. During the bolt tightening process, the mounting cap 340 can ensure that the threaded end of the bolt can accurately and stably pass through the first through hole 311 and the second through hole 320, and closely cooperate with the nut 331 at the bottom, further enhancing the fastening effect and stability of the fastening assembly 300.

[0072] Furthermore, the diameter of the third through hole 341 is the same as the diameter of the fastening bolt 330, and the diameters of the first through hole 311 and the second through hole 320 are the same. The diameters of both are larger than the diameter of the fastening bolt 330, forming an isolation gap 350.

[0073] The diameter of the third through hole 341 is set to be the same as the diameter of the fastening bolt 330, which ensures that the fastening bolt 330 can pass smoothly through the third through hole 341, while also preventing the fastening bolt 330 from shifting during installation. The diameters of the first through hole 311 and the second through hole 320 are larger than the diameter of the fastening bolt 330, forming an isolation gap 350. This gap effectively prevents the threaded part of the bolt from directly contacting the inner wall of the through hole after the fastening bolt 330 is inserted, which not only reduces the possibility of thread wear, but also improves the durability and stability of the fastening assembly 300.

[0074] Example 4:

[0075] This application provides a transformer housing sealing structure. In addition to the above-mentioned technical features, the transformer housing sealing structure of this application also includes the following technical features.

[0076] like Figure 2 and Figure 3 As shown, an outer fastening ring 360 is provided on the outer wall of the fastening bolt 330, an inner fastening ring 370 is provided on the inner wall of the second through hole 320, and a spring 380 is provided between the outer fastening ring 360 and the inner fastening ring 370, with the spring 380 sleeved on the outside of the fastening bolt 330.

[0077] In this embodiment, the outer fastening ring 360 is disposed on the outer wall of the fastening bolt 330, and the inner fastening ring 370 corresponds to the outer fastening ring 360 and is disposed on the inner wall of the second through hole 320. The spring 380 is sleeved around the fastening bolt 330, located between the outer fastening ring 360 and the inner fastening ring 370. As the fastening bolt 330 passes through the second through hole 320, the outer fastening ring 360 and the inner fastening ring 370 gradually approach each other. At this time, the spring 380 is gradually compressed and presses against the inner fastening ring 370 and the outer fastening ring 360, providing additional preload to the fastening bolt 330 and ensuring the stability and reliability of the fastening effect. Simultaneously, during disassembly, the elasticity of the spring 380 also assists in the smooth removal of the bolt, improving the convenience and efficiency of disassembly.

[0078] Example 5:

[0079] This application provides a transformer housing sealing structure. In addition to the above-mentioned technical features, the transformer housing sealing structure of this application also includes the following technical features.

[0080] like Figure 2 and Figure 3 As shown, the sealing structure includes:

[0081] A sealing ring 410 is disposed between the fuel tank cover 100 and the fuel tank body 200;

[0082] A limiting steel ring 420 is disposed between the fuel tank cover 100 and the fuel tank body 200 and contacts the sealing ring 410 to limit the position of the sealing ring 410.

[0083] An isolation steel ring 430 is disposed between the fuel tank cover 100 and the fuel tank body 200 and located on the outside of the sealing structure to limit the pressing distance between the fuel tank cover 100 and the fuel tank body 200.

[0084] It also includes a flow guide structure installed on the fuel tank cover 100, the end of which is bent and extends downward.

[0085] In this embodiment, the sealing ring 410 is disposed between the fuel tank cover 100 and the fuel tank body 200. It is made of a high-performance elastic material with excellent oil resistance, temperature resistance, and aging resistance, ensuring the stability and reliability of the sealing effect. The limiting steel ring 420 is disposed outside the sealing ring 410 and is in close contact with it. The limiting steel ring 420 not only restricts the position of the sealing ring 410, preventing displacement during installation and use, but also provides a barrier steel ring 430. This barrier steel ring is disposed between the fuel tank cover 100 and the fuel tank body 200, located outside the sealing structure, limiting the compression distance between them and preventing severe deformation of the sealing ring 410 due to excessive compression.

[0086] Meanwhile, the end of the fuel tank cover 100 is bent and extends downward to form a shielding barrier. The design of the flow guiding structure can not only guide rainwater and other liquids to flow smoothly down and prevent them from seeping into the interior of the sealing structure, but also effectively prevent direct sunlight and ultraviolet radiation from damaging the sealing ring 410, further extending the service life of the sealing ring 410.

[0087] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0088] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A transformer enclosure sealing structure, characterized in that: include: Fuel tank cap (100); Fuel tank body (200); A sealing structure, the sealing structure comprising: Fastening assembly (300) for connecting the fuel tank cover (100) and the fuel tank body (200); A sealing assembly (400) is used to seal the fuel tank cover (100) and the fuel tank body (200); The fastening component (300) is replaceable and will not cause damage to the fuel tank cover (100) or the fuel tank body (200) during installation and removal.

2. The transformer tank sealing structure according to claim 1, characterized in that: The fastening assembly (300) includes: An installation protrusion (310) is provided on the fuel tank cover (100), and a first through hole (311) is provided inside it, which extends to the bottom of the fuel tank cover (100); The second through hole (320) is provided on the tank body (200) and corresponds to the position of the first tank body; Fastening bolt (330), and a nut (331) adapted to the fastening bolt (330) is provided at the bottom of the oil tank body (200); The threaded end of the fastening bolt (330) passes through the first through hole (311) and the second through hole (320) in sequence and then engages with the nut (331).

3. The transformer tank sealing structure according to claim 2, characterized in that: The fastening assembly (300) also includes a mounting cap (340) disposed on the mounting protrusion (310), the surface of which has a third through hole (341) through which a fastening bolt (330) passes and communicates with the first through hole (311).

4. The transformer tank sealing structure according to claim 3, characterized in that: The diameter of the third through hole (341) is the same as the diameter of the fastening bolt (330). The diameters of the first through hole (311) and the second through hole (320) are the same, and their diameters are larger than the diameter of the fastening bolt (330), forming an isolation gap (350).

5. A transformer tank sealing structure according to claim 4, characterized in that: The outer wall of the fastening bolt (330) is provided with an outer fastening ring (360), and the inner wall of the second through hole (320) is provided with an inner fastening ring (370). A spring (380) is provided between the outer fastening ring (360) and the inner fastening ring (370), and the spring (380) is sleeved on the outside of the fastening bolt (330).

6. The transformer tank sealing structure according to claim 5, characterized in that: The sealing structure includes: A sealing ring (410) is provided between the fuel tank cover (100) and the fuel tank body (200); A limiting steel ring (420) is provided between the fuel tank cover (100) and the fuel tank body (200) and contacts the sealing ring (410) to limit the position of the sealing ring (410); An isolation steel ring (430) is disposed between the fuel tank cover (100) and the fuel tank body (200) and located on the outside of the sealing structure to limit the pressing distance between the fuel tank cover (100) and the fuel tank body (200); It also includes a flow guide structure installed on the fuel tank cover (100), the end of which is bent and extends downward.

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