Carbon-carbon rod for photovoltaic coating

Abstract

The utility model provides a carbon-carbon rod for photovoltaic film coating, and belongs to the technical field of PECVD (Plasma Enhanced Chemical Vapor Deposition) boat film coating. The carbon-carbon rod for photovoltaic coating comprises a rod body, the threaded heads are formed at the two ends of the rod body and are matched with the nuts for use, so that the use requirement of locking the boat piece is met; meanwhile, the rod body is made of a carbon fiber material, the fracture resistance and compression resistance are better, the problem of fracture caused by the influence of factors such as internal stress is not prone to occurring, the service life is prolonged, in addition, the insulating layer is arranged on the outer surface of the rod body, the electric insulation isolation requirement can be met through the insulating layer, and the use requirement for installation on a boat body is met; the problem that an existing graphite rod is peeled after being used can be solved, the service life is prolonged, the problem that frequent replacement is needed due to the short service life is solved, the machining efficiency is improved, the machining cost is reduced, PECVD coating machining of solar cells is facilitated, and rapid development of the industry is facilitated.

Description

Technical Field

[0001] This utility model relates to the field of PECVD boat coating technology, specifically to a carbon rod for photovoltaic coating. Background Technology

[0002] PECVD coating is a key process in the manufacture of solar cells, and the graphite boat used in it has become a key tool in solar cell manufacturing. Therefore, improving the performance of the graphite boat is the key to improving the manufacturing efficiency and reducing the cost of solar cells.

[0003] Currently, commercially available graphite boats typically include boat sheets, spacers, locking points, ceramic tubes, ceramic rods, and graphite rods. Several boat sheets are arranged in parallel intervals. Alternating boat sheets are connected to the same pole via spacers and graphite rods. Additionally, ceramic rods are threaded through several boat sheets, and ceramic tubes are placed between adjacent boat sheets. The ceramic rods and tubes improve the stability of the boat sheet installation and provide insulation. For example, patent CN102610701B discloses a graphite boat that is easy to assemble and disassemble. It discloses multiple graphite boat sheets with multiple circular through holes. Each graphite boat sheet is fixedly connected to form a boat body via ceramic rods passing through the circular through holes. In this case, ceramic tubes are fitted onto the ceramic rods between adjacent graphite boat sheets, and the two ends of each ceramic rod are fixed to the two outermost graphite boat sheets by graphite nuts. In use, the solar silicon wafer to be coated is placed into the formed boat and fixed by the locking points on the boat, and then the whole thing is sent into the furnace tube. The solar cell is obtained by chemical gas vapor deposition on the surface of the solar silicon wafer. Although the above-mentioned graphite boat can meet the PECVD coating requirements of solar cells, due to the acid washing and high temperature environment required in the process, and the influence of the internal stress of the ceramic rod itself, the ceramic rod is very prone to peeling or breakage. As a result, the service life of the ceramic rod is mostly less than three months. That is, the service life of the ceramic rod used in the existing graphite boat is short and needs to be replaced frequently. This affects the processing efficiency and increases the processing cost, which is not conducive to the PECVD coating process of solar cells. Summary of the Invention

[0004] To address the aforementioned problems in existing technologies, this invention aims to provide a carbon-carbon rod for photovoltaic coating. The rod body is made of carbon fiber and has an insulating layer on its exterior. This not only meets insulation requirements and prevents peeling during use, but the carbon fiber rod also possesses excellent bending and compressive strength, effectively preventing breakage during use and extending its service life. This avoids the need for frequent replacements, which would affect assembly efficiency and increase processing costs, thus facilitating the PECVD coating process of solar cells.

[0005] The specific technical solution is as follows:

[0006] A carbon rod for photovoltaic coating, used to connect and lock several boat pieces, is characterized by including: a rod body, threaded heads at both ends of the rod body, the rod body being made of carbon fiber material, and an insulating layer being provided on the outer surface of the rod body.

[0007] The aforementioned carbon rod for photovoltaic coating has an insulating layer that is a yttrium oxide coating.

[0008] The aforementioned carbon rod for photovoltaic coating has a threaded head and a rod body that are integrated into one piece.

[0009] The aforementioned carbon rod for photovoltaic coating has an outer cylindrical smooth surface on its outer wall.

