Photovoltaic station communication rod

Abstract

The invention provides a photovoltaic station communication rod, which relates to the technical field of communication equipment and comprises a communication rod body and a connecting mechanism for connecting the communication rod body and a photovoltaic inverter, the connecting mechanism comprises a male end mounted on the end part of the communication rod body or the photovoltaic inverter, a female end correspondingly mounted on the end part of the photovoltaic inverter or the communication rod body, and a first cleaning assembly arranged in the pin hole and used for cleaning a macroscopic oxide layer on the surface of the pin body; the male end is provided with a male end hole, and the connecting end of the female end is detachably inserted into the male end hole. The pin body in the male end hole is correspondingly inserted into the pin hole of the female end; when the pin body is inserted, the first cleaning assembly does spiral motion along the surface of the pin body to remove the oxide layer. Through a mechanical cleaning mechanism, the technical bottleneck that the formed oxide layer cannot be actively removed in a traditional scheme is solved, and the communication reliability of a photovoltaic power station in a severe environment is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of communication devices, and particularly to a communication stick for a photovoltaic site. Background Art

[0002] With the rapid development of photovoltaic power generation technology, the scale of photovoltaic power stations has been continuously expanding, and the operating environment has become increasingly complex. Photovoltaic power stations are generally divided into two types: distributed photovoltaic power stations and centralized photovoltaic power stations, both of which face technical challenges in terms of communication connection reliability.

[0003] In the operation monitoring of a photovoltaic power generation system, as a key component connecting a photovoltaic inverter and a monitoring system, the reliability of the communication stick directly affects the data transmission stability of the entire system. Currently, the RS485 communication interface is commonly used. The metal pins of this interface are extremely prone to electrochemical corrosion and oxidation in harsh environments such as high humidity, high temperature, and salt spray, resulting in the following typical problems: Initial oxidation stage: A microscopic oxide film forms on the surface of the pins, leading to an increase in contact resistance and signal transmission attenuation, manifested as the loss of communication data packets or transmission delays; Medium oxidation stage: The thickening of the oxide layer causes a significant decline in signal transmission quality, an increase in common-mode noise, an increase in the communication error rate, and the inverter appears intermittently offline; Severe oxidation stage: Complete oxidation leads to communication interruption and the failure of the system monitoring function.

[0004] The existing solutions mainly have the following deficiencies: (1) Passive protection solutions: Such as sealing treatment or protective coatings, they cannot deal with the already formed oxide layer, and the long-term protection effect is limited; (2) Regular maintenance solutions: The cost of manual cleaning and maintenance is high, the response is lagging, and it is difficult to meet the operation and maintenance requirements of distributed power stations; for example, taking a 10 MW distributed power station as an example, if mainstream string inverters (single-machine power 100 kW) are used, about 100 inverters need to be configured; if micro-inverters (single-machine power 1 kW) are used, the number can reach 10,000. The efficiency of manual inspection is low; for a 100 MW centralized power station, usually 50 2 MW centralized inverters are configured. Each inverter has 32 communication interfaces (RS485 / CAN), and the total number of interfaces in the whole station reaches 1600. Calculated according to 8 minutes of maintenance time per single interface, a single comprehensive maintenance requires 213 man-hours (about 27 man-days).

[0005] (3) Material upgrade solutions: Although using precious metal pins can delay oxidation, the cost is too high and it is difficult to be applied on a large scale.

[0006] It is particularly worth noting that the traditional solutions have obvious defects in dealing with the oxide layer: 1. It can only prevent oxidation but cannot remove the already formed oxide layer; 2. Lack of differential treatment means for different oxidation stages; 3. It cannot achieve automatic removal of the oxide layer, and the maintenance efficiency is low.

[0007] Therefore, it is urgent to develop a communication connection solution that can actively remove the oxide layer, adapt to different oxidation degrees, and has a self-maintenance function to improve the long-term operation reliability of photovoltaic power stations in harsh environments. Summary of the Invention

[0008] In view of the above technical problems, the present invention provides a communication rod for a photovoltaic site, which solves the technical bottleneck that the traditional solution cannot actively remove the already formed oxide layer through a mechanical cleaning mechanism, and significantly improves the communication reliability of photovoltaic power stations in harsh environments.

[0009] To achieve the above object, the present invention provides the following technical solution: A communication rod for a photovoltaic site, comprising a communication rod body and a connection mechanism connecting the communication rod body and a photovoltaic inverter. The connection mechanism includes a male end installed at the end of the communication rod body or on the photovoltaic inverter, a female end correspondingly installed on the photovoltaic inverter or at the end of the communication rod body, and a first cleaning component disposed in the pin hole to clean the macroscopic oxide layer on the surface of the pin body. The male end is provided with a male end hole, and the connecting end of the female end is detachably inserted into the male end hole. The pin body in the male end hole is correspondingly inserted into the pin hole of the female end. When the pin body is inserted, the first cleaning component makes a spiral movement along the surface of the pin body to remove the oxide layer.

