A solar cell module with high conversion efficiency

Abstract

The application relates to the technical field of photovoltaic modules, in particular to a high-conversion-efficiency solar cell module which comprises a solar module, a self-adaptive descaling assembly for assembling the solar module, a plate-arc adaptive assembly installed in the self-adaptive descaling assembly and a curvature stability-increasing assembly installed on the plate-arc adaptive assembly; the plate-arc adaptive assembly comprises a bearing plate, two positioning grooves are formed in the bottom of the bearing plate, and two side edge plates are movably installed on the two sides of the bearing plate. The plate-arc adaptive assembly is used to replace the existing fixed frame structure of the aluminum alloy frame, two protective plates are movably installed outside the two side edge plates, the solar cell module is fixed by the clamping seat in the protective plate, when the solar cell module has a curvature in structure, the side bending of the plate-arc adaptive assembly is adjusted to realize the solar cell module with a specific structure, so that the device can quickly adapt to the solar cell modules with different curvatures.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic module technology, specifically to a high-conversion-efficiency solar cell module. Background Technology

[0002] A solar cell module consists of high-efficiency crystalline silicon solar cells, ultra-white textured tempered glass, EVA, transparent TPT backsheet, and aluminum alloy frame. Since the output voltage of a single solar cell is relatively low, and the electrodes of unencapsulated cells are prone to detachment due to environmental influences, a certain number of individual cells must be sealed in series and parallel.

[0003] Depending on the application requirements, when solar cell modules are performing photoelectric conversion under sunlight, airflow in the environment carries away dirt. When the airflow passes over the outer surface of the solar cell module, it is blocked by the outer surface of the module, and the airflow becomes advection. The dirt carried by the advection will quickly adhere to the lens. As the dirt increases, the photoelectric conversion efficiency of the photovoltaic module will decrease. In severe cases, it will also increase the corrosion of the protective gear. Furthermore, the specific structure of the aluminum alloy frame has lower adaptability to solar cell modules with different curvatures, which limits its practical use.

[0004] Therefore, a high-conversion-efficiency solar cell module was designed to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0006] Therefore, the technical solution adopted in this invention is as follows:

[0007] A high-conversion-efficiency solar cell module includes a solar cell module, an adaptive descaling module for assembling the solar cell module, a plate-arc adapter module installed within the adaptive descaling module, and a curvature stabilizing module installed on the plate-arc adapter module. The plate-arc adapter module includes a load-bearing plate with two positioning grooves at its bottom, two side plates movably mounted on both sides of the load-bearing plate, an elastic back plate disposed at the bottom of the load-bearing plate and the two side plates, and two symmetrically distributed vertical rods and a first spring disposed outside the vertical rods are fixedly mounted at both ends of the top of the side plates. The adaptive descaling component includes a protective plate movably mounted on the outside of the side plate, with two limiting holes inside the protective plate. Two vertical rods are adapted to pass through the two limiting holes. Slider blocks are fixedly mounted at both ends of the protective plate. A flexible outer plate is mounted on the outer ends of the load-bearing plate and the two side plates. A light-transmitting plate is movably mounted inside the flexible outer plate. There are two protective plates, and each of the two protective plates has a sliding track on its inner side. The light-transmitting plate is movably mounted in the two sliding tracks. The curvature stabilization component is used to enhance the support force on the inner side of the curved solar module and improve the vibration resistance of the solar module.

[0008] In a preferred embodiment, the present invention can be further configured as follows: the curvature stabilization component includes four first bases, which are evenly distributed at both ends of the top of the load-bearing plate. Two of the first bases are equipped with screws, and screw sleeves are movably installed on the threaded section of the screws. A second support plate is movably installed outside the screw sleeves, and two traction rods are movably installed at both ends of the second support plate, with the end of the traction rod movably installed at the other end.

[0009] Two first trusses are movably installed within two horizontally symmetrical first bases, and there are two first trusses in total, with the ends fixedly installed on the first trusses.

[0010] In a preferred embodiment, the present invention may be further configured such that: the curvature stabilization component further includes four second bases, and the four second bases are respectively mounted on two side plates, and a second truss is movably installed in the two second bases;

[0011] There are two second trusses, and the second truss has the same structure as the first truss.