[0010] The aforementioned carbon rod for photovoltaic coating has a plurality of limiting slots spaced apart on the rod body along its axial direction, and a boat piece is fixed in each limiting slot.

[0011] In the aforementioned carbon rod for photovoltaic coating, the limiting groove is an annular groove that surrounds the rod body.

[0012] In the aforementioned carbon rod for photovoltaic coating, the spacing between two adjacent limiting slots is consistent along the axial direction of the rod.

[0013] The aforementioned carbon rod for photovoltaic coating has a graphite nut or a carbon fiber nut threaded onto its threaded head.

[0014] The positive effects of the above technical solution are:

[0015] The aforementioned carbon-carbon rod for photovoltaic coating is made of carbon fiber with threaded ends. An insulating layer is also added to the outside of the rod, providing insulation and preventing peeling. This meets the requirements for supporting and locking the boat. Furthermore, the carbon fiber rod exhibits excellent bending and compressive strength, effectively eliminating fractures caused by internal stress, extending its service life, and avoiding the problems of low processing efficiency and high processing costs due to frequent replacements. This facilitates the PECVD coating process of solar cells and promotes industry development. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an embodiment of a carbon rod for photovoltaic coating according to this utility model;

[0017] Figure 2 This is a cross-sectional view of a carbon rod for photovoltaic coating according to the present invention;

[0018] Figure 3 This invention relates to another structure of a carbon rod for photovoltaic coating.

[0019] In the attached diagram: 1. Rod body; 2. Threaded head; 3. Insulation layer; 4. Limiting slot. Detailed Implementation

[0020] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 3 The technical solution provided by this utility model is described in detail, but the following content is not intended to limit this utility model.

[0021] Figure 1 This is a structural diagram of an embodiment of a carbon rod for photovoltaic coating according to this utility model; Figure 2 This is a cross-sectional view of a carbon rod for photovoltaic coating according to this utility model. Figure 1 and Figure 2 As shown, the carbon carbon rod for photovoltaic coating provided in this embodiment is used to connect and lock several boat pieces to form a boat body. In this embodiment, the carbon carbon rod for photovoltaic coating includes a rod body 1, and each fixed boat piece has a mounting hole, with the rod body 1 passing through the mounting hole of the boat piece.

[0022] Specifically, threaded heads 2 are provided at both ends of the rod 1, extending axially along the rod 1 to facilitate subsequent connection and locking of the boat sheet via the rod 1. Furthermore, the rod 1 is made of carbon fiber, meaning it has a carbon-carbon rod structure, giving it good resistance to bending and compression, thus preventing breakage due to internal stress and extending its service life, reducing operating costs, and avoiding the low processing efficiency caused by frequent replacements. Additionally, an insulating layer 3 is provided on the outer surface of the rod 1, isolating it from the outside environment and preventing it from conducting electricity. This meets the requirements for mounting and securing the boat sheet, while also preventing peeling during use, further extending its service life, reducing operating costs, and avoiding the low processing efficiency caused by frequent replacements. This benefits the PECVD coating process of solar cells and promotes industry development.

[0023] More specifically, the insulating layer 3 set on the outer surface of the rod 1 is a yttrium oxide coating, which has excellent insulation properties and stable chemical and physical properties, meeting the requirements for use in the environment of graphite boat coating and having a longer service life.

[0024] More specifically, the threaded heads 2 located at both ends of the rod 1 are an integral structure with the rod 1, that is, the rod 1 and the threaded heads 2 are a whole structure, which has better integrity and higher structural strength, so that the structure of the boat body formed after the boat piece is locked by the threaded heads 2 has better stability.

[0025] More specifically, the outer wall of rod 1 is a smooth cylindrical surface, which facilitates processing and simplifies the processing technology. It also makes it easier for rod 1 to pass through the mounting holes of the corresponding boat piece, which facilitates the assembly and disassembly of the boat and makes the structural design more reasonable.

