A spray cleaning system for thin-film solar cells

Abstract

The utility model relates to the field of thin-film solar cell processing equipment, and provides a thin-film solar cell spray cleaning system, including a roller conveyor line, a spraying device, and a cleaning device. The roller conveyor line is composed of a plurality of conveyor rollers, and a partition is provided between adjacent conveyor rollers to separate the conveyor rollers into upper and lower halves; the cleaning device includes a spray pipe arranged one-to-one with the conveyor rollers, and a plurality of nozzles arranged on the spray pipe; the spray pipe is connected to an external cleaning liquid source; and the nozzle is used to spray the cleaning liquid onto the lower half of the conveyor roller. The system can clean the roller conveyor line while spraying the atomized solution on the light absorption layer, thereby always keeping the roller conveyor line clean, preventing the atomized solution from contaminating the positive side of the thin-film solar cell, and improving the efficiency of the process. At the same time, the partition can block the sprayed cleaning liquid, thereby preventing the cleaning work from affecting the normal spraying.

Description

Technical Field

[0001] The utility model relates to the field of thin-film solar cell processing equipment, in particular to a thin-film solar cell spray cleaning system. Background Art

[0002] Solar cells are devices that convert sunlight into electrical energy, and their development history can be traced back to the 19th century. With the development of science and technology, solar cell technology has been continuously optimized, and many types of solar cells have emerged, such as silicon-based solar cells and cadmium selenium solar cells. As an emerging solar cell technology, cadmium telluride solar cell technology has great application potential in photovoltaic power generation systems due to its high efficiency and stability. Cadmium telluride solar cells can not only be widely used in household photovoltaic power generation systems and commercial photovoltaic projects, but also in aerospace, military and communications.

[0003] In the production process of cadmium telluride solar cells, a layer of cadmium chloride solution needs to be sprayed on the thin film layer on the upper surface to improve the efficiency of the cell. However, the cadmium chloride solution will affect the positive side of the lower surface of the cadmium telluride solar cell, resulting in a decrease in the photoelectric conversion efficiency. Therefore, how to prevent the cadmium chloride solution from being contaminated on the positive side of the cadmium telluride solar cell becomes a key point. The existing technology mainly uses a fan filter system to suck the atomized cadmium chloride solution, but this method cannot completely prevent the cadmium chloride solution from being contaminated on the positive side of the cadmium telluride solar cell, because a large amount of cadmium chloride solution will remain on the conveyor belt during spraying, causing the positive side of the next workpiece to be contaminated.

[0004] CN113571599A discloses a cadmium telluride thin film solar cell, a preparation method and an activation treatment device. The activation treatment device of the patent includes: a spray chamber, the spray chamber includes a space surrounded by a plurality of baffles; a spray assembly, located in the spray chamber, the spray assembly includes two groups of reciprocating staggered atomizing nozzles; a transmission assembly, located below the spray chamber, for carrying the substrate to be activated and driving the substrate to move; a fan, the fan is connected to the lower part of the spray chamber; a wind knife, connected to the fan, the wind knife is arranged at the entrance and / or the exit of the spray chamber, the activation treatment device also includes a cleaning assembly, the cleaning assembly is located in the spray chamber and above the atomizing nozzle, the cleaning assembly includes a plurality of cleaning nozzles, the cleaning nozzles are connected to a cleaning liquid source, the transmission assembly includes a plurality of transmission rollers, and the transmission rollers are not arranged below the spraying area, and the atomizing nozzle is provided with an automatic scraper. Combined with the drawings in its specification, it can be seen that in order to avoid the problem that the transmission roller on the spraying area is contaminated with magnesium chloride solution and thus pollutes the positive side of the thin-film solar cell, the scheme does not set the transmission roller below the spraying area, and installs air vents, air knives, fans and other parts in the spraying chamber to form an external circulation from top to bottom, so that the sprayed mist liquid moves downward with the negative pressure, and the atomizing nozzle, spraying chamber and transmission assembly are automatically cleaned by a cleaning nozzle arranged above the atomizing nozzle.