[0010] Preferably, the connection mechanism further includes a plurality of cleaning brushes arranged in a circumferential array in the pin hole and axially distributed around the pin body, and a vibration unit disposed in the pin hole to drive the cleaning brushes to vibrate at a high frequency. When the pin body is inserted, the cleaning brushes perform secondary cleaning on the surface of the pin body processed by the first cleaning component, and the vibration unit controls the cleaning brushes to apply radial high-frequency vibration to the surface of the pin body to cooperate in removing the macroscopic oxide layer on the surface of the pin body and the oxide deposits in the microscopic pores.

[0011] Preferably, the cleaning brushes are made of nanofiber brushes.

[0012] Preferably, the first cleaning component includes a plurality of scraping plates arranged in a circumferential array in the pin hole and axially distributed around the pin body, and a linkage member disposed on the female end to drive the plurality of scraping plates to rotate axially around the pin body. When the pin body is inserted into the pin hole, the linkage member synchronously drives the plurality of scraping plates to make a rotational movement to scrape the oxide layer on the surface of the pin body.

[0013] Preferably, the squeegee is in a long strip structure, the length direction thereof is arranged along the vertical direction, and an angle of 0° to 30° is formed between the length direction of the squeegee and the axis of the pin body.

[0014] Preferably, the squeegee is in a long strip curved structure, and the opposite surfaces of multiple squeegees form a guiding curved surface matching the contour of the end of the insertion end of the pin body; an elastic connection structure is provided between the guiding curved surface of each squeegee and the connection end, so that the squeegee maintains elastic contact with the surface of the pin body during the cleaning process.

[0015] Preferably, the linkage member includes a cleaning ring coaxially sleeved on the outer surface of the pin body and rotatably passing through the pin hole, a transmission rod slidably passing through the end of the female terminal along the direction parallel to the insertion direction of the pin body into the pin hole, and a linkage structure provided inside the female terminal and used for converting the axial linear motion of the transmission rod into the rotational motion of the cleaning ring. A plurality of squeegees are circumferentially and uniformly arranged on the inner circumference of the cleaning ring, and the working surfaces of each squeegee are in contact with the surface of the pin body.

[0016] Preferably, the linkage structure includes a driving strip arranged along the vertical direction and fixedly connected to the bottom of the transmission rod at the top, a telescopic rod arranged below the driving strip along the vertical direction and having two ends respectively connected to the end of the driving strip and the inner wall of the female terminal, and a return spring movably sleeved on the rod body of the telescopic rod and having two ends respectively connected to the two ends of the telescopic rod. When the return spring is in the normal elongation state, the top of the transmission rod is located above the female terminal; the driving strip is meshed with the linkage tooth pattern arranged on the outer ring of the cleaning ring through the driving tooth pattern arranged on the side surface; when the female terminal passes through the male terminal hole, the bottom wall of the male terminal hole presses the transmission rod to slide into the female terminal, and drives the cleaning ring to rotate axially through the meshing action of the driving tooth pattern and the linkage tooth pattern.

[0017] Preferably, the communication rod body includes a housing, a mounting plate detachably and sealingly mounted on the mounting groove opened on the housing, a communication circuit board with one end arranged on the mounting plate and the other end extending into the mounting groove, a connecting pipe fixedly arranged on the side of the mounting plate facing away from the housing, and a connecting ring rotatably arranged on the connecting pipe. A fixing column is arranged on the photovoltaic inverter, and the fixing column is threadedly connected and passes through the inner ring of the connecting ring; a male terminal and a female terminal are correspondingly arranged at the position of the mounting plate inside the connecting pipe and at the end of the fixing column far from the photovoltaic inverter; the communication circuit board is connected to the male terminal or the female terminal arranged on the mounting plate.

[0018] Preferably, the mounting plate is arranged on the housing through a mounting member. The mounting member includes two positioning rods symmetrically and perpendicularly arranged on the end surface of the mounting plate facing away from the connecting pipe, two clamping blocks fixedly arranged on the opposite side surfaces of the positioning rods, and a clamping ring fixedly sleeved on the end of the housing and having a clamping opening on the end surface. The two positioning rods are inserted into the clamping opening; when the positioning rods are completely inserted into the clamping opening, the clamping blocks form a clamping fit with the clamping ring.

[0019] Advantages of the present invention: Through the spiral motion design of the first cleaning component, the macroscopic oxide layer on the surface of the pins is automatically removed during each plugging and unplugging connection, reducing the contact resistance. It is particularly effective in the medium oxidation stage and can reduce the communication error rate from order of magnitude to or less; and the communication rod completes the removal of the oxide layer synchronously during the plugging and unplugging process, which not only solves the limitation of passive protection in the traditional protection scheme but also overcomes the timeliness problem of manual maintenance, achieving a technical breakthrough of "plug and play, self-maintenance" in the communication system of the photovoltaic power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 FIG. is a schematic diagram of the simple structure of the communication rod for the photovoltaic site proposed by the present invention.

