Anti-corrosion sleeve for photovoltaic frame bolt

Abstract

The scheme discloses an anti-corrosion sleeve for a photovoltaic frame bolt in the technical field of photovoltaic accessories, the anti-corrosion sleeve comprises a fixed cylinder with an opening at one end, the inner wall of the opening end of the fixed cylinder is provided with an internal thread matched with a screw of the photovoltaic frame bolt for use, and the outer wall of the fixed cylinder is sequentially coated with a heat insulation layer and an anti-aging layer from inside to outside. The anti-corrosion sleeve can effectively prevent or delay corrosion of the exposed part of the screw of the bolt.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaic accessories technology, and specifically relates to an anti-corrosion sleeve for photovoltaic frame bolts. Background Technology

[0002] As the core supporting structure of a photovoltaic power generation system, the reliability of the photovoltaic support structure directly affects the long-term operational efficiency and safety of the power station. Bolts, as key connecting components in the assembly of the support structure, are constantly exposed to the complex outdoor environment, including rainwater erosion, ultraviolet radiation, temperature fluctuations, and chemical corrosion from industrial pollutants (such as SO2 and NOx). To ensure a stable connection between the various components of the photovoltaic support structure, some bolts are often exposed after installation. These exposed bolts are in direct contact with the external environment, becoming a major area for corrosion and damage.

[0003] Currently, the main measures to address the corrosion problem of photovoltaic bracket bolts are as follows: 1. Hot-dip galvanizing is used to form a zinc coating on the bolt surface. Zinc's electrochemical activity preferentially corrodes it over iron, thus protecting the bolt substrate. However, for exposed bolt sections, due to long-term exposure, the hot-dip galvanized layer is more susceptible to wear from mechanical vibration and friction, causing the bolt to lose its protection and accelerating corrosion. 2. Applying anti-corrosion paint provides protection, but ordinary anti-corrosion paint has limited adhesion and weather resistance. Under long-term exposure to wind, sun, and rain, the paint film on exposed bolts is prone to peeling and powdering, making it difficult to provide sustained and effective protection.

[0004] Therefore, designing a method that can effectively prevent or delay corrosion of the exposed parts of bolts and screws is of positive significance for extending the service life of photovoltaic bracket bolts and ensuring the normal use of photovoltaic brackets. Utility Model Content

[0005] The present invention aims to provide an anti-corrosion sleeve for photovoltaic frame bolts to prevent or delay corrosion of the exposed part of the bolt thread.

[0006] The anti-corrosion sleeve for photovoltaic frame bolts in this solution includes a fixing cylinder with one end open. The inner wall of the opening end of the fixing cylinder is provided with an internal thread that mates with the bolt of the photovoltaic frame bolt. The outer wall of the fixing cylinder is covered with a heat insulation layer and an anti-aging layer from the inside out.

[0007] The working principle and beneficial effects of this solution:

[0008] When protection is needed for the exposed bolts of a photovoltaic frame, an anti-corrosion sleeve is screwed onto the exposed portion of the bolt using a threaded connection. The sleeve isolates the exposed bolt from the external environment, preventing direct contact with rainwater, industrial pollutants, and other contaminants, thus preventing chemical corrosion. The insulation layer effectively blocks heat transfer from the external environment to the bolt, reducing thermal stress damage caused by temperature fluctuations. The anti-aging layer resists ultraviolet radiation and industrial pollutants, protecting the structural integrity of the sleeve and providing continuous and stable protection for the bolt.

[0009] Furthermore, the open end of the fixed cylinder is provided with an annular groove, and a first sealing ring is provided in the groove. The first sealing ring can fill the gap between the fixed cylinder and the screw, forming a sealing barrier to further prevent rainwater, dust, industrial pollutants, etc. from entering the interior of the fixed cylinder.

[0010] Furthermore, the open end of the fixing cylinder is integrally formed with a protective cylinder for accommodating the nuts of the photovoltaic frame bolts. The fixing cylinder and the protective cylinder are coaxial, and the open end of the fixing cylinder extends towards and passes through the protective cylinder. The protective cylinder can provide all-round protection for the nuts of the photovoltaic frame bolts, preventing the nuts from being directly exposed to the complex outdoor environment. This protects the nuts from the effects of rainwater erosion, ultraviolet radiation, temperature fluctuations, and chemical corrosion from industrial pollutants, ensuring the fastening performance of the nuts and preventing loosening caused by nut corrosion. This improves the overall stability and reliability of the photovoltaic support connection.

