Photovoltaic silicon wafer drying system

Abstract

This application relates to a photovoltaic silicon wafer drying system, applied in the field of photovoltaic cleaning. It includes a housing and a blower. The housing has a drying trough, and a guide cover is hinged to the opening of the housing. An air inlet pipe and an air outlet pipe are connected to the housing. A basket is placed inside the drying trough between the air inlet and outlet pipes. The air inlet of the blower is connected to the air outlet pipe, and the air outlet of the blower is connected to the air inlet pipe. The technical advantages of this application are: when drying the photovoltaic silicon wafers on the basket, the blower is activated to blow air through the air inlet pipe onto the basket in the drying trough. The guide cover guides the airflow, creating a circulating flow field during the drying cycle. This uniform circulating flow field allows for more stable and efficient evaporation of moisture on the surface of the photovoltaic silicon wafers, accelerating the overall drying process and improving drying efficiency and quality.

Description

Technical Field

[0001] This application relates to the field of photovoltaic cleaning technology, and in particular to a photovoltaic silicon wafer drying system. Background Technology

[0002] Photovoltaic silicon wafers are thin-film semiconductor materials formed by a series of processes, such as ingot casting, crystal pulling, and cutting, from high-purity polycrystalline silicon. They occupy a key position in the photovoltaic industry.

[0003] In the fabrication process of photovoltaic silicon wafers, the wafers, which are mounted on baskets, need to be dried. Related technologies employ a blower to draw in external air, which is then directly blown onto an open box at the top via a heater. The baskets are placed inside the drying chamber, and the airflow from the inlet is fixed to the baskets to dry the photovoltaic silicon wafers.

[0004] The above-mentioned method of drying photovoltaic silicon wafers by directly blowing the blower onto the basket results in insufficient uniformity of the airflow circulation inside the drying tank. This can easily lead to localized concentration of hot air within the drying tank. The photovoltaic silicon wafers that come into contact with a large amount of hot air will dry quickly, while the silicon wafers that come into contact with less hot air cannot be dried in time. As a result, some areas will still have residual moisture, making it difficult to dry the photovoltaic silicon wafers of the basket dryer completely and reducing the overall drying efficiency of the photovoltaic silicon wafers. Summary of the Invention

[0005] To address the problem of insufficient uniformity of airflow within the drying tank when photovoltaic silicon wafers are dried by directly blowing hot air onto the baskets, which can lead to localized hot air concentration, the photovoltaic silicon wafers exposed to a large amount of hot air dry quickly, while those exposed to less hot air fail to dry in time, resulting in residual moisture in some areas and hindering the overall drying efficiency of the basket-type photovoltaic silicon wafers, this application provides a photovoltaic silicon wafer drying system with the following technical solution: It includes a housing and a blowing device. A drying tank is provided inside the housing, and a guide cover is hinged to the opening of the housing. An air inlet pipe and an air outlet pipe are connected to the housing. The baskets are placed inside the drying tank and positioned between the air inlet pipe and the air outlet pipe. The air inlet end of the blowing device is connected to the air outlet pipe, and the air outlet end of the blowing device is connected to the air inlet pipe.

[0006] In one specific implementation scheme, a return air hole is provided on the side of the housing facing away from the guide cover plate, and a guide shell covering the return air hole is provided on the housing. A return air pipe is connected to the guide shell, and several inclined guide surfaces are provided on the guide shell between the return air hole and the return air pipe. The airflow in the guide shell converges to the return air pipe along the inclined guide surfaces.

[0007] In one specific implementation, the flow guide shell is provided with a partition, and the partition has several openings. The partition is located between the flower basket and the return air pipe.

[0008] In one specific implementation, the box is provided with a support frame, the flower basket is placed on the support frame, and the support frame and the partition form a cavity that communicates with the return air duct.

[0009] In one specific implementation scheme, the box is provided with an air inlet baffle and an air outlet baffle. The air inlet baffle is located between the flower basket and the air outlet end of the air inlet pipe, and the air outlet baffle is located between the flower basket and the air inlet end of the air outlet pipe. The air inlet baffle and the air outlet baffle are respectively provided with a number of air guide holes.