[0005] However, the above solution still cannot completely avoid the problem of contaminating the positive side of the thin-film solar cell, because the mist liquid will be sprayed on the light absorption layer in an umbrella shape in the spraying area, and then collide and disperse with the airflow. Even through negative pressure adsorption, this movement trend cannot be restricted. This causes a small amount of mist liquid to escape from the spraying area and contaminate the transmission roller, thereby contaminating the positive side of the thin-film solar cell.

[0006] At the same time, since the cleaning nozzle is located above the conveyor roller, after cleaning, a large amount of water and water mist will adhere to the spraying area. During spraying, some water mist will be entrained to affect the concentration of the spraying liquid, thereby causing a decrease in the spraying quality.

[0007] Based on this, the technical problem solved in this case is: how to further solve the problem of atomized solution contaminating the positive side of thin-film solar cells, and the problem of cleaning the roller leading to a decrease in spraying quality. Utility Model Content

[0008] In order to solve the above technical problems, the utility model provides a thin-film solar cell spray cleaning system. The system can clean the roller conveyor line while spraying the atomized solution on the light absorption layer, thereby always keeping the roller conveyor line clean. It can prevent the atomized solution from contaminating the positive side of the thin-film solar cell and improve the efficiency of the process. At the same time, the partition can block the sprayed cleaning liquid, thereby preventing the cleaning work from affecting the normal progress of the spraying.

[0009] The technical solution of the utility model is:

[0010] A thin-film solar cell spray cleaning system comprises a roller conveyor line, a spraying device, and a cleaning device, wherein the spraying device is arranged above the roller conveyor line and is used for spraying an atomized solution; the cleaning device is arranged below the roller conveyor line, wherein the roller conveyor line is composed of a plurality of conveyor rollers and a partition is provided between adjacent conveyor rollers to separate the conveyor rollers into upper and lower halves; the cleaning device comprises a spray pipe arranged one-to-one corresponding to the conveyor rollers and a plurality of nozzles provided on the spray pipe; the spray pipe is connected to an external cleaning liquid source; and the spray direction of the nozzle is directly facing the lower half of the conveyor roller.

[0011] In the above-mentioned thin-film solar cell spray cleaning system, the roller conveyor line is sequentially divided into an inlet area, a spraying area, and an outlet area along the conveying direction; the conveying rollers in the inlet area, the spraying area, and the outlet area operate independently; and the spraying device is arranged in the spraying area.

[0012] In the above-mentioned thin-film solar cell spray cleaning system, the nozzle is arranged at the front side of the conveying direction of the conveying roller; the spraying direction of the nozzle is inclined with respect to the conveying surface of the roller conveying line.

[0013] In the above-mentioned thin-film solar cell spray cleaning system, the angle between the spraying direction of the nozzle and the conveying surface of the roller conveyor line is 15° to 60°.

[0014] In the above-mentioned thin-film solar cell spray cleaning system, the spray pipe is provided with a control valve for controlling the on / off and flow rate of the external cleaning liquid source.

[0015] In the above-mentioned thin-film solar cell spray cleaning system, the thin-film solar cell spray cleaning system also includes a blowing device for removing residual water droplets on the conveying roller; the blowing device includes an air duct arranged one-to-one corresponding to the conveying rollers, and a plurality of air nozzles arranged on the air duct; the air duct is connected to an external fan; the blowing direction of the air nozzle is facing the lower half of the conveying roller; the air nozzle is arranged on the rear side of the conveying direction of the conveying roller.

[0016] In the above-mentioned thin-film solar cell spray cleaning system, the thin-film solar cell spray cleaning system further comprises a water storage tank for collecting cleaning liquid, and the water storage tank is connected to an external water treatment system.

[0017] In the above-mentioned thin-film solar cell spray cleaning system, the roller conveyor line, the spray device, and the cleaning device are all arranged in a closed chamber.