[0011] Furthermore, the open end of the protective cylinder is provided with an annular groove, and a first sealing ring is provided in the groove. The first sealing ring at the open end of the protective cylinder can effectively seal the gap between the protective cylinder and the nut or other components, preventing harmful substances in the external environment from entering the interior of the protective cylinder, further strengthening the protection of the nut, and ensuring that the nut is not corroded during long-term use.

[0012] Furthermore, the heat insulation layer and the anti-aging layer extend to the end of the protective cylinder's opening, ensuring that the protective cylinder is also protected by the heat insulation layer and the anti-aging layer.

[0013] Furthermore, an adjusting cylinder with a through-axis direction is threaded onto the outer wall of the open end of the protective cylinder. The groove and the first sealing ring are located at the end of the adjusting cylinder away from the fixed cylinder. The adjusting cylinder, through its threaded connection, allows for adjustment of its position and tightness according to actual installation requirements, enabling the anti-corrosion sleeve to adapt to photovoltaic frame bolts of different specifications and installation conditions. Simultaneously, the cooperation between the adjusting cylinder and the protective cylinder, along with the first sealing ring at the cooperating end, further enhances the sealing and protective performance of the open end of the protective cylinder, effectively preventing external environmental factors from damaging the nuts and bolts.

[0014] Furthermore, the first sealing ring is integrally formed with a sealing gasket, which covers the open end of the protective cylinder. The sealing gasket has a through hole that is interference-fitted with the screw of the photovoltaic frame bolt. The sealing gasket, covering the open end of the protective cylinder, works in conjunction with the first sealing ring to form a double sealing structure, greatly improving the sealing effect of the open end of the protective cylinder. The interference-fitted through hole can tightly wrap the screw, preventing external substances from entering along the gap between the screw and the sealing gasket, while also providing a certain degree of fixation and buffering for the screw.

[0015] Furthermore, the inner wall of the regulating cylinder is provided with an annular limiting groove, and a second sealing ring is provided in the limiting groove, with the end of the limiting groove closer to the regulating cylinder and farther from the first sealing ring. The second sealing ring can form an additional seal between the regulating cylinder and the protective cylinder, preventing moisture, dust and other impurities from entering the interior of the anti-corrosion sleeve from the regulating cylinder.

[0016] Furthermore, the fixing cylinder, protective cylinder, and adjusting cylinder are all made of plastic. Plastic is lightweight, low-cost, and easy to process, facilitating the production, manufacturing, and installation of the anti-corrosion sleeve. Simultaneously, plastic has good corrosion resistance, capable of resisting the erosion of rainwater and industrial pollutants in the external environment to a certain extent, protecting the internal screws and nuts, and is not prone to rust, thus extending the service life of the anti-corrosion sleeve and reducing maintenance costs.

[0017] Furthermore, the insulation layer is made of closed-cell foamed fluororubber. Closed-cell foamed fluororubber possesses excellent thermal insulation properties; its internal closed-cell structure effectively prevents heat conduction, greatly reducing the transfer of heat from the external environment to the screw, and significantly reducing thermal stress damage to the screw caused by temperature fluctuations. In addition, closed-cell foamed fluororubber also exhibits good weather resistance, corrosion resistance, and flexibility, enabling it to adapt to complex and changing outdoor environments and stably perform its thermal insulation and protective functions over a long period.

[0018] Furthermore, the anti-aging layer is made of titanium dioxide. Titanium dioxide has a strong ultraviolet shielding ability, effectively absorbing and reflecting ultraviolet rays to prevent radiation damage to components such as the fixing cylinder and protective cylinder, thus slowing down their aging rate. At the same time, titanium dioxide is chemically stable, resisting the corrosion of industrial pollutants and other chemicals, protecting the structural integrity of the anti-corrosion sleeve, ensuring that the anti-corrosion sleeve maintains good protective performance for a long time, and extending the service life of the photovoltaic frame bolts. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of an anti-corrosion sleeve for photovoltaic frame bolts according to Embodiment 1 of this utility model.