[0010] In one specific implementation, a fresh air duct is connected between the air outlet duct and the air inlet of the blower, and the fresh air duct is connected to the external space.

[0011] In one specific implementation scheme, the air inlet of the fresh air duct is connected to an installation pipe, the installation pipe is provided with a first filter, and the air inlet duct is connected to the air outlet of the blower through a second filter.

[0012] In one specific implementation, the air inlet pipe is connected to an exhaust pipe, and the exhaust pipe is equipped with a control valve for controlling the opening and closing of the exhaust pipe. The exhaust pipe is located between the blower and the second filter.

[0013] In one specific implementation, the air inlet duct is provided with a heater for heating the airflow inside the air inlet duct.

[0014] In one specific implementation, the heater is located between the exhaust duct and the second filter.

[0015] In summary, this application has the following beneficial technical effects: when it is necessary to dry the photovoltaic silicon wafers on the flower basket, the blowing equipment is started to blow air into the flower basket in the drying tank through the air inlet pipe. The guide cover plate guides the airflow, and the airflow forms a circulating flow field during the drying cycle. The uniform circulating flow field can make the moisture on the surface of the photovoltaic silicon wafer evaporate more stably and efficiently, accelerate the overall drying process, and improve drying efficiency and drying quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0017] Figure 2 This is a schematic diagram used to illustrate the airflow direction in the embodiments of this application.

[0018] Reference numerals: 1. Box body; 2. Blowing equipment; 3. Drying tank; 4. Guide cover plate; 5. Air inlet pipe; 6. Air outlet pipe; 7. Guide shell; 8. Return air pipe; 9. Inclined guide surface; 10. Partition plate; 11. Support frame; 12. Chamber; 13. Air inlet partition; 14. Air outlet partition; 15. Air guide hole; 16. Fresh air pipe; 17. Second filter; 18. Exhaust pipe; 19. Heater; 20. First inclined plate; 21. Second inclined plate. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0020] This application discloses a photovoltaic silicon wafer drying system.

[0021] Reference Figure 1 and Figure 2 The photovoltaic silicon wafer drying system includes a housing 1 and a blower 2. In this embodiment, the blower 2 is a hot air blower. The main body of the housing 1 is made of polyvinylidene fluoride (PVDF). PVDF has good high-temperature resistance and structural rigidity. Its long-term operating temperature can reach about 150°C, and it can withstand higher temperatures for short periods. It can withstand the high temperatures generated during the drying process without softening or deformation, ensuring that the housing 1 can maintain a stable shape and structure in a high-temperature environment and maintain the normal operation of the drying system. A drying trough 3 is provided inside the box body 1. A guide cover 4 is hinged to the opening of the box body 1. The guide cover 4 includes a first inclined plate 20 and a second inclined plate 21. The inclination direction of the first inclined plate 20 and the second inclined plate 21 makes the guide cover 4 have an arched structure. An air inlet pipe 5 and an air outlet pipe 6 are connected to the box body 1. The flower basket is placed in the drying trough 3 and is located between the air inlet pipe 5 and the air outlet pipe 6. In this embodiment, the drying of three flower baskets at one time is taken as an example. The air inlet end of the blower 2 is connected to the air outlet pipe 6, and the air outlet end of the blower 2 is connected to the air inlet pipe 5.

[0022] Therefore, when it is necessary to dry the photovoltaic silicon wafers on the flower basket, the blower 2 is started and blows air into the flower basket in the drying tank 3 through the air inlet pipe 5. The guide cover 4 guides the airflow and forms a circulating flow field during the drying cycle. The uniform circulating flow field can make the moisture on the surface of the photovoltaic silicon wafer evaporate more stably and efficiently, which speeds up the overall drying process and improves drying efficiency and drying quality.