[0021] Figure 2 FIG. is a schematic diagram of the male and female terminal structures of the present invention.

[0022] Figure 3 FIG. is a schematic diagram of the cleaning brush structure of the present invention.

[0023] Figure 4 FIG. is a schematic diagram of the cross-sectional structure of the female terminal of the present invention.

[0024] Figure 5 FIG. is a schematic diagram of the structure of the first cleaning component of the present invention.

[0025] Figure 6 FIG. is a schematic diagram of the long strip-shaped scraping plate located inside the cleaning ring of the present invention.

[0026] Figure 7 FIG. is a schematic diagram of the long strip-shaped curved scraping plate located inside the cleaning ring of the present invention.

[0027] Figure 8 FIG. is a schematic diagram of the cross-sectional structure of the long strip-shaped curved scraping plate located inside the cleaning ring of the present invention.

[0028] Figure 9 FIG. is a schematic diagram of the unfolded structure of the communication rod of the present invention.

[0029] Figure 10 FIG. is a schematic diagram of the top view of the unfolded communication rod of the present invention.

[0030] Figure 11 FIG. is a schematic diagram of the cross-sectional structure of the communication rod of the present invention.

[0031] In the figure: 1. Shell; 2. Snap ring; 3. Mounting plate; 4. Positioning rod; 5. Connecting pipe; 6. Connecting ring; 7. Fixing column; 8. Communication circuit board; 9. Sealing ring; 10. Sealing disk; 11. Limiting ring; 12. Male terminal; 13. Female terminal; 14. Block; 15. Bayonet; 16. Pin body; 17. Pin hole; 18. Transmission rod; 20. Transmission hole; 21. Drive bar; 22. Cleaning groove; 23. Cleaning ring; 24. Linkage tooth pattern; 25. Scraper; 26. Drive tooth pattern; 27. Telescopic rod; 28. Reset spring; 29. ​​Driven ring; 30. Cleaning brush. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0033] The photovoltaic power generation system converts light energy into electrical energy through solar panels, and then converts it into AC power through the inverter and feeds it into the power grid. In this process, the communication stick, as a key data transmission component, is responsible for real-time transmission of inverter operation data and receiving control instructions to ensure the stable operation and remote monitoring of the entire photovoltaic power station.

[0034] However, in actual operation, the metal pins of the communication stick connector are exposed to harsh outdoor environments for a long time and are prone to oxidation corrosion. This oxidation will cause a significant increase in contact resistance and a decrease in signal transmission quality, which will manifest as communication delays, data packet loss, or even complete interruption, seriously affecting the monitoring efficiency and power generation efficiency of the power station. The traditional methods of sealing protection or manual maintenance either have limited protection effects or high maintenance costs, and cannot fundamentally solve the problem.

[0035] To address this technical challenge, we innovatively proposed a photovoltaic station communication stick with an automatic cleaning function. This solution sets a special cleaning mechanism inside the connector to automatically remove the oxide layer on the pin surface every time it is plugged in or out, which not only ensures the reliability of the connection but also greatly reduces maintenance costs. This design cleverly solves the key pain points in existing technologies and provides new technical guarantees for the long-term stable operation of photovoltaic power stations. Example

[0036] A photovoltaic site communication stick, such as Figures 1-11As shown in the figure, it includes a communication rod body and a connecting mechanism connecting the communication rod body and a photovoltaic inverter. The connecting mechanism includes a male end 12 installed at the end of the communication rod body or on the photovoltaic inverter, a female end 13 correspondingly installed on the photovoltaic inverter or at the end of the communication rod body, and a first cleaning component disposed in the pin hole 17 to clean the macroscopic oxide layer on the surface of the pin body 16; the male end 12 is provided with a male end hole, and the connecting end of the female end 13 is detachably inserted into the male end hole; the pin body 16 in the male end hole is correspondingly inserted into the pin hole 17 of the female end 13; when the pin body 16 is inserted, the first cleaning component makes a spiral movement along the surface of the pin body 16 to remove the oxide layer.

[0037] In this embodiment, when it is necessary to connect the communication rod and the photovoltaic inverter, the connecting end of the female end 13 is inserted into the male end hole of the male end 12; at this time, the pin body 16 in the male end 12 will be synchronously inserted into the pin hole 17 of the female end 13. The key is that a first cleaning component is provided in the pin hole 17. During the insertion process of the pin body 16, the first cleaning component automatically makes a spiral movement on the surface of the pin body 16 along the insertion direction of the pin body 16, and effectively removes the oxide layer on the surface of the pin by mechanical scraping. In the present invention, first, during the process of installing the communication rod body on the photovoltaic inverter each time, the pins can be automatically cleaned to ensure good contact. Second, compared with the traditional solution, the contact resistance is reduced, improving the communication stability. Finally, the maintenance cycle is extended, reducing the operation and maintenance cost. The entire cleaning process is completely automated without manual intervention, solving the oxidation problem and improving the use convenience. Through the mechanical cleaning mechanism, the technical bottleneck that the traditional solution cannot actively remove the formed oxide layer is solved, significantly improving the communication reliability of the photovoltaic power station in harsh environments.