[0020] Figure 2 This is a cross-sectional view of a corrosion-resistant sleeve for photovoltaic frame bolts according to Embodiment 2 of this utility model.

[0021] Figure 3This is a cross-sectional view of a corrosion-resistant sleeve for photovoltaic frame bolts, according to Embodiment 3 of this utility model.

[0022] Figure 4 This is a cross-sectional view of a corrosion-resistant sleeve for photovoltaic frame bolts, according to Embodiment 4 of this utility model. Detailed Implementation

[0023] The following detailed description illustrates the specific implementation method:

[0024] The reference numerals in the accompanying drawings include: 1. Fixing cylinder; 2. Insulation layer; 3. Anti-aging layer; 4. First sealing ring; 5. Protective cylinder; 6. Second sealing ring; 7. Adjusting cylinder; 8. Sealing gasket.

[0025] Example 1 is basically as shown in the appendix. Figure 1 As shown: A corrosion-resistant sleeve for photovoltaic frame bolts includes a fixing cylinder 1 with one open end. The fixing cylinder 1 is made of PTFE plastic. The inner wall of the opening end of the fixing cylinder 1 is provided with an internal thread for use with the screw of the photovoltaic frame bolt. The outer wall of the fixing cylinder 1 is covered with a heat insulation layer 2 and an anti-aging layer 3 from the inside to the outside. The heat insulation layer 2 is made of closed-cell foamed fluororubber, and the anti-aging layer 3 is made of titanium dioxide. The opening end of the fixing cylinder 1 is provided with an annular groove, and a first sealing ring 4 is provided in the groove.

[0026] The specific implementation process is as follows: A fixed cylinder 1 with internal threads is manufactured using PTFE plastic through injection molding. The cylinder wall thickness is 2mm. Plasma etching is performed on the outer wall of the fixed cylinder 1 to form micron-level pits with a roughness Ra = 3.2μm. Closed-cell foamed fluororubber prepolymer is sprayed onto the outer wall of the fixed cylinder 1 with a spray thickness of 1.2mm. The coating is then foamed and cured in an oven at 120℃ to form a heat insulation layer 2 with an independent closed-cell structure. A 0.1mm thick layer of nano-titanium dioxide particles is deposited on the surface of the heat insulation layer 2 using a vapor deposition process as an anti-aging layer 3.

[0027] In use, the anti-corrosion sleeve is screwed onto the exposed part of the bolt shank via a threaded connection. The first sealing ring 4 abuts against the nut. The fixing sleeve 1 isolates the exposed part of the bolt shank from the external environment. The heat insulation layer 2 and the anti-aging layer 3 play their respective protective roles.

[0028] Example 2 is basically as shown in the appendix. Figure 2 As shown, the only difference between this embodiment and Embodiment 1 is that: the opening end of the fixing cylinder 1 is integrally formed with a protective cylinder 5 for accommodating the nuts of the photovoltaic frame bolts. The protective cylinder 5 is made of PTFE plastic. The fixing cylinder 1 and the protective cylinder 5 are coaxial. The opening end of the fixing cylinder 1 extends to one side of the protective cylinder 5 and passes through it. The groove and the first sealing ring 4 are provided at the opening end of the protective cylinder 5. The heat insulation layer 2 and the anti-aging layer 3 extend to the end of the opening end of the protective cylinder 5.

[0029] The specific implementation process is as follows: When in use, the anti-corrosion sleeve is screwed onto the exposed part of the bolt shank through a threaded connection, the nut is located inside the protective sleeve 5, and the first sealing ring 4 is held against the photovoltaic frame.

