Fastener protection device and fastening structure

Abstract

The utility model relates to the field of bolt protection, and provides a fastener protection device and a fastening structure which are applied to a nut structure exposed outside, a nut is used for being tightly attached to an installation plane, the fastener protection device comprises a cover body, and the cover body is connected with the installation plane in a sealed mode. And the cover body covers the outer side of the nut to form sealing. According to the scheme, the cover is arranged on the outer side of the nut to isolate the inside and the outside, and therefore physical corrosion prevention is achieved. The cover body forms a sealed or semi-sealed space on the outer side of the nut, so that external corrosive media such as air, moisture and chloride ions are isolated, and the corrosion of the corrosive media to the contact part of the nut and the bolt is reduced. Especially in a high-salinity and high-humidity environment, the physical barrier can effectively slow down the occurrence speed of electrochemical corrosion and atmospheric corrosion, and the service life of the fastener is remarkably prolonged.

Description

Technical Field

[0001] The utility model relates to the field of bolt protection, in particular to a fastener protection device and a fastening structure. Background Art

[0002] Fasteners are commonly used as the main connection method for foundations, towers, wind turbine systems and other parts of offshore wind farms and marine facilities. The reliability of fasteners is crucial to the safety of the entire platform and equipment.

[0003] In the existing technology, surface coating is usually used for corrosion protection. However, when installing bolts and nuts, metal tools may damage the coating, causing the corrosion protection to fail. Changes in external temperature and humidity may also cause the coating to peel and fall off. In this way, the exposed metal parts will corrode rapidly, producing reddish-brown and yellow rust spots, and even causing the metal to become loose and the oxide scale to fall off. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a fastener protection device and a fastening structure to prevent the fasteners from corroding too quickly.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a fastener protection device, which is applied to a nut structure exposed to the outside world, wherein the nut is used to be fastened and adhered to a mounting surface, and the fastener protection device includes:

[0006] The cover is sealed with the mounting plane and is arranged on the outside of the nut to form a seal.

[0007] In a specific embodiment of the present invention, a blind hole is provided on the inner side of one end of the cover away from the mounting plane, an internal thread is provided in the blind hole, and the internal thread forms a threaded fit with the end of the bolt protruding from the nut.

[0008] In a specific embodiment of the present invention, a boss is provided at one end of the cover away from the mounting plane, and the blind hole is provided inside the boss.

[0009] In a specific embodiment of the present invention, the depth of the blind hole is greater than the length of the bolt protruding from the nut.

[0010] In a specific embodiment of the present invention, the boss is a regular hexagonal column structure.

[0011] In a specific embodiment of the present invention, the cover is made of corrosion-resistant material.

[0012] In a specific embodiment of the present invention, the cover body is a cylindrical structure, and the inner diameter of the cover body is larger than the maximum outer diameter of the nut.

[0013] In a specific embodiment of the present invention, a sealing ring is provided on an end surface of the cover body close to the installation plane.

[0014] The utility model also proposes a fastening structure, comprising:

[0015] bolt;

[0016] a nut, threadedly connected to the bolt, wherein the end of the screw rod of the bolt protrudes from the nut;

[0017] A fastener guard, such as the fastener guard described above, is mounted on the outside of the nut.

[0018] In a specific embodiment of the present invention, the thread on the screw rod of the bolt is a bidirectional anti-loosening thread, and the internal thread of the blind hole is in the opposite direction to the thread on the nut.

[0019] This utility model provides a fastener protection device and fastening structure. In this solution, a cover is provided on the outside of the nut to isolate the inside and outside world, thereby achieving physical corrosion protection. The cover forms a sealed or semi-sealed space outside the nut, isolating corrosive media such as air, moisture, and chloride ions from the outside, reducing their erosion of the contact area between the nut and bolt. Especially in high-salinity and high-humidity environments, this physical barrier can effectively slow the occurrence of electrochemical and atmospheric corrosion, significantly extending the service life of the fastener. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a structural diagram of a fastener protection device in a specific embodiment of the present utility model;

[0022] Figure 2 This is a schematic diagram of the installation of a fastener protection device in a specific embodiment of the present invention.