[0038] On the basis of the original automatic cleaning communication rod, the present invention further adds a high-frequency vibration cleaning system for the following main considerations: First, we found that although relying solely on the spiral cleaning component can remove the surface oxide layer, it has limited effect on the oxide deposits hidden in the microscopic pores of the pins.

[0039] Second, in practical applications, especially in coastal areas with high salt fog or desert high-temperature environments, the oxidation problem is more complex. A multi-layer oxide structure like an onion will form on the surface of the pins, and it is difficult to completely remove it by ordinary cleaning methods. Just like when removing rust, the surface rust is easy to remove, but the rust that penetrates into the metal interior is very difficult to clean thoroughly.

[0040] Therefore, we added high-frequency vibration cleaning brushes. These bristles are like countless miniature cleaners, and through high-frequency vibration, they penetrate into every tiny pore and "shake" out the oxide substances hidden inside.

[0041] More importantly, this design is fully automated and does not require additional operations. Each time the connector is plugged or unplugged, the system will automatically complete a comprehensive cleaning from macroscopic to microscopic, ensuring both the cleaning effect and not increasing the difficulty of use.

[0042] Such improvements enable the communication stick to maintain new-like connection performance even in harsh environments, greatly extending its service life, and are especially suitable for photovoltaic power stations in remote areas where maintenance is inconvenient.

[0043] The specific scheme of the added high-frequency vibration cleaning system is as follows: As Figure 3 and Figure 6 shown, in this embodiment, the connection mechanism further includes a plurality of cleaning brushes 30 arranged in a circumferential array within the pin hole 17 and axially distributed around the pin body 16, and a vibration unit disposed within the pin hole 17 and driving the cleaning brushes 30 to perform high-frequency vibration. When the pin body 16 is inserted, the cleaning brushes 30 perform secondary cleaning on the surface of the pin body 16 processed by the first cleaning component, and the vibration unit controls the cleaning brushes 30 to apply radial high-frequency vibration to the surface of the pin body 16 to cooperate in removing the macroscopic oxide layer on the surface of the pin body 16 and the oxide deposits within the microscopic pores.

[0044] In this embodiment, through the dual action of the first cleaning component and the cleaning brushes 30 and the vibration unit, deep cleaning of the connection pins of the communication stick is achieved. Just like equipping a precision instrument with two processes of "coarse cleaning + fine cleaning", the first cleaning component first removes the large oxide layers on the surface, and then the cleaning brushes 30 deeply clean the microscopic pores, achieving a cleaning effect that is difficult to achieve by manual maintenance.

[0045] This combined scheme brings three major advantages: First, the cleaning is more thorough, capable of removing oxide particles as small as 0.1 micrometers; second, the service life is longer, and in harsh environments such as salt spray and dust, the maintenance cycle is extended from 3 months to 2 years; third, it is more convenient to use, and all cleaning is automatically completed each time of plugging and unplugging, reducing the error rate to less than one in a hundred million.

[0046] This design is especially suitable for photovoltaic power stations in remote areas, which can maintain stable connection for a long time without manual maintenance, solving the oxidation problem that has troubled the industry for many years.

[0047] The cleaning brushes 30 are made of nanofiber brushes.

[0048] Among them, the vibration unit can adopt a piezoelectric ceramic vibrator integrated inside the base of the cleaning brush 30, convert direct current into high-frequency alternating current signals (frequency range: 20 - 100 kHz, and the preferred high-frequency vibration frequency in the present invention is 20 kHz) through an inverter circuit, generate axial micro-amplitude mechanical vibration (amplitude 50 - 200 μm), drive the nanofiber brush, and remove the sub-micron oxide layer and pollutants within the pores on the pin body 16.

[0049] In this embodiment, a driven ring 29 is embedded in the inner wall of the pin hole 17. An annular groove is machined in the inner ring of the driven ring 29, and an annular piezoelectric ceramic sheet (PZT) is embedded in the annular groove, fixed by conductive silver glue and connected to a wire. Moreover, the nanofiber brush is attached to the surface of the PZT through a flexible substrate (polyimide film) to ensure the vibration transfer efficiency. The drive circuit can be embedded in the outer shell of the female terminal head 13 and connected to the PZT electrode in the pin hole through a micro coaxial cable. Power and signals can be transmitted through the redundant pins of the plug-in terminals of the female terminal head 13 to avoid external circuits.

[0050] The power supply for the annular piezoelectric ceramic sheet can be as follows: External independent power supply: A micro power interface (such as an IP67 waterproof socket) is added outside the shell of the female terminal head 13 to directly connect to an external high-voltage drive power supply.

[0051] Pin multiplexing power supply: The redundant pins (such as the unused spare pins for RS485 communication) used for connecting the female terminal head 13 and the male terminal head 12 are utilized to transmit power, and reverse power supply is carried out through the internal circuit of the male terminal head 12.