[0012] In a preferred embodiment, the present invention can be further configured such that both the first truss and the second truss are composed of two T-shaped sliding columns and rubber strips, with the rubber strips attached to the back of the solar module.

[0013] In a preferred embodiment, the present invention can be further configured as follows: a clamp is fixedly installed in the middle of the bottom surface of the side plate, two clamps are attached to the bottom of the load-bearing plate, three bolts are inserted into the clamps and fixed inside the load-bearing plate, an adjusting screw is movably installed in the two clamps, a first support plate is movably installed on the threaded section of the adjusting screw, two lever arms are movably installed at both ends of the first support plate, and the other end of the lever arm is movably installed on the clamp.

[0014] In a preferred embodiment, the present invention can be further configured such that: two pads are fixedly installed in the middle of the bottom surface of the load-bearing plate, and the inner wall of the pads is provided with a vertical groove, and the first support plate is adapted to penetrate into the vertical groove;

[0015] The bottom of the pad has an elliptical pre-installed hole.

[0016] In a preferred embodiment, the present invention can be further configured such that: a slot is provided at the bottom of the side plate, and four clips are fixedly installed on the outside of the side plate, with the clamps inserted into the slots, and the number of clamps is two;

[0017] The two clamps are used to press the elastic back plate, and the elastic back plate has a round hole inside that is adapted to the locking block, and the elastic back plate is locked in the positioning groove.

[0018] In a preferred embodiment, the present invention can be further configured as follows: the top of the protective plate has two through holes; an end plate is fixedly installed on the outside of the light-transmitting plate and is movably installed in the through holes; the bottom end of the second spring is fixedly installed on the end plate and the top end of the second spring is fixedly installed on the inner wall of the through holes; a vertical plate is installed on the outside of the end plate and is adapted to fit against the outer wall of the protective plate; and a wing plate is fixedly installed on the outer end of the end plate.

[0019] In a preferred embodiment, the present invention may be further configured such that the wing plate is a lightweight thin plate with a triangular structure, and the outer wall of the wing plate is coated with an anti-corrosion paint layer.

[0020] In a preferred embodiment, the present invention can be further configured such that: a mounting bracket is fixedly installed on the inner wall of the protective plate, and the side of the solar panel is installed in the mounting bracket.

[0021] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows:

[0022] 1. This invention uses a plate-arc adapter component to replace the aluminum alloy frame of the existing fixed frame structure, and two protective plates are movably installed on the outside of the two side plates. The solar cell module is fixed by the card slots inside the protective plates. When the solar cell module has structural curvature, the side curvature of the plate-arc adapter component is adjusted to realize the solar cell module with a specific structure, thereby improving the device's ability to quickly adapt to solar cell modules with different curvatures.

[0023] 2. The present invention movably installs a light-transmitting plate on the inner side of two protective plates, and pre-installs the two sides of the light-transmitting plate in two slides. When the airflow in the environment passes through the outer side of the two protective plates, the airflow will apply pressure to the two wing plates after passing through the protective plates. Under the coordinated operation of four second springs, the two wing plates and the light-transmitting plate will generate high-frequency vibration, thereby avoiding the adhesion of dirt carried by the airflow to the outer surface of the light-transmitting plate.

[0024] 3. The present invention installs four symmetrically distributed first bases on the top of the load-bearing plate and two second bases fixedly installed on the two side plates respectively. The first and second trusses are movably installed in the grooves of the first and second bases. With the side bending of the load-bearing plate and the two side plates, the two first trusses and the two second trusses provide effective support for the inner curved surface of the solar cell module, avoiding damage to the solar cell module caused by vibration. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the use of the present invention;

[0026] Figure 2 This is a bottom view diagram of the present invention;

[0027] Figure 3This is an exploded view of the plate arc adapter component of the present invention;

[0028] Figure 4 For the present invention Figure 3 Enlarged view of point B in the middle;

[0029] Figure 5 For the present invention Figure 3 Enlarged view of point A in the middle;

[0030] Figure 6 This is a schematic diagram of the curvature stabilization component of the present invention;

[0031] Figure 7 For the present invention Figure 6 Enlarged view of point C in the middle;

[0032] Figure 8 This is a schematic diagram of the adaptive descaling component of the present invention;

[0033] Figure 9 For the present invention Figure 8 Enlarged view of point D in the middle;

[0034] Figure 10 This is an exploded view of the adaptive descaling component of the present invention;

[0035] Figure 11 For the present invention Figure 10 Enlarged diagram of point E in the middle.