[0023] Explanation of the reference numerals: 1. nut; 2. bolt; 3. mounting plane; 10. cover; 11. blind hole; 12. boss; 20. sealing ring. DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features within these embodiments may be combined with one another, unless they conflict.

[0025] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed at will, and the component layout may also be more complex.

[0026] With the global adjustment of energy structures and the deepening development of low-carbon and environmentally friendly concepts, offshore wind power has gradually become a key component of the new energy sector, playing a significant role in reducing carbon emissions and alleviating the energy crisis. However, the operating environment of offshore wind power and other marine facilities is extremely complex. Long-term exposure to high temperature, high humidity, and high salinity in the marine atmosphere poses severe corrosion challenges to fasteners, key mechanical connection components. As the most commonly used connection method in mechanical structures, the performance of fasteners directly affects the reliability, safety, and service life of the equipment. In the marine environment, corrosion has become a key factor affecting the normal service life of fasteners, seriously threatening the overall safety of the facilities.

[0027] Offshore wind farms and marine facilities commonly use fasteners as the primary connection method for foundations, towers, and wind turbine systems. The reliability of these fasteners is crucial to the safety of the entire platform and equipment. However, while designers and operators have made significant research advances in fastener fatigue life, fracture failure, stress-strain states, and impact loads, they often overlook the impact of corrosion failure on fastener performance.

[0028] In recent years, as wind turbine operation times have gradually increased, corrosion failure has become an increasingly prominent issue. Operational data from some coastal wind farms indicates that fastener corrosion not only significantly reduces the strength and stability of connected components but can also cause secondary damage to the underlying structure, such as concrete cracking and water seepage. These issues directly threaten the safe operation of wind turbines and significantly shorten the overall service life of the equipment. Therefore, addressing fastener corrosion has become a critical technical step in ensuring the long-term safe operation of offshore wind power and marine facilities.

[0029] In marine environments, fasteners face a combination of multiple corrosion effects. In highly saline marine environments, chloride ions (Cl-) in the air have a strong corrosive effect on metal surfaces, inducing pitting, crevice corrosion, and stress corrosion cracking through electrochemical reactions. The high humidity, intense sunlight, and alternating wet-dry cycles of the marine environment accelerate the oxidation process of metals, forming large amounts of oxides and corrosion products. Bolt pairs are subjected to long-term vibration, wind loads, and mechanical friction. These mechanical effects, combined with corrosion reactions, accelerate metal degradation and failure. The narrow spaces between components such as nuts, washers, and screws easily accumulate moisture, salt, and impurities, creating favorable conditions for crevice corrosion and leading to more severe localized corrosion.

[0030] Through sampling and analysis of bolts of wind turbines that had been in operation for 6 years at a coastal wind farm, it was found that the corrosion of bolts, nuts and washers showed the following characteristics:

[0031] Failure of the nut surface coating: The protective coating peels and falls off over a large area, and the exposed metal parts corrode rapidly, producing reddish-brown and yellow rust spots, and even causing the metal to become loose and the oxide scale to fall off.

[0032] The gaskets are severely corroded: the corrosion level at the edges of the gaskets is significantly higher than that in the middle, and some gaskets have already fallen off at the edges.

[0033] The bolt shank has slight corrosion: In comparison, the bolt shank is better protected by the coating, but there is still slight corrosion problem on the thread near the nut.

[0034] These corrosion characteristics indicate that existing coating protection technologies are difficult to meet the long-term service requirements of fasteners in marine environments, and there is an urgent need to develop more efficient anti-corrosion solutions.

[0035] like Figure 1 、 2 As shown, the present invention proposes a fastener protection device. In this application, the fastener protection device is mainly applied to the nut 1 structure exposed to the outside, and can also be applied to the head of the bolt 2. For fasteners, the nut 1 is usually an exposed structure, the screw rod of the bolt 2 can be hidden by the mounting hole, and the head of the bolt 2 can be hidden in the form of a countersunk bolt 2. Therefore, the fastener protection device in the application is mainly applied to the nut 1.