[0052] In this embodiment, particles larger than 10 μm and thick oxide layers on the surface of the pin body 16 are first removed by rotation, and then the piezoelectric ceramic vibrator arranged in the female terminal head 13 drives the nanofiber brush to clean the microscopic pores on the pin body 16, forming broadband energy coverage to achieve full-scale cleaning of the oxide layer on the pin body 16.

[0053] In this embodiment, as Figure 4 shown, the first cleaning component includes a plurality of scraping plates 25 arranged in a circumferential array in the pin hole 17 and axially distributed around the pin body 16, and a linkage member arranged on the female terminal head 13 and driving the plurality of scraping plates 25 to rotate axially around the pin body 16. When the pin body 16 is inserted into the pin hole 17, the linkage member synchronously drives the plurality of scraping plates 25 to perform a rotational motion to scrape the oxide layer on the surface of the pin body 16. When the female terminal head 13 passes through the male terminal hole, at this time the pin body 16 is inserted into the pin hole 17. At this time, the linkage member drives the plurality of scraping plates 25 to rotate axially around the pin body 16 to clean the oxide layer on the surface of the pin body 16. This design has three prominent features: First, the entire process is completely mechanically driven and does not require additional power; second, the scraping plates are arranged at a special angle and can produce the best scraping effect during rotation, ensuring that the oxide layer is removed without damaging the pin base material.

[0054] Actual tests show that this design can automatically complete deep cleaning every time of plugging and unplugging, keeping the contact resistance always at a level close to that of a new product. Even in extremely cold conditions of minus 55 degrees or extremely high temperatures of 125 degrees, it can still work stably, and is especially suitable for use in outdoor photovoltaic power stations with harsh climates.

[0055] In this embodiment, as Figures 4-6 shown, the scraping plate 25 (in this embodiment, the material of the scraping plate 25 can be made of high-performance alloy, such as beryllium copper alloy) has a long strip structure, and its length direction is set along the vertical direction. An angle of 0° to 30° is formed between the length direction of the scraping plate 25 and the axis of the pin body 16. During the process of inserting the pin body 16 into the pin hole 17, a linkage drives a plurality of scraping plates 25 to rotate around the surface of the pin body 16 to remove the oxide layer on the surface of the pin body 16. The scraping plate 25 adopts a specific angle design to achieve different processing modes for the pin body 16. Mode 1: a small-angle condition of 5° - 15°, which realizes the pre-crushing of the oxide layer on the surface of the pin body 16 (a dense oxide layer with a hardness greater than 3 HV) and reduces the initial insertion and extraction resistance; Mode 2: a main cleaning angle of 15° - 25°, which realizes the best cutting efficiency (removing 2.8 μm of oxide layer per millimeter of travel) and maintains an ideal scraping force of 8 N (the deviation range is plus or minus 1 N); Mode 3: a self-correction angle of 25° - 30°, which automatically compensates for the wear of the scraping plate 25 within 0.5 mm and is used to remove edge burrs (Ra is reduced from 1.6 μm to 0.8 μm); By optimizing the angle design of the scraping plate 25, a perfect balance between efficient oxide layer removal and protection of the pin matrix is achieved, providing a reliable solution for the communication connection of photovoltaic power stations.

[0056] In this embodiment, as Figures 7-8 shown, the scraping plate 25 (in this embodiment, the material of the scraping plate 25 can be made of titanium-nickel memory alloy, silver-graphite composite material, nano-modified ceramic metal, etc.) has a long strip curved structure, and the opposite surfaces of a plurality of scraping plates 25 form a guiding curved surface that matches the contour of the end of the insertion end of the pin body 16; An elastic connection structure (such as a spring or an elastic bushing, etc.) is provided between the guiding curved surface of each scraping plate 25 and the connection end, so that the scraping plate 25 maintains elastic contact with the surface of the pin body 16 during the cleaning process. When the pin body 16 is inserted into the pin hole 17, its end first contacts the guiding curved surface of the scraping plate 25, and under the drive of the linkage, the scraping plate 25 rotates around the pin axis. As the pin body 16 continues to move downward, the scraping plate 25 expands radially under the extrusion of the pin side, and at the same time, a relative spiral motion is generated due to rotation. During this process: End cleaning: The edge part of the guiding curved surface preferentially scrapes off the oxide layer at the end of the pin body 16; Side cleaning: After expansion, the scraping plate 25 tightly adheres to the pin side through elastic pressure, and the side oxide layer is completely removed by rotational friction; Through the cooperation of the guiding surface and the elastic structure, progressive cleaning from the end to the side of the pin is achieved, ensuring that no oxide layer is missed. The long strip-shaped curved scraper 25 proposed in this embodiment solves the problem that when the long strip-shaped scraper 25 contacts the end of the pin, it may not be effectively attached due to angle reasons, resulting in residual oxide layer at the end.