[0036] Figure label:

[0037] 100. Plate arc adapter assembly; 110. Load-bearing plate; 1101. Positioning groove; 120. Side plate; 1201. Slot; 1202. Block; 130. Clamp; 1301. Lever arm; 1302. First support plate; 1303. Adjustable screw; 1304. Clamp seat; 1305. Bolt; 140. Foot pad; 150. Vertical rod; 160. First spring; 170. Clamping plate; 180. Elastic back plate;

[0038] 200. Adaptive descaling component; 210. Protective plate; 2101. Limiting hole; 2102. Slide rail; 2103. Through hole; 220. Flexible outer plate; 230. Card holder; 240. Slider; 250. Light-transmitting plate; 2501. End plate; 2502. Vertical plate; 2503. Wing plate; 2504. Second spring;

[0039] 300. Curvature stabilization component; 310. First base; 320. First truss; 330. End; 3301. Traction rod; 3302. Second support plate; 3303. Screw sleeve; 3304. Screw; 340. Second truss; 350. Second base;

[0040] 400. Solar modules. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0042] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0043] The following describes, with reference to the accompanying drawings, some embodiments of a high-conversion-efficiency solar cell module provided by the present invention.

[0044] Example 1:

[0045] Combination Figures 1 to 11 As shown, the present invention provides a high-conversion-efficiency solar cell module, including a solar cell module 400, an adaptive descaling module 200 for mounting the solar cell module 400, a plate arc adaptation module 100 installed in the adaptive descaling module 200, and a curvature stabilizing module 300 installed on the plate arc adaptation module 100. The plate arc adaptation module 100 is used to adapt to solar cells 400 with different structures. The adaptive descaling module 200 is used to provide light-transmitting areas for solar cells 400 with different structures and reduce the interference of dirt on the photoelectric conversion of solar cells 400. The curvature stabilizing module 300 is used to enhance the compressive strength of solar cells 400 with different structures.

[0046] The plate arc adapter assembly 100 includes a load-bearing plate 110, and the bottom of the load-bearing plate 110 is provided with two positioning grooves 1101. Two side plates 120 are movably installed on both sides of the load-bearing plate 110. An elastic back plate 180 is provided at the bottom of the load-bearing plate 110 and the two side plates 120. Two symmetrically distributed vertical rods 150 and a first spring 160 provided outside the vertical rods 150 are fixedly installed at both ends of the top of the side plates 120.

[0047] A clamp 130 is fixedly installed in the middle of the bottom surface of the side plate 120. Two clamps 1304 are attached to the bottom of the load-bearing plate 110. Three bolts 1305 are inserted into the clamps 1304 and fixed inside the load-bearing plate 110. An adjusting screw 1303 is movably installed in the two clamps 1304. A first support plate 1302 is movably installed on the threaded section of the adjusting screw 1303. Two lever arms 1301 are movably installed at both ends of the first support plate 1302, and the other end of the lever arm 1301 is movably installed on the clamp 130.

[0048] Two feet 140 are fixedly installed in the middle of the bottom surface of the load-bearing plate 110, and the inner wall of the feet 140 is provided with a vertical groove, and the first support plate 1302 is adapted to pass through the vertical groove.

[0049] The bottom of the foot 140 has an oval pre-installed hole;

[0050] The bottom of the side plate 120 is provided with a slot 1201, and four clips 1202 are fixedly installed on the outside of the side plate 120. The clamping plate 170 is inserted into the slot 1201, and there are two clamping plates 170.

[0051] Two clamping plates 170 are used to press the elastic back plate 180, and the elastic back plate 180 has a round hole inside that is adapted to the locking block 1202.