[0036] The nut 1 is fastened to the mounting surface 3. The fastener protection device includes a cover 10, which is sealed with the mounting surface 3 and positioned to seal the outside of the nut 1. The cover 10 of the fastener protection device is sealed with the mounting surface 3, forming an enclosed protective space, thereby effectively isolating the nut 1 from direct contact with corrosive media such as air, moisture, dust, and chloride ions. This isolation and protection method is particularly suitable for harsh environments such as oceans, high humidity, and dusty conditions. It can effectively prevent the ingress of corrosive substances and slow the rate of electrochemical and environmental corrosion.

[0037] like Figure 1 、 2 As shown, a blind hole 11 is provided on the inner side of the end of the cover 10 facing away from the mounting plane 3. This blind hole 11 contains an internal thread that forms a threaded fit with the end of the bolt 2 protruding from the nut 1. The exposed threads of the bolt 2 are used to secure the cover 10 to the anchor nut 1. The internal threads in the blind hole 11 mesh with the external threads on the end of the bolt 2, ensuring a secure threaded fit. This design not only secures the cover 10 securely to the nut 1 and bolt 2 but also provides a certain degree of anti-loosening protection. Conventional protective covers often rely on external clips or adhesives, but this threaded fit makes the cover 10 more stable, preventing it from falling off even in environments with strong vibration or shock. By directly securing the cover 10 and the anchor nut 1 to the exposed threads of the bolt 2, a single structure is formed, ensuring a tighter connection between the cover 10, nut 1, and bolt 2. This approach effectively prevents loosening and displacement of the cover 10, enhancing its stability and maintaining good structural strength under various loads, thereby reducing the risk of accidental damage.

[0038] like Figure 1 、 2 As shown, the cover 10 is provided with a boss 12 at one end away from the mounting plane 3, and the blind hole 11 is disposed within the boss 12. The boss 12 and the blind hole 11 provided on the cover 10 provide a clear reference for installation and positioning, making the installation process more convenient and accurate. The boss 12 serves as a positioning guide, improving the accuracy of the fixation of the cover 10 on the mounting plane 3 and thus enhancing the stability of the overall structure. This structure can reduce offset errors and ensure the precise positioning of the cover 10, especially during the installation of machinery or equipment.

[0039] like Figure 1 、 2As shown, the depth of the blind hole 11 is greater than the length of the bolt 2 protruding from the nut 1. This design allows the bolt 2 to be fully embedded in the blind hole 11 during installation, preventing it from protruding or contacting external objects, and avoiding friction or interference caused by an inappropriate bolt 2 length. This design not only enhances the overall aesthetics of the installation but also reduces the impact of external pressure on the bolt 2 and cover 10, enhancing assembly stability. Furthermore, the sufficient depth of the blind hole 11 better accommodates the bolt 2 and increases the contact area of ​​the threads, thereby improving the security of the connection.

[0040] In one embodiment of the present invention, the boss 12 is a regular hexagonal column structure. This structure facilitates rotational installation with a wrench. The regular hexagonal boss 12 has six evenly spaced faces, allowing for easy installation using a standard hexagonal wrench (such as a common hexagonal screwdriver or hexagonal socket wrench). Because the six faces provide uniform contact points, the tool can more securely engage the boss 12, enabling more efficient rotational installation.

[0041] In a specific embodiment of the present invention, the cover body 10 is made of corrosion-resistant material. The corrosion-resistant material can be stainless steel, aluminum alloy, copper alloy, nickel-based alloy, engineering plastic, ceramic material, etc. The use of corrosion-resistant material can significantly improve the durability of the cover body 10 in harsh environments, especially for applications in corrosive environments such as high humidity, chemicals, salt spray, etc. This material can effectively extend the service life of the cover body 10. An appropriate amount of anti-corrosion grease can also be applied to the inside of the cover body 10 to expel air, which can further improve the anti-corrosion effect. Applying anti-corrosion grease further enhances the anti-corrosion protection. Anti-corrosion grease can effectively fill tiny cracks or pores on the surface and prevent the penetration of moisture or chemicals. The application of anti-corrosion grease can also reduce the corrosion rate inside and outside the cover body 10, especially on the contact surface or sealing part, further improving the anti-corrosion effect.