[0023] Reference Figure 1 and Figure 2A fresh air duct 16 connects the air outlet duct 6 to the air inlet of the blower 2. The fresh air duct 16 is connected to the external space, and an installation pipe is connected to the air inlet of the fresh air duct 16. A first filter is installed inside the installation pipe. The air inlet duct 5 is connected to the air outlet of the blower 2 through a second filter 17. In this embodiment, the first filter and the second filter 17 are high-efficiency filters in the prior art. The high-efficiency filter has a filter screen inside, and the main body of the high-efficiency filter is made of high-temperature resistant polytetrafluoroethylene material. The fresh air duct 16 continuously injects fresh air from outside into the blower 2 after being filtered by the first filter. After being heated by the blower 2, it is further filtered by the second filter 17, which improves the cleanliness of the air injected into the housing 1. A heater 19 is installed on the air inlet duct 5 to heat the airflow in the air inlet duct 5. The heater 19 can be located between the second filter 17 and the housing 1, or it can be flexibly set between the second filter 17 and the blower 2 according to the actual situation on site. There is no limitation here. Preferably, in this embodiment, the heater 19 is located between the exhaust duct 18 and the second filter 17. The temperature of the air inside the tube is further increased by heater 19, thereby improving drying efficiency.

[0024] Reference Figure 1 and Figure 2 An exhaust pipe 18 is connected to the air inlet pipe 5. A control valve is installed on the exhaust pipe 18 to control its opening and closing. The exhaust pipe 18 is located between the blower 2 and the second filter 17. The operator can control the opening and closing of the exhaust pipe 18 through the control valve according to the actual situation on site. Normally, the exhaust pipe 18 is in a closed state. When it is necessary to further improve the air freshness in the drying system, the control valve is activated to open the exhaust pipe 18. Part of the air injected into the blower 2 through the fresh air pipe 16 flows into the housing 1 along the air inlet pipe 5, while the other part of the humid air is discharged through the exhaust pipe 18.

[0025] Reference Figure 1 and Figure 2 An air inlet baffle 13 and an air outlet baffle 14 are installed on the inner wall of the box body 1. The air inlet baffle 13 is located between the flower basket and the air outlet end of the air inlet pipe 5, and the air outlet baffle 14 is located between the flower basket and the air inlet end of the air outlet pipe 6. Several air guide holes 15 are opened on the air inlet baffle 13 and the air outlet baffle 14 respectively. In this embodiment, the air guide holes 15 are located on the top surface and the side surface of the air inlet baffle 13 and the air outlet baffle 14 respectively. The air inlet baffle 13 and the air outlet baffle 14 further enhance the structural rigidity of the box body 1. The air in the air inlet pipe 5 is injected into the box body 1 through the air guide holes 15 of the air inlet baffle 13 to blow air onto the flower basket, and then injected into the air outlet pipe 6 through the air guide holes 15 of the air outlet baffle 14.

[0026] Reference Figure 1 and Figure 2A support frame 11 is installed inside the box 1, and the flower basket is placed on the support frame 11. The support frame 11 and the partition 10 form a cavity 12 that communicates with the return air duct 8. Some gas is injected into the air outlet duct 6 through the cavity 12. The gas dries the bottom of the flower basket during the flow of gas in the cavity 12, which improves the overall drying efficiency of the flower basket.

[0027] Reference Figure 1 and Figure 2 The housing 1 has a return air hole on the side facing away from the guide cover 4. A guide shell 7 covering the return air hole is installed on the housing 1, and a return air duct 8 is connected to the guide shell 7. Several inclined guide surfaces 9 are provided on the guide shell 7 between the return air hole and the return air duct 8. The airflow in the guide shell 7 converges to the return air duct 8 along the inclined guide surfaces 9. The guide shell 7 guides the airflow into the return air duct 8 through the inclined guide surfaces 9. Since humid air is heavier, the humid air in the housing 1 can enter the guide shell 7 at the bottom of the housing 1 and then be discharged through the return air duct 8, further improving the dryness of the air in the housing 1. A baffle 10 is installed inside the guide shell 7. The baffle 10 has several perforations and is located between the baffle and the return air duct 8. The baffle 10 blocks large impurities or components, reducing the possibility of components accidentally falling off and blocking the return air duct 8.