[0052] The adaptive descaling assembly 200 includes a protective plate 210 movably installed on the outside of the side plate 120, and two limiting holes 2101 are provided inside the protective plate 210. Two vertical rods 150 are adapted to pass through the two limiting holes 2101. Slider blocks 240 are fixedly installed at both ends of the protective plate 210. A flexible outer plate 220 is installed on the outer ends of the load-bearing plate 110 and the two side plates 120. A light-transmitting plate 250 is movably installed inside the flexible outer plate 220.

[0053] There are two guard plates 210, and the inner side of each guard plate 210 is provided with a slide rail 2102. The light-transmitting plate 250 is movably installed in the two slide rails 2102.

[0054] The curvature stabilization component 300 is used to enhance the support force on the inner side of the curved structure solar module 400 and improve the vibration resistance of the solar module 400.

[0055] According to the assembly requirements of different structure solar modules 400, the adjusting screw 1303 is pre-adjusted. The first support plate 1302 is raised and lowered along the threaded section of the adjusting screw 1303. During the raising and lowering of the first support plate 1302, the two lever arms 1301 connected at both ends will pull the two clamps 130 and the two side plates 120 to bend outward. As the two side plates 120 bend outward in sync until they are adapted to the structure of the solar module 400, the rotation of the adjusting screw 1303 can be stopped.

[0056] The two flexible outer panels 220 deform as the two side panels 120 bend. The four vertical rods 150 are used to enhance the support of the two protective panels 210 after bending, ensuring that the side panels 120 and protective panels 210 always maintain consistency after bending. They also work with the two deformed flexible outer panels 220 to form an arc-shaped cavity, thereby providing effective protection for the curved solar module 400.

[0057] The interior of the two clamps 1304 is coated with lubricating oil, and the top end of the adjusting screw 1303 is engaged in the cavity of the two clamps 1304 after they are closed.

[0058] Example 2:

[0059] Combination Figures 8 to 11 As shown, based on Embodiment 1, the top of the protective plate 210 has two through holes 2103. An end plate 2501 is fixedly installed on the outside of the light-transmitting plate 250, and the end plate 2501 is movably installed in the through holes 2103. The bottom end of the second spring 2504 is fixedly installed on the end plate 2501, and the top end of the second spring 2504 is fixedly installed on the inner wall of the through holes 2103. A vertical plate 2502 is installed on the outside of the end plate 2501, and the vertical plate 2502 is adapted to fit against the outer wall of the protective plate 210. A wing plate 2503 is fixedly installed on the outer end of the end plate 2501.

[0060] The wing plate 2503 is a lightweight thin plate with a triangular structure, and the outer wall of the wing plate 2503 is coated with an anti-corrosion paint layer.

[0061] The inner wall of the protective plate 210 is fixedly installed with a bracket 230, and the side of the solar module 400 is installed in the bracket 230.

[0062] Preferably, the flexible outer plate 220 has two slots distributed longitudinally at both ends, and the slider 240 is movably installed in the slot at the top of the outer end of the flexible outer plate 220. When the flexible outer plate 220 is bent along the center of the load-bearing plate 110, the slider 240 can enhance the stability of both ends of the flexible outer plate 220 after the bend.

[0063] When the airflow passes over the outside of the two protective plates 210, the wing plate 2503, which is pressurized by the airflow, will vibrate under the reset and pressurization of the second spring 2504. The light-transmitting plate 250 connected by the end plate 2501 will resonate along the inner side of the two slides 2102. At this time, the dirt that falls down due to the airflow forming a horizontal state on the outer surface of the light-transmitting plate 250 can be shaken off, thereby avoiding the dirt from blocking the photoelectric conversion of the solar module 400. The high-cleanliness light-transmitting plate 250 can enhance the photoelectric conversion efficiency of the solar module 400.

[0064] Example 3:

[0065] Combination Figures 3 to 7 As shown, in the above embodiment, the curvature stabilization component 300 includes four first bases 310 and four second bases 350, and the four first bases 310 are evenly distributed at both ends of the top of the load-bearing plate 110. Screws 3304 are installed in two of the first bases 310, and screw sleeves 3303 are movably installed on the threaded section of the screws 3304. The second support plate 3302 is movably installed outside the screw sleeves 3303. Two traction rods 3301 are movably installed at both ends of the second support plate 3302, and the end head 330 is movably installed at the other end of the traction rod 3301.