[0042] In a specific embodiment of the present invention, the cover body 10 is a cylindrical structure, and the inner diameter of the cover body 10 is larger than the maximum outer diameter of the nut 1. The cylindrical structure usually has good strength and stability, can evenly distribute external pressure, and prevent deformation caused by pressure concentration. The design of the inner diameter of the cover body 10 being larger than the maximum outer diameter of the nut 1 can ensure that there is sufficient space inside the cover body 10, and the rotation or position adjustment of the nut 1 will not be affected by the narrow space. This design can also avoid friction or interference between the nut 1 and the inner wall of the cover body 10, reduce wear and ensure the smooth progress of the installation process. For equipment that requires frequent maintenance or replacement of parts, providing sufficient space can simplify operation.

[0043] like Figure 1 、 2As shown, a sealing ring 20 is provided on one end surface of the housing 10 adjacent to the mounting plane 3. The provision of the sealing ring 20 effectively improves the sealing performance between the housing 10 and the mounting plane 3, preventing external factors such as air, moisture, and dust from entering the interior of the housing 10. This sealing design is crucial for preventing contamination, extending the lifespan of the device, and maintaining device performance. The sealing ring 20 can withstand temperature changes, pressure fluctuations, or liquid leakage, thereby protecting the housing 10 and its internal components from external influences and ensuring long-term stable operation. The sealing ring 20 may be an O-ring.

[0044] like Figure 2 As shown, the present invention also proposes a fastening structure, including a bolt 2, a nut 1 and the fastener protection device.

[0045] The nut 1 is threadedly connected to the bolt 2, and the end of the screw of the bolt 2 protrudes from the nut 1;

[0046] A fastener protection device, such as the fastener protection device described above, is installed on the outside of the nut 1.

[0047] The installation steps of the fastening structure are:

[0048] Step 1: After tightening the fan anchor bolts 2 according to the required torque, select a suitable cover 10.

[0049] Anchor bolts 2 connect the wind turbine to the foundation, securing the turbine securely to the ground or platform. Tightening bolts 2 to the required torque is crucial for ensuring a secure connection. This tightening ensures bolts 2 are securely in place using a specific torque value, avoiding overtightening or undertightening. This helps ensure the stability of the bolt connection and prevents loosening that could cause vibration or malfunction.

[0050] The cover 10, a crucial component of the fan, protects internal mechanical components from environmental influences such as dust, moisture, and foreign matter. Choosing the right cover 10 ensures a tight fit with the fan base and other components, ensuring a good seal. The size and design of the cover 10 must be tailored to the fan's actual operating environment and requirements.

[0051] Step 2: Before installing the cover 10 , clean the fan base and check to make sure that there are no defects on the fan base surface to prevent the sealing ring 20 of the cover 10 from being damaged when installing the cover 10 .

[0052] The cleaning of the base is to ensure that the fan cover 10 can be firmly installed on the base. If there is oil, dust or other impurities on the surface of the base, it may affect the installation accuracy and sealing effect of the cover 10, and thus affect the normal operation of the fan.

[0053] The surface of the base must be free of cracks, dents, rust or other defects, otherwise it will affect the contact and sealing between the cover body 10 and the base, causing air leakage or damage during the operation of the equipment, and may even cause equipment failure.

[0054] The housing 10 is typically equipped with a sealing ring 20 (e.g., a rubber sealing ring 20). This ring ensures a tight seal between the housing 10 and the base, preventing air or liquid leakage. During installation, if the base is unclean or uneven, the sealing ring 20 may be damaged or improperly installed, compromising the device's sealing effectiveness. Cleaning and inspection in this step can effectively prevent these issues.

[0055] Step 3: Install the cover 10 on the anchor nut 1 and tighten it properly. The anti-loosening thread of the cover 10 is tightly combined with the thread of the bolt 2 to prevent the thread from loosening.

[0056] Installation of the cover 10 and anchor nuts 1: Installing the cover 10 onto the anchor nuts 1 and tightening them is a key step in ensuring a secure connection between the cover 10 and the foundation structure. The anchor nuts 1 are an important foundation for installing the cover 10, and their stability directly affects the stability of the cover 10 and the safety of the fan.