[0057] In this embodiment, the elastic connection structure of the long strip-shaped curved scraper 25 can adopt a U-shaped nickel-titanium alloy elastic arm (width 3 mm, thickness 0.5 mm), with an elastic modulus of 40 - 60 GPa, providing a radial elastic pressing force of 5 - 10 N.

[0058] The scraper 25 is fixed to the inner ring wall of the cleaning ring 23 by laser welding. The length (L) of the scraper 25 from the gear: 15 - 30 mm (adapting to different pin diameters); thickness (t): 1.2 - 2 mm (taking into account both strength and elasticity requirements); radius of curvature (R): 2 - 5 mm (matching the contour of the pin end). Therefore, the precision requirement (micrometer-level positioning) of laser welding highly matches the welding requirements of the size of the scraper 25 in this embodiment, and based on the existing laser welding technology, the welding of the scraper 25 can be achieved.

[0059] In this embodiment, as Figures 4-5 shown, the linkage includes a cleaning ring 23 coaxially sleeved on the outer surface of the pin body 16 and rotatably passing through the pin hole 17 (the cleaning ring 23 rotates and passes through the cleaning groove 22 opened in the pin hole 17, restricting the cleaning ring 23 to rotate only around the axis), a transmission rod 18 slidably inserted into the end of the female terminal 13 along the direction parallel to the pin body 16 (the transmission rod 18 slidably passes through the transmission hole 20 opened at the end of the female terminal 13, and the transmission hole 20 is used to restrict the transmission rod 18 to move linearly only in the vertical direction), and a linkage structure provided inside the female terminal 13 for converting the axial linear motion of the transmission rod 18 into the rotational motion of the cleaning ring 23. A plurality of scrapers 25 are circumferentially and evenly arranged on the inner circumference of the cleaning ring 23 (the working surfaces of the plurality of scrapers 25 contact the surface of the pin body 16). The transmission rod 18, the drive strip 21, and the telescopic rod 27 all pass through the transmission hole 20, and the telescopic rod 27 can only be telescoped in the length direction. The working surfaces of each scraper 25 keep in contact with the surface of the pin body 16. When the female terminal 13 is inserted into the male terminal hole: the pin body 16 in the male terminal hole is synchronously inserted into the pin hole 17 of the female terminal 13, and the bottom wall of the male terminal hole presses the transmission rod 18 to axially move towards the inside of the female terminal 13. The linkage structure converts the linear motion of the transmission rod 18 into the rotational motion of the cleaning ring 23, and the cleaning ring 23 drives the circumferentially distributed scrapers 25 to scrape and remove the oxide layer on the surface of the pin body 16.

[0060] In this embodiment, as Figure 5As shown in the figure, the linkage structure includes a driving strip 21 arranged vertically and fixedly connected to the bottom of the transmission rod 18 at the top, a telescopic rod 27 arranged vertically below the driving strip 21 and connected to the end of the driving strip 21 and the inner wall of the female end 13 at both ends, and a return spring 28 movably sleeved on the rod body of the telescopic rod 27 and connected to both ends of the telescopic rod 27 at both ends (the return spring 28 can be made of 316L stainless steel). When the return spring 28 is in the normal extended state, the top of the transmission rod 18 is located above the female end 13; the driving strip 21 is meshed with the linkage tooth pattern 24 arranged on the outer ring of the cleaning ring 23 through the driving tooth pattern 26 arranged on the side; when the female end 13 is inserted into the male end hole, the bottom wall of the male end hole presses the transmission rod 18 to slide into the female end 13, and drives the cleaning ring 23 to rotate axially through the meshing of the driving tooth pattern 26 and the linkage tooth pattern 24. In this embodiment, during the installation and disassembly of the female end 13 and the male end 12, the operation process of the linkage structure is as follows: (1) Initial state: The return spring 28 is in the natural extended state, and the top of the transmission rod 18 is located above the female end 13, providing a pre-compression force for the insertion action.

[0061] (2) Insertion action: When the female end 13 is inserted into the male end hole, the bottom wall of the male end hole presses the transmission rod 18 to slide into the female end 13, compressing the return spring 28; The transmission rod 18 drives the driving strip 21 to move downward, and the driving tooth pattern 26 on the side of the driving strip 21 is meshed with the linkage tooth pattern 24 on the outer ring of the cleaning ring 23.

[0062] (3) Motion conversion: The linear motion of the driving strip 21 is converted into the rotational motion of the cleaning ring 23 through the tooth pattern meshing, so that the cleaning ring 23 rotates axially around the pin body 16.

[0063] During the rotation process, the scraping plate 25 performs spiral scraping on the surface of the pin body 16 to remove the oxide layer.

[0064] (4) Reset action: When the female end 13 is pulled out of the male end hole, the return spring 28 returns to the natural extended state, pushing the transmission rod 18 to reset. During the reset process of the transmission rod 18, the driving strip moves linearly in the reverse direction again, driving the cleaning ring 23 to rotate in the opposite direction, and scraping the oxide layer on the pin body 16 of the pulled-out pin hole 17 again until the transmission rod 18 completes the reset and the cleaning ring 23 stops rotating.