[0066] Two first trusses 320 are movably installed within two horizontally symmetrical first bases 310, and there are two first trusses 320, while the end 330 is fixedly installed on the first truss 320.

[0067] Four second bases 350 are respectively installed on two side plates 120, and a second truss 340 is movably installed inside the two second bases 350;

[0068] There are two second trusses 340, and the second trusses 340 and the first truss 320 have the same structure.

[0069] The first truss 320 and the second truss 340 are both composed of two T-shaped sliding columns and rubber strips, with the rubber strips attached to the back of the solar module 400.

[0070] Preferably, both the first base 310 and the second base 350 are trapezoidal structures. The first base 310 is welded or glued to the top of the load-bearing plate 110, and the second base 350 is also welded or glued to the top of the side plate 120. Welding can enhance the compressive strength of the first base 310 and the second truss 340 to the back of the solar module 400, while gluing can be adjusted appropriately according to the curvature and width of the solar module 400.

[0071] The threaded sleeve 3303 is welded together from an I-shaped head and a hexagonal end. The I-shaped head is movably installed inside the second support plate 3302, and a cylindrical hole is opened inside the I-shaped head, with the threaded hole located inside the hexagonal end.

[0072] The working principle and usage process of this invention: According to the usage requirements, the pad 140 is fixedly installed on the bracket or load-bearing object to be installed in advance using combination bolts;

[0073] When the solar panel 400 to be installed has a curved structure, by adjusting the pitch screw 1303, as the pitch screw 1303 reverses, the first support plate 1302 will descend along the threaded section of the pitch screw 1303. The descending first support plate 1302 will pull the two lever arms 1301 to extend synchronously. Finally, the two lever arms 1301 will pull the welded clamp 130 and the side plate 120 to bend laterally. The two side plates 120 will be pressed and flip along both sides of the load-bearing plate 110. At this time, the load-bearing plate 110 and the two side plates 120 after bending laterally will form an arc-shaped structure.

[0074] At the same time, after the two side plates 120 are bent under pressure, the two flexible outer plates 220 assembled at both ends of the side plates 120 will also bend accordingly. The two brackets 230 fixed on the inner wall of the two protective plates 210 can fix the solar module 400 with a specific structure. The light-transmitting plate 250 is located directly above the solar module 400. After the angle is adjusted, the device on the support can perform photoelectric conversion of solar energy.

[0075] Once airflow is generated in the external environment and carries away dirt, the blown dirt will affect the conversion efficiency of the solar cell module. Therefore, in order to avoid the airflow carrying dirt from affecting the photoelectric conversion efficiency of the solar cell module, after the airflow passes through the outside of the two protective plates 210, the two wing plates 2503 driven by the airflow will drive the light-transmitting plate 250 to vibrate. Under the reset pressure of the four second springs 2504, the light-transmitting plate 250 will vibrate at high frequency along the inside of the two protective plates 210. During the vibration, the light-transmitting plate 250 can shake off the dirt on its outer surface. At the same time, the light-transmitting plate 250 in the vibrating state can also reduce the adhesion of dirt to its outer surface, thereby improving the high light transmittance of the light-transmitting plate 250, and thus improving the photoelectric conversion efficiency of the solar cell module 400 with a specific structure.