[0026] More specifically, this embodiment also provides a structure in which a limiting slot 4 is provided on the outside of the rod 1. Figure 3 This is another structure of a carbon rod for photovoltaic coating according to this utility model. For example... Figure 3 As shown, several limiting slots 4 are provided on the rod body 1 at intervals along its axial direction. During installation, the rod body 1 is inserted into the mounting hole of the boat piece. At this time, a boat piece is locked in each limiting slot 4, that is, the hole wall of the mounting hole is locked into the corresponding limiting slot 4. The boat pieces are spaced apart on the rod body 1 through the cooperation of the mounting hole and the limiting slot 4, and the boat pieces can maintain the stability of their position on the rod body 1, realizing the isolation between adjacent boat pieces. There is no need to set up a separate structure such as a ceramic tube for isolation, making disassembly and assembly more convenient and the structural design more reasonable.

[0027] More specifically, on the rod 1 with the limiting groove 4, each limiting groove 4 is an annular groove that surrounds the rod 1, covering the entire circumference of the rod 1. This allows the wall of the mounting hole to engage with the limiting groove 4 from any direction when the rod 1 is inserted into the mounting hole of the boat piece. This eliminates the need to distinguish directions when installing and fitting the rod 1 onto the boat piece, thus facilitating the connection between the rod 1 and the boat piece. It is worth noting that when fitting the boat piece and the limiting groove 4, it is only necessary to move the rod 1 to one side, allowing one side of the mounting hole wall to engage with one side of the limiting groove 4, making assembly and disassembly more convenient.

[0028] More specifically, on the rod 1 with the limiting slot 4, and along the axial direction of the rod 1, the spacing between two adjacent limiting slots 4 is consistent. This ensures that when the boat piece is positioned by the limiting slot 4, the spacing between two adjacent boat pieces is consistent, eliminating the need for further adjustment. This further facilitates the assembly and disassembly of the boat body, making the structural design more reasonable.

[0029] More specifically, the threaded heads 2 at both ends of the rod 1 are threaded with nuts made of graphite or carbon fiber. The boat piece is pressed together by the cooperation of the threaded heads 2 and the nuts. That is, the cooperation of the nuts and the threaded heads 2 forms a limiting and pressing structure at both ends of the rod 1, thereby achieving a stable connection between the rod 1 and the boat piece, locking the boat piece, and forming a stable boat body.

[0030] The carbon-carbon rod for photovoltaic coating provided in this embodiment includes a rod body 1. Threaded heads 2 are formed at both ends of the rod body 1 and used in conjunction with nuts to meet the requirements for locking the boat. Simultaneously, the rod body 1 is made of carbon fiber, which has better bending and compressive strength, making it less prone to breakage due to internal stress and other factors, thus extending its service life. Furthermore, an insulating layer 3 is provided on the outer surface of the rod body 1. This insulating layer 3 not only meets the requirements for electrical insulation and isolation, and the requirements for installation on the boat, but also prevents the peeling problem that occurs with existing ceramic rods after use, further extending its service life and preventing frequent replacements due to short service life. This improves processing efficiency, reduces processing costs, facilitates PECVD coating processing of solar cells, and promotes the rapid development of the industry.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A carbon rod for photovoltaic coating, used to connect and lock together a plurality of boat pieces, characterized in that, It includes: a rod body, with threaded ends at both ends, the rod body being made of carbon fiber, and an insulating layer on the outer surface of the rod body.

2. The carbon rod for photovoltaic coating according to claim 1, characterized in that, The insulating layer is a yttrium oxide coating.

3. The carbon rod for photovoltaic coating according to claim 1, characterized in that, The threaded head and the rod body are an integral structure.

4. The carbon rod for photovoltaic coating according to claim 1, characterized in that, The outer wall of the rod is a smooth cylindrical surface.

5. The carbon-carbon rod for photovoltaic coating according to any one of claims 1-4, characterized in that, The rod body is provided with a plurality of limiting slots spaced apart along its axial direction, and each of the limiting slots is fitted with a boat piece.

6. The carbon rod for photovoltaic coating according to claim 5, characterized in that, The limiting groove is an annular groove that surrounds the rod body.

7. The carbon rod for photovoltaic coating according to claim 5, characterized in that, Along the axial direction of the rod, the spacing between two adjacent limiting slots is consistent.

8. The carbon rod for photovoltaic coating according to claim 1, characterized in that, The threaded head is threaded with a nut made of graphite or carbon fiber.

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