[0057] Step 4: When repairing or inspecting the equipment, the cover 10 can be removed.

[0058] During later use of the equipment, the cover 10 may need to be disassembled for maintenance or inspection. This step is designed to simplify the maintenance process and improve the maintenance efficiency of the equipment. Since the cover 10 is usually a key component that protects the internal components of the fan, its disassembly process must avoid damaging the seal or affecting the stability of other components. The cover 10 is designed to be directly removable, allowing maintenance personnel to quickly and easily access the interior of the fan to perform necessary inspection, cleaning, or maintenance work.

[0059] Reasonable installation and anti-loosening design make it easy to disassemble the cover body 10 without spending too much time and effort. The anti-loosening thread design also ensures the convenience of the disassembly process, so that the disassembly work will not be hindered by loose threads, thereby improving work efficiency.

[0060] In a specific embodiment of the present invention, the thread on the screw rod of the bolt 2 is a two-way anti-loosening thread. The two-way anti-loosening thread (or called "reverse bevel anti-loosening thread") is a specially designed thread structure, which is characterized by self-locking and anti-loosening effects in both directions of the thread. The design of the two-way anti-loosening thread will form a strong self-locking effect when tightened, and a higher torque is required to disassemble. This feature makes the bolt 2 not easy to loosen even under frequent impact or torsional forces, ensuring the firmness and stability of the connection. The internal thread of the blind hole 11 is opposite to the thread on the nut 1. The design of opposite thread directions can make the bolt 2 generate a self-balancing reverse torque when subjected to external force, thereby offsetting the rotation tendency caused by the external force to a certain extent. This reverse torque can effectively suppress the loosening of the bolt 2 caused by load changes.

[0061] In summary, the present invention proposes a fastener protection device and fastening structure. In the above scheme, a cover 10 is provided outside the nut 1 to isolate the interior from the exterior, thereby achieving physical corrosion protection. Cover 10 forms a sealed or semi-sealed space outside the nut 1, isolating corrosive media such as air, moisture, and chloride ions from the outside, reducing their erosion of the contact area between the nut 1 and the bolt 2. Especially in high-salinity and high-humidity environments, the physical barrier can effectively slow the occurrence of electrochemical and atmospheric corrosion, significantly extending the service life of the fastener.

[0062] Traditional fastener anti-corrosion designs typically rely on coatings to prevent corrosion on the surface of the nut 1. However, over time, coatings can peel and flake off under environmental influences such as sunlight, salt spray, and sandstorms, leading to a decrease in corrosion resistance. The cover 10 effectively protects the coating, reducing its direct exposure to harsh environments. This extends the coating's lifespan and enhances overall protection.

[0063] There are usually gaps in fastener connection structures, especially the gaps between the nut 1, bolt 2 and washer, which are prone to accumulate moisture and salt, leading to crevice corrosion. The design of the cover 10 can reduce the exposure of the gap and prevent the accumulation of moisture and impurities, thereby effectively reducing local corrosion and avoiding local strength degradation caused by crevice corrosion. The cover 10 not only has a protective effect, but also can enhance the impact resistance of the mechanical structure to a certain extent. In high wind load environments such as offshore wind farms, the nut 1 and bolt 2 will be subjected to large mechanical stress, and the support of the cover 10 can share some of the external force and avoid excessive deformation or damage to the nut 1 and bolt 2. The design of the cover 10 can simplify the maintenance process of the nut 1. In conventional anti-corrosion maintenance, the inspection and repair of the surface coating of the nut 1 are relatively frequent, especially in offshore environments, where the maintenance cost is relatively high. The cover 10 can reduce the rate of coating loss to a certain extent, extend the maintenance cycle, reduce the maintenance frequency, and thus reduce operating costs.

[0064] The cover 10 is a structural design for the exterior of the nut 1. It generally does not change the original specifications and strength of the nut 1, and does not require any processing or modification of the nut 1 itself. Therefore, it can be directly used with existing nut 1 designs. This method is highly adaptable and can be applied to nuts 1 of various specifications and materials.