[0030] Example 3 is basically as shown in the appendix. Figure 3 As shown, the only difference between this embodiment and embodiment 2 is that: the outer wall of the opening end of the protective cylinder 5 is provided with an external thread section, and the protective cylinder 5 is threadedly connected to the adjusting cylinder 7 through the external thread section. The adjusting cylinder 7 is made of PTFE plastic, and the groove and the first sealing ring 4 are provided at the end of the adjusting cylinder 7 away from the fixed cylinder 1. The heat insulation layer 2 and the anti-aging layer 3 extend to the external thread section of the protective cylinder 5; the end of the adjusting cylinder 7 close to the fixed cylinder 1 extends to the anti-aging layer 3 and fits against it. The inner wall of the adjusting cylinder 7 is provided with an annular limiting groove, and the limiting groove is provided with a second sealing ring 6. In the initial state, the limiting groove faces the anti-aging layer 3.

[0031] The specific implementation process is as follows: When in use, the anti-corrosion sleeve is screwed onto the exposed part of the bolt shank through a threaded connection. The nut is located inside the protective cylinder 5, and the first sealing ring 4 is held against the photovoltaic module. The degree of contact between the first sealing ring 4 and the photovoltaic frame can be adjusted by rotating the adjusting cylinder 7.

[0032] Example 4 is basically as shown in the appendix. Figure 4 As shown, the only difference between it and embodiment 3 is that the first sealing ring 4 is integrally formed with a sealing gasket 8, the sealing gasket 8 covers the open end of the protective cylinder 5, and the sealing gasket 8 is provided with a through hole that is interference fit with the screw of the photovoltaic frame bolt.

[0033] The specific implementation process is as follows: When in use, the anti-corrosion sleeve is screwed onto the exposed part of the bolt shank through a threaded connection. The nut is located inside the protective cylinder 5, and the sealing gasket 8 is held against the photovoltaic module. The degree of contact between the sealing gasket 8 and the photovoltaic frame can be adjusted by rotating the adjusting cylinder 7.

[0034] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A corrosion-resistant sleeve for photovoltaic frame bolts, characterized in that: It includes a fixed cylinder with one end open. The inner wall of the open end of the fixed cylinder is provided with an internal thread that mates with the screw of the photovoltaic frame bolt. The outer wall of the fixed cylinder is covered with a heat insulation layer and an anti-aging layer from the inside out.

2. The anti-corrosion sleeve for photovoltaic frame bolts according to claim 1, characterized in that: The fixed cylinder has an integrally formed protective cylinder at its open end for accommodating the nuts of the photovoltaic frame bolts. The fixed cylinder and the protective cylinder are coaxial, and the open end of the fixed cylinder extends toward one side of the protective cylinder and passes through it.

3. The anti-corrosion sleeve for photovoltaic frame bolts according to claim 2, characterized in that: The protective cylinder has an annular groove at its open end, and a first sealing ring is provided inside the groove.

4. The anti-corrosion sleeve for photovoltaic frame bolts according to claim 3, characterized in that: The heat insulation layer and the anti-aging layer extend to the end of the protective cylinder opening.

5. The anti-corrosion sleeve for photovoltaic frame bolts according to claim 4, characterized in that: An adjusting cylinder with an axial direction is threadedly connected to the outer wall of the open end of the protective cylinder, and the groove and the first sealing ring are located at the end of the adjusting cylinder away from the fixed cylinder.

6. The anti-corrosion sleeve for photovoltaic frame bolts according to claim 5, characterized in that: The first sealing ring is integrally formed with a sealing gasket, which covers the open end of the protective cylinder. The sealing gasket has a through hole that is interference-fitted with the screw of the photovoltaic frame bolt.

7. The anti-corrosion sleeve for photovoltaic frame bolts according to claim 6, characterized in that: The inner wall of the regulating cylinder is provided with an annular limiting groove, and a second sealing ring is provided in the limiting groove. The limiting groove is located near the end of the regulating cylinder away from the first sealing ring.

8. The anti-corrosion sleeve for photovoltaic frame bolts according to claim 7, characterized in that: The fixing cylinder, protective cylinder, and adjusting cylinder are all made of plastic.

9. A corrosion-resistant sleeve for photovoltaic frame bolts according to any one of claims 1 to 8, characterized in that: The insulation layer is made of closed-cell foamed fluororubber.

10. The anti-corrosion sleeve for photovoltaic frame bolts according to claim 9, characterized in that: The anti-aging layer is made of titanium dioxide.

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