[0028] The implementation principle of this application embodiment is as follows: When it is necessary to dry the photovoltaic silicon wafers on the flower basket, the blower 2 and heater 19 are started. Fresh air is drawn into the blower 2 through the fresh air duct 16, and then passes through the heater 19 and the second filter 17 to evenly send hot air into the box 1. The air in the air inlet duct 5 is injected into the box 1 through the air guide hole 15 of the air inlet partition 13 to blow air onto the flower basket. The guide cover 4 guides the air. The hot air is injected into the air outlet duct 6 through the air guide hole 15 of the air outlet partition 14. Thus, the airflow forms a hot air flow field from top to bottom and from right to left in the box 1, covering the entire area of ​​the flower basket and photovoltaic silicon wafers, drying the photovoltaic silicon wafers and the flower basket. Some of the drier hot air is reinjected into the blower 2 through the air outlet duct 6, and some of the more humid humid air enters the guide shell 7 at the bottom of the box 1, and after passing through the return air duct 8, it flows into the blower 2 through the air outlet duct 6 to achieve circulation. During the drying cycle, the airflow forms a circulating flow field. A uniform circulating flow field can make the moisture on the surface of the photovoltaic silicon wafer evaporate more stably and efficiently, which speeds up the overall drying process and improves drying efficiency and quality.

[0029] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A photovoltaic silicon wafer drying system, characterized by: The device includes a housing (1) and a blower (2). A drying trough (3) is provided inside the housing (1). A guide cover (4) is hinged to the opening of the housing (1). An air inlet pipe (5) and an air outlet pipe (6) are connected to the housing (1). The flower basket is placed in the drying trough (3) and located between the air inlet pipe (5) and the air outlet pipe (6). The air inlet end of the blower (2) is connected to the air outlet pipe (6), and the air outlet end of the blower (2) is connected to the air inlet pipe (5). The box (1) has a return air hole on the side away from the guide cover plate (4). The box (1) is provided with a guide shell (7) covering the return air hole. The guide shell (7) is connected to a return air pipe (8). The guide shell (7) is provided with several inclined guide surfaces (9) between the return air hole and the return air pipe (8). The airflow in the guide shell (7) converges to the return air pipe (8) along the inclined guide surfaces (9).

2. The photovoltaic silicon wafer drying system of claim 1, wherein: The flow guide shell (7) is provided with a partition (10), and the partition (10) has several slits. The partition (10) is located between the flower basket and the return air pipe (8).

3. The photovoltaic silicon wafer drying system of claim 2, wherein: The box (1) is provided with a support frame (11), and the flower basket is placed on the support frame (11). The support frame (11) and the partition (10) form a cavity (12) that communicates with the return air duct (8).

4. The photovoltaic silicon wafer drying system of claim 1, wherein: The box (1) is provided with an air inlet baffle (13) and an air outlet baffle (14). The air inlet baffle (13) is located between the flower basket and the air outlet end of the air inlet pipe (5). The air outlet baffle (14) is located between the flower basket and the air inlet end of the air outlet pipe (6). Several air guide holes (15) are opened on the air inlet baffle (13) and the air outlet baffle (14).

5. The photovoltaic silicon wafer drying system of claim 1, wherein: A fresh air duct (16) is connected between the air outlet duct (6) and the air inlet of the blower (2), and the fresh air duct (16) is connected to the external space.

6. The photovoltaic silicon wafer drying system of claim 5, wherein: The air inlet of the fresh air duct (16) is connected to an installation pipe, and a first filter is provided inside the installation pipe. The air inlet duct (5) is connected to the air outlet of the blower (2) through a second filter (17).

7. The photovoltaic silicon wafer drying system of claim 6, wherein: The air inlet pipe (5) is connected to the air outlet pipe (18), and the air outlet pipe (18) is equipped with a control valve to control the opening and closing of the air outlet pipe (18). The air outlet pipe (18) is located between the blower (2) and the second filter (17).

8. The photovoltaic silicon wafer drying system of claim 7, wherein: The air inlet pipe (5) is equipped with a heater (19) for heating the airflow inside the air inlet pipe (5).

9. The photovoltaic silicon wafer drying system of claim 8, wherein: The heater (19) is located between the exhaust pipe (18) and the second filter (17).

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