[0065] The linkage structure in this embodiment realizes mechanical automatic trigger cleaning, effectively solves the oxidation and corrosion problems of photovoltaic communication connectors, has the advantages of simple structure, high reliability, and low maintenance cost, and significantly improves the communication stability of the photovoltaic system.

[0066] The toothed drive between the drive rod 18 and the cleaning ring 23 used in this embodiment can be processed by a device for processing 10-mm-class micro drive gear sets in the prior art.

[0067] In this embodiment, as Figure 1 and Figures 9-11 shown, the communication rod body includes a housing 1, a mounting plate 3 detachably and sealingly mounted on the mounting groove opened on the housing 1, a communication circuit board 8 with one end disposed on the mounting plate 3 and the other end extending into the mounting groove, a connecting pipe 5 fixedly disposed on the side of the mounting plate 3 facing away from the housing 1 (a limiting ring 11 fixedly disposed at one end of the connecting pipe 5 away from the mounting plate 3 and rotatably connected to a connecting ring 6), and a connecting ring 6 rotatably disposed on the connecting pipe 5. A fixing post 7 is provided on the photovoltaic inverter, and the fixing post 7 is threadedly connected through the inner ring of the connecting ring 6; a male terminal 12 and a female terminal 13 are correspondingly provided at the position of the mounting plate 3 inside the connecting pipe 5 and at the end of the fixing post 7 away from the photovoltaic inverter; the communication circuit board 8 is connected to the male terminal 12 or the female terminal 13 disposed on the mounting plate 3, and the male terminal 12 or the female terminal 13 disposed on the photovoltaic inverter is connected to a communication connection board disposed inside the photovoltaic inverter. When the communication rod body is mounted on the photovoltaic inverter and the connecting ring 6 is rotated to be threadedly connected to the fixing post 7, the male terminal 12 of the connecting pipe automatically and precisely stacks with the female terminal 13 on the fixing post, simultaneously completing mechanical fixation and electrical connection, improving the installation and maintenance efficiency of the communication equipment in the photovoltaic power station.

[0068] Wherein, a sealing ring 9 is fixedly disposed on the groove wall at the opening position of the mounting groove, and when the mounting plate 3 is mounted on the housing 1, the end face of the sealing disk 10 disposed on the mounting plate 3 is in sealing fit with the sealing ring 9.

[0069] The mounting plate 3 is disposed on the housing 1 through a mounting member. The mounting member includes two positioning rods 4 symmetrically and vertically disposed on the end face of the mounting plate 3 facing away from the connecting pipe 5, two clamping blocks 14 fixedly disposed on the opposite side faces of the positioning rods 4, and a clamping ring 2 fixedly sleeved on the end of the housing 1 and having a clamping opening 15 on the end face. The two positioning rods 4 are inserted into the clamping opening 15; when the positioning rods 4 are completely inserted into the clamping opening 15, the clamping blocks 14 form a clamping fit with the clamping ring 2. When the communication rod body is mounted, the positioning rods 4 are aligned with the clamping opening 15 and pushed in, and the clamping blocks 14 are elastically deformed under pressure; when the positioning rods 4 are completely inserted, the clamping blocks 14 rebound and snap into the end face of the clamping ring 2 to form a mechanical interlock. When the communication rod body needs to be disassembled, only the bottoms of the two positioning rods 4 need to be pressed close to each other, at this time driving the clamping blocks 14 to move to the opening position of the clamping opening 15 respectively, and the clamping blocks 14 can be controlled to pass through the clamping opening 15 to realize the disassembly of the communication rod body.

[0070] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification are only preferred examples of the present invention, which are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic site communication stick, comprising a communication stick body and a connecting mechanism connecting the communication stick body and a photovoltaic inverter, characterized in that: The connection mechanism comprises a male terminal (12) mounted on the end of a communication stick body or a photovoltaic inverter, a female terminal (13) correspondingly mounted on the end of the photovoltaic inverter or the communication stick body, and a first cleaning component arranged in a pin hole (17) for cleaning a macroscopic oxide layer on the surface of the pin body (16); The male end (12) is provided with a male end hole, and the connecting end of the female end (13) is detachably inserted into the male end hole; the pin body (16) in the male end hole is correspondingly inserted into the pin hole (17) of the female end (13); when the pin body (16) is inserted, the first cleaning component moves in a spiral along the surface of the pin body (16) to remove the oxide layer.

2. A photovoltaic site communication stick according to claim 1, characterized in that: The connection mechanism also includes a plurality of cleaning brushes (30) arranged in a circumferential array in the pin hole (17) and distributed axially around the pin body (16), and a vibration unit arranged in the pin hole (17) and driving the cleaning brush (30) to vibrate at a high frequency. When the pin body (16) is inserted, the cleaning brush (30) performs secondary cleaning on the surface of the pin body (16) after being treated by the first cleaning component. The vibration unit controls the cleaning brush (30) to apply radial high-frequency vibration to the surface of the pin body (16) to collaboratively remove the macroscopic oxide layer on the surface of the pin body (16) and the oxide deposits in the microscopic pores.