[0018] One of the above technical solutions of the utility model has at least one of the following advantages or beneficial effects:

[0019] The utility model cleans each conveying roller of the roller conveying line respectively through spray pipes and nozzles arranged in one-to-one correspondence with the conveying rollers, so as to always keep the roller conveying line clean, and partitions are arranged between each conveying roller, so as to divide the conveying roller into an upper half and a lower half, and the spraying direction of the spray pipe is directly facing the lower half of the conveying roller, which can effectively avoid the influence of the spray on the spraying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a working schematic diagram of Example 1 of the utility model.

[0021] The numbers in the figures are:

[0022] Roller conveyor line 1; conveying roller 101; partition 102; spraying device 2; cleaning device 3; spray pipe 31; nozzle 32; blowing device 4; air duct 41; air nozzle 42; water storage tank 5; closed chamber a; sheet entry area b; spraying area c; sheet exit area d. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example 1

[0025] See also Figure 1A thin-film solar cell spray cleaning system includes a roller conveyor line 1, a spraying device 2, and a cleaning device 3. The spraying device 2 is arranged above the roller conveyor line 1 and is used to spray an atomized solution; the cleaning device 3 is arranged below the roller conveyor line 1, and the roller conveyor line 1 is composed of 9 conveyor rollers 101, and a partition 102 is provided between adjacent conveyor rollers 101 to separate the conveyor rollers 101 into upper and lower halves; the cleaning device 3 includes a spray pipe 31 arranged one-to-one corresponding to the conveyor rollers 101, and a plurality of nozzles 32 arranged on the spray pipe 31; the spray pipe 31 is connected to an external cleaning liquid source; the spray direction of the nozzle 32 is directly facing the lower half of the conveyor roller 101.

[0026] As a preferred embodiment of the present invention, the roller conveyor line 1 is sequentially divided into an entry area b, a spraying area c, and an exit area d along the conveying direction; in the present embodiment, specifically, the entry area b, the spraying area c, and the exit area d are respectively distinguished by three continuous conveying rollers 101; the conveying rollers 101 of the entry area b, the spraying area c, and the exit area d operate independently; the spraying device 2 is arranged in the spraying area c.

[0027] Under the above-mentioned preference, the working process of this embodiment is as follows: the thin-film solar cell is input into the system from the outside, and then is transmitted to the spraying area c through the sheet input area b, the conveying roller 101 of the spraying area c stops and the spraying device 2 starts spraying, after the spraying is completed, the conveying roller 101 of the sheet output area d idles and the cleaning device 3 is started, and the cleaning liquid is sprayed out from the nozzle 32 through the spray pipe 31 to clean the conveying roller 101 of the sheet output area d, after the cleaning is completed, the thin-film solar cell is transmitted from the spraying area c to the sheet output area d, and then output to the outside of the system, and at the same time, the conveying rollers 101 of the sheet input area b and the spraying area c should also be cleaned once after the spraying is completed or before the next thin-film solar cell is input.

[0028] Preferably, since the partition 102 designed in this embodiment can block the sprayed cleaning liquid, thereby preventing the cleaning work from affecting the normal progress of spraying, the cleaning work and spraying work in this embodiment can be carried out simultaneously, which can obviously improve the processing efficiency.

[0029] In this embodiment, in order to quickly clean the solution that may be contaminated on the conveying roller 101, the nozzle 32 is arranged at the front side of the conveying direction of the conveying roller 101. Under this design, when the upper part of the conveying roller 101 is contaminated, the contaminated part will quickly enter the cleaning range of the nozzle 32 during its rotation and be completely cleaned in time, further preventing the residual solution from contaminating the positive side of the thin-film solar cell.

[0030] As a preferred embodiment of the present invention, the angle between the spray direction of the nozzle 32 and the conveying surface of the roller conveyor line is 45°. In practical applications, this design can prevent the cleaning liquid from splashing into the upper part through the gap between the partition plate 102 and the conveying roller 101.

[0031] In practical applications, a control valve for controlling the on / off and flow rate of the external cleaning liquid source is provided on the spray pipe 31. It should be noted that since the control valve is a common technical means used by those skilled in the art, it is not supplemented in this embodiment and is not shown in the figure.