[0076] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-conversion-efficiency solar cell module, comprising a solar module (400), characterized in that, It also includes an adaptive descaling module (200) for assembling solar modules (400), a plate arc adapter module (100) installed in the adaptive descaling module (200), and a curvature stabilizing module (300) installed on the plate arc adapter module (100). The plate arc adapter assembly (100) includes a load-bearing plate (110), the bottom of which has two positioning grooves (1101), two side plates (120) are movably installed on both sides of the load-bearing plate (110), and an elastic back plate (180) is provided at the bottom of the load-bearing plate (110) and the two side plates (120). Two symmetrically distributed vertical rods (150) and a first spring (160) are fixedly installed at both ends of the top of the side plates (120). The curvature stabilization component (300) is used to enhance the support force on the inner side of the curved structure solar module (400) and improve the vibration resistance of the solar module (400); The curvature stabilization component (300) includes four first bases (310), and the four first bases (310) are evenly distributed at both ends of the top of the load-bearing plate (110). Two of the first bases (310) are provided with second support plates (3302) on their inner sides. Two traction rods (3301) are movably installed at both ends of the second support plates (3302), and an end head (330) is movably installed at the other end of the traction rods (3301). Two first bases (310) are movably installed with first trusses (320), and there are two first trusses (320). The ends (330) are fixedly installed on the first trusses (320). The curvature stabilization component (300) also includes four second bases (350), and the four second bases (350) are respectively installed on two side plates (120), and a second truss (340) is movably installed in the two second bases (350). There are two second trusses (340), and the second truss (340) and the first truss (320) have the same structure.

2. The high conversion efficiency solar cell module according to claim 1, characterized in that, The first truss (320) and the second truss (340) are both composed of two T-shaped sliding columns and rubber strips, with the rubber strips attached to the back of the solar module (400).

3. A high-conversion-efficiency solar cell module according to claim 1, characterized in that, A clamp (130) is fixedly installed in the middle of the bottom surface of the side plate (120). Two clamps (1304) are attached to the bottom of the load-bearing plate (110). An adjusting screw (1303) is movably installed in the two clamps (1304). A first support plate (1302) is movably installed on the threaded section of the adjusting screw (1303). A lever arm (1301) is movably installed at both ends of the first support plate (1302). The other end of the lever arm (1301) is movably installed on the clamp (130).

4. A high-conversion-efficiency solar cell module according to claim 3, characterized in that, Two pads (140) are fixedly installed in the middle of the bottom surface of the load-bearing plate (110), and the inner wall of the pads (140) is provided with a vertical groove, and the first support plate (1302) is adapted to pass through the vertical groove. The bottom of the foot (140) has an elliptical pre-installed hole.

5. A high-conversion-efficiency solar cell module according to claim 1, characterized in that, The bottom of the side plate (120) is provided with a slot (1201), and four clips (1202) are fixedly installed on the outside of the side plate (120). The clamping plate (170) is inserted into the slot (1201), and there are two clamping plates (170). The two clamps (170) are used to press the elastic back plate (180), the elastic back plate (180) has a round hole adapted to the locking block (1202) inside, and the elastic back plate (180) is locked in the positioning groove (1101).

6. A high-conversion-efficiency solar cell module according to claim 1, characterized in that, The adaptive descaling assembly (200) includes a protective plate (210) movably installed outside the side plate (120), and the protective plate (210) has two limiting holes (2101) inside. Two vertical rods (150) are adapted to pass through the two limiting holes (2101). Slider blocks (240) are fixedly installed at both ends of the protective plate (210). A flexible outer plate (220) is installed at the outer ends of the load-bearing plate (110) and the two side plates (120). A light-transmitting plate (250) is movably installed inside the flexible outer plate (220).

7. A high-conversion-efficiency solar cell module according to claim 6, characterized in that, There are two guard plates (210), and the inner side of each guard plate (210) is provided with a slide rail (2102). The light-transmitting plate (250) is movably installed in the two slide rails (2102). The top of the guard plate (210) has two through holes (2103). An end plate (2501) is fixedly installed on the outside of the light-transmitting plate (250), and the end plate (2501) is movably installed in the through hole (2103). The bottom end of the second spring (2504) is fixedly installed on the end plate (2501), and the top end of the second spring (2504) is fixedly installed on the inner wall of the through hole (2103). A vertical plate (2502) is installed on the outside of the end plate (2501), and the vertical plate (2502) is adapted to fit against the outer wall of the guard plate (210). A wing plate (2503) is fixedly installed on the outer end of the end plate (2501). The inner wall of the protective plate (210) is fixedly installed with a bracket (230), and the side of the solar module (400) is installed in the bracket (230).

8. A high-conversion-efficiency solar cell module according to claim 7, characterized in that, The wing plate (2503) is a lightweight thin plate with a triangular structure, and the outer wall of the wing plate (2503) is coated with an anti-corrosion paint layer.

Images