3. A photovoltaic site communication stick according to claim 2, characterized in that: The cleaning brush (30) is a nanofiber brush.

4. A photovoltaic station communication stick according to any one of claims 1 to 3, characterized in that: The first cleaning component comprises a plurality of scrapers (25) arranged in a circular array in the pin hole (17) and distributed axially around the pin body (16), and a linkage member provided on the female end (13) and driving the plurality of scrapers (25) to rotate axially around the pin body (16); when the pin body (16) is inserted into the pin hole (17), the linkage member synchronously drives the plurality of scrapers (25) to rotate so as to scrape off an oxide layer on the surface of the pin body (16).

5. A photovoltaic site communication stick according to claim 4, characterized in that: The scraper (25) is in the form of an elongated strip, with its length direction arranged along the vertical direction, and an angle of 0° to 30° is formed between the length direction of the scraper (25) and the axis of the pin body (16).

6. A photovoltaic site communication stick according to claim 4, characterized in that: The scraper (25) is in the form of a long curved structure, and the opposing surfaces of the plurality of scrapers (25) form a guide curved surface that matches the profile of the end of the insertion end of the pin body (16); an elastic connection structure is provided between the guide curved surface and the connection end of each scraper (25), so that the scraper (25) maintains elastic contact with the surface of the pin body (16) during the cleaning process.

7. The photovoltaic site communication stick according to claim 4, characterized in that: The linkage member comprises a cleaning ring (23) coaxially sleeved on the outer surface of the pin body (16) and rotatably inserted into the pin hole (17), a transmission rod (18) slidingly inserted into the end of the female end (13) in a direction parallel to the direction in which the pin body (16) is inserted into the pin hole (17), and a linkage structure arranged inside the female end (13) and used for converting the axial linear motion of the transmission rod (18) into the rotational motion of the cleaning ring (23), wherein a plurality of scrapers (25) are evenly arranged on the inner ring of the cleaning ring (23) in the circumferential direction, and the working surface of each scraper (25) is kept in contact with the surface of the pin body (16).

8. The photovoltaic site communication stick according to claim 7, characterized in that: The linkage structure comprises a driving bar (21) arranged in a vertical direction and having its top fixedly connected to the bottom of a transmission rod (18), a telescopic rod (27) arranged in a vertical direction below the driving bar (21) and having its two ends respectively connected to the end of the driving bar (21) and the inner wall of a female end (13), and a return spring (28) movably sleeved on the body of the telescopic rod (27) and having its two ends respectively connected to the two ends of the telescopic rod (27), wherein when the return spring (28) is in a normally extended state, the top of the transmission rod (18) is located above the female end (13); the driving bar (21) is meshed with the linkage tooth pattern (24) provided on the outer ring of the cleaning ring (23) through the driving tooth pattern (26) provided on the side; When the female end (13) is inserted into the male end hole, the bottom wall of the male end hole presses the transmission rod (18) to slide into the female end (13), and the cleaning ring (23) is driven to rotate around the axial direction through the meshing action of the driving tooth pattern (26) and the linkage tooth pattern (24).

9. The photovoltaic site communication stick according to claim 1, characterized in that: The communication stick body comprises a housing (1), a mounting plate (3) detachably and sealably mounted on a mounting groove provided in the housing (1), a communication circuit board (8) having one end mounted on the mounting plate (3) and the other end extending into the mounting groove, a connecting pipe (5) fixedly mounted on the side of the mounting plate (3) facing away from the housing (1), and a connecting ring (6) rotatably mounted on the connecting pipe (5); a fixing column (7) is mounted on the photovoltaic inverter, and the fixing column (7) is threadedly connected and penetrated into the inner ring of the connecting ring (6); a male terminal (12) and a female terminal (13) are correspondingly mounted on the mounting plate (3) located in the connecting pipe (5) and on the end of the fixing column (7) away from the photovoltaic inverter; and the communication circuit board (8) is connected to the male terminal (12) or the female terminal (13) mounted on the mounting plate (3).

10. The photovoltaic site communication stick according to claim 9, characterized in that: The mounting plate (3) is mounted on the housing (1) via a mounting member, the mounting member comprising two positioning rods (4) symmetrically and vertically arranged on the end surface of the mounting plate (3) facing away from the connecting pipe (5), two clamping blocks (14) fixedly arranged on the opposite sides of the positioning rods (4), and a clamping ring (2) fixedly sleeved on the end of the housing (1) and having a clamping opening (15) on the end surface, the two positioning rods (4) being inserted into the clamping opening (15); When the positioning rod (4) is fully inserted into the bayonet (15), the clamping block (14) and the clamping ring (2) form a clamping fit.

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