[0065] The design of the cover 10 is a physical protection measure that does not affect the selection and application of the surface coating of the nut 1. It can be combined with other anti-corrosion technologies (such as cathodic protection, corrosion-resistant coatings, corrosion-resistant alloy materials, etc.) to improve the protection effect. For example, the combination of the cover 10 and cathodic protection can further slow metal corrosion, and the dry environment inside the cover 10 also helps reduce electrochemical corrosion.

[0066] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by persons of ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention. Efficiently realize the connection between the high voltage of the motor and the high voltage of the controller, small size, oil-resistant sealing design, reliable sealing of the controller cavity and the motor cavity, fastener protection device and fastening structure oil cooling design, effectively reduce the temperature, achieve greater flow and increase product life.

[0067] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

[0068] Reference throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein are possible in light of the teachings herein and are considered part of the spirit and scope of the invention.

[0069] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0070] In addition, unless otherwise expressly indicated, any marking arrows in the drawings should be regarded as illustrative only and not limiting. Furthermore, unless otherwise indicated, the term "or" as used herein is generally intended to mean "and / or." Where a term is unclear in providing separation or combination capabilities, the combination of components or steps will also be considered as indicated.

[0071] As used in the description herein and throughout the claims that follow, “a,” “an,” and “the” include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of “in” includes “in” and “on” unless otherwise indicated.

[0072] The above description of the illustrated embodiments of the present invention (including that described in the Abstract) is not intended to be exhaustive or to limit the present invention to the precise forms disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention, as those skilled in the art will recognize and understand. As noted, these modifications may be made to the present invention in light of the above description of the illustrated embodiments of the present invention, and these modifications will be within the spirit and scope of the present invention.

[0073] The systems and methods have been generally described herein in detail to facilitate understanding of the present invention. In addition, various specific details have been given to provide an overall understanding of the embodiments of the present invention. However, those skilled in the relevant art will recognize that the embodiments of the present invention can be practiced without one or more of the specific details, or can be practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusing various aspects of the embodiments of the present invention.

[0074] Thus, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are within the foregoing disclosure, and it should be understood that in some cases, some features of the present invention will be employed without the corresponding use of other features without departing from the scope and spirit of the proposed invention. Thus, many modifications may be made to adapt particular circumstances or materials to the true scope and spirit of the present invention. The present invention is not intended to be limited to the specific terminology used in the claims below and / or to the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined solely by the appended claims.

Claims

1. A fastener protection device, characterized in that: Applicable to a nut structure exposed to the outside world, the nut is used to fasten and fit on the mounting surface, and the fastener protection device includes: The cover is sealed with the mounting plane and is arranged on the outside of the nut to form a seal.

2. The fastener protection device according to claim 1, characterized in that: A blind hole is provided on the inner side of one end of the cover away from the mounting plane. An internal thread is provided in the blind hole. The internal thread is threadedly matched with the end of the bolt protruding from the nut.

3. The fastener protection device according to claim 2, characterized in that: A boss is provided at one end of the cover away from the mounting plane, and the blind hole is provided inside the boss.

4. The fastener protection device according to claim 2, characterized in that: The depth of the blind hole is greater than the length of the bolt protruding from the nut.

5. The fastener protection device according to claim 3, characterized in that: The boss is a regular hexagonal column structure.

6. The fastener protection device according to claim 1, characterized in that The cover body is made of corrosion-resistant material.

7. The fastener protection device according to claim 1, characterized in that: The cover body is a cylindrical structure, and the inner diameter of the cover body is larger than the maximum outer diameter of the nut.

8. The fastener protection device according to claim 1, characterized in that A sealing ring is provided on an end surface of the cover body close to the installation plane.

9. A fastening structure, characterized in that: include: bolt; a nut, threadedly connected to the bolt, wherein the end of the screw rod of the bolt protrudes from the nut; A fastener protection device, a fastener protection device as described in any one of claims 2 to 5, wherein the fastener protection device is installed on the outside of the nut.

10. The fastening structure according to claim 9, characterized in that: The thread on the screw rod of the bolt is a bidirectional anti-loosening thread, and the internal thread of the blind hole is in the opposite direction to the thread on the nut.

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