[0032] In this embodiment, preferably, the thin-film solar cell spray cleaning system also includes a blowing device 4 for removing residual water droplets on the conveying roller 101; the blowing device 4 includes an air duct 41 arranged one-to-one corresponding to the conveying roller 101, and a plurality of air nozzles 42 arranged on the air duct 41; the air duct 41 is connected to an external fan; the blowing direction of the air nozzle 42 is facing the lower half of the conveying roller 101; the air nozzle 42 is arranged on the rear side of the conveying direction of the conveying roller 101.

[0033] Under the above-mentioned preferred embodiment, after the cleaning device 3 completes the cleaning, the blowing device 4 blows the water droplets on the conveying roller 101 as dry as possible through the air duct 41 and the air nozzle 42 to avoid secondary contamination caused by the atomized solution being incorporated into the water droplets.

[0034] In this embodiment, it is further preferred that the thin-film solar cell spray cleaning system further comprises a water storage tank 5 for collecting cleaning liquid, and the water storage tank 5 is connected to an external water treatment system. Since the sprayed atomized solution is harmful to the human body, in order to prevent the cleaning liquid from polluting the environment, and to recycle the cleaning liquid and reduce costs, this embodiment collects the used cleaning liquid through the water storage tank 5, and then removes the heavy metals in the atomized solution through the external water treatment system for recycling.

[0035] In this embodiment, since the sprayed atomized solution is harmful to the human body, in order to prevent the atomized solution from entering the atmosphere of the working environment, the roller conveyor line 1, the spraying device 2, and the cleaning device 3 are all arranged in a closed chamber a.

[0036] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A spray cleaning system for thin-film solar cells, comprising a roller conveyor line, a spray device, and a cleaning device, wherein the spray device is arranged above the roller conveyor line and is used to spray an atomized solution; the cleaning device is arranged below the roller conveyor line, characterized in that: The roller conveyor line is composed of a plurality of conveyor rollers and a partition is provided between adjacent conveyor rollers to separate the conveyor rollers into upper and lower halves; the cleaning device includes a spray pipe arranged one-to-one corresponding to the conveyor rollers and a plurality of nozzles provided on the spray pipe; the spray pipe is connected to an external cleaning liquid source; the nozzle is used to spray the cleaning liquid onto the lower half of the conveyor roller.

2. The thin-film solar cell spray cleaning system according to claim 1, characterized in that: The roller conveyor line is divided into a sheet entry area, a spraying area, and a sheet exit area in sequence along the conveying direction; the conveying rollers in the sheet entry area, the spraying area, and the sheet exit area operate independently; and the spraying device is arranged in the spraying area.

3. The thin-film solar cell spray cleaning system according to claim 1, characterized in that: The nozzle is arranged at the front side of the conveying direction of the conveying roller; the spraying direction of the nozzle is inclined with respect to the conveying surface of the roller conveying line.

4. The thin-film solar cell spray cleaning system according to claim 3, characterized in that: The angle between the spraying direction of the nozzle and the conveying surface of the roller conveyor line is 15° to 60°.

5. The thin-film solar cell spray cleaning system according to claim 1, characterized in that: The spray pipe is provided with a control valve for controlling the on / off and flow rate of an external cleaning liquid source.

6. The thin-film solar cell spray cleaning system according to claim 3, characterized in that: The thin-film solar cell spray cleaning system also includes a blowing device for removing residual water droplets on the conveying roller; the blowing device includes an air duct arranged one-to-one corresponding to the conveying rollers and a plurality of air nozzles arranged on the air duct; the air duct is connected to an external fan; the blowing direction of the air nozzle is facing the lower half of the conveying roller; the air nozzle is arranged on the rear side of the conveying direction of the conveying roller.

7. The thin-film solar cell spray cleaning system according to claim 1, characterized in that: The thin-film solar cell spray cleaning system also includes a water storage tank for collecting cleaning liquid, and the water storage tank is connected to an external water treatment system.

8. The thin-film solar cell spray cleaning system according to claim 1, characterized in that: The roller conveyor line, the spraying device and the cleaning device are all arranged in a closed chamber.

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