Air knife drying device for coating substrates

Abstract

The application discloses a kind of air knife drying device for coating substrate, air knife drying device includes: base and air knife component, base is suitable for carrying the coating substrate to be dried, coating substrate has first to be dried region and second to be dried region, in the drying direction of coating substrate, second to be dried region is located downstream of first to be dried region;Air knife component includes: air knife, first flow guide and second flow guide, first flow guide is used to guide the airflow blown by air knife to gather in first to be dried region;Second flow guide is used to guide the airflow blown by air knife away from second to be dried region, to prevent second to be dried region from being dried in advance.The air knife drying device for coating substrate according to the embodiment of the application can ensure the consistency of the drying of the coating substrate, and has good flexibility and strong practicability.

Description

Technical Field

[0001] This invention relates to the field of perovskite solar cell film formation technology, and in particular to an air knife drying device for coating substrates. Background Technology

[0002] As an emerging third-generation solar cell, perovskite solar cells have seen their efficiency increase year by year since 2009. Their wide availability of raw materials, low cost, and simple fabrication have attracted numerous researchers and investors. However, many challenges remain to be overcome in achieving large-area production. The most critical and difficult challenge lies in how to efficiently and reproducibly fabricate complete, large-area perovskite films.

[0003] After perovskite solution coating, a thin liquid film is formed on the glass substrate. After drying, a smooth and flat perovskite film layer is obtained, and the quality of the perovskite film layer has a crucial impact on the overall efficiency of the cell. Currently, the mainstream technologies for drying perovskite liquid films mainly include vacuum drying and air knife drying. Compared to vacuum drying, air knife drying has advantages such as lower cost, convenient installation, and strong operability. However, when using air knife drying, the backward airflow is difficult to control. If the backward airflow comes into contact with the perovskite liquid film prematurely, it will cause the perovskite liquid film to crystallize prematurely. However, due to the small air volume, the crystallization is incomplete, resulting in a large difference in the uniformity of crystal grain size, affecting the overall crystallization quality of the liquid film, and ultimately affecting the efficiency and lifespan of the perovskite solar cell. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide an air knife drying device for coating substrates, which can ensure the consistency of drying of the coating substrate, and is flexible and practical.

[0005] An air knife drying apparatus for a coated substrate according to an embodiment of the present invention includes: a base and an air knife assembly. The base is adapted to support a coated substrate to be dried. The coated substrate has a first region to be dried and a second region to be dried. In the drying direction of the coated substrate, the second region to be dried is located downstream of the first region to be dried. The air knife assembly includes: an air knife, a first guide member, and a second guide member. The first guide member is used to guide the airflow blown out by the air knife to converge in the first region to be dried. The second guide member is used to guide the airflow blown out by the air knife away from the second region to be dried, so as to prevent the second region to be dried prematurely.

[0006] According to the embodiments of the present invention, the air knife drying device for coating substrate can effectively prevent the airflow from flowing toward the second drying area by providing a second guide member for guiding the airflow. This makes it difficult for the airflow dissipated by the air knife to act on the perovskite slurry in the second drying area, thereby making it difficult for the perovskite slurry to crystallize prematurely and thus ensuring the consistency of the perovskite film to a certain extent.

[0007] In addition, the air knife drying apparatus for coating substrates according to embodiments of the present invention may also have the following additional technical features:

[0008] In some embodiments of the present invention, the air knife assembly further includes a first driving member, the second guide member being located above the second area to be dried, the first driving member being used to drive the second guide member to move toward the second area to be dried, or the first driving member being used to drive the second guide member to move away from the second area to be dried.

[0009] In some embodiments of the present invention, the lower surface of the second flow guide is parallel to the upper surface of the coating substrate.

[0010] In some embodiments of the present invention, the second flow guide has a flow guide space, the flow guide space has a first opening and a second opening, the airflow to the second area to be dried enters the flow guide space through the first opening and then flows out of the flow guide space through the second opening, the second opening being located on the side of the flow guide space away from the coating substrate.

[0011] In some embodiments of the present invention, the second opening includes a plurality of vent holes.

[0012] In some embodiments of the present invention, multiple rows of vent holes are spaced apart along the flow direction of the airflow, and each row of vent holes is configured as a vent hole row. Multiple guide plates are also provided in the flow guiding space, and the multiple guide plates correspond one-to-one with the multiple rows of vent holes. Each guide plate is used to guide the airflow toward the corresponding row of vent holes. The flow guiding space has opposing first and second walls. The vent holes are located on the first wall. One end of the guide plate is connected to the second wall, and the other end extends toward the first wall and is spaced apart from the first wall. In the flow direction of the airflow, the distance between the guide plate and the first wall gradually decreases.

[0013] In some embodiments of the present invention, the air knife includes an air knife shell. In the drying direction of the coated substrate, the first guide plate and the second guide plate are respectively located on both sides of the air knife shell. The first guide plate abuts against the air knife shell. The second guide plate has a first position abutting against the air knife shell and a second position for reducing the airflow blown out by the air knife from flowing to the second area to be dried. The second guide plate has an end plate. When the second guide plate is in the first position, the end plate is in contact with the outer surface of the air knife shell.

[0014] In some embodiments of the present invention, the first flow guide is a plate parallel to the upper surface of the base.

[0015] In some embodiments of the present invention, a plurality of reinforcing ribs are provided on the plate surface of the first guide member.

[0016] In some embodiments of the present invention, the air knife drying device for coating substrate further includes: a second driving member, wherein the first guide member is located above the first area to be dried, and the second driving member is used to drive the first guide member to move toward the coating substrate, or the second driving member is used to drive the first guide member to move away from the coating substrate.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the structure of an air knife drying device according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the second guide member of the air knife drying device according to an embodiment of the present invention.

[0021] Figure 3 This is a cross-sectional view of the second guide member of the air knife drying device according to an embodiment of the present invention.

[0022] Figure 4 This is a cross-sectional view of the second guide member of the air knife drying device according to an embodiment of the present invention from another angle.

[0023] Figure 5 This is a schematic diagram of the structure of the first guide member of the air knife drying device according to an embodiment of the present invention.

[0024] Figure label:

[0025] Air knife drying device 100

[0026] Coating substrate 10, first area to be dried 101, second area to be dried 102

[0027] Abutment 1.

[0028] Air knife assembly 2, second guide component 21, guide space 211, first opening 212, second opening 213, vent 214, guide plate 215, air knife 22, first wall plate 221, second wall plate 222, first guide component 23, reinforcing rib 231. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] The following is for reference. Figures 1-5 An air knife drying apparatus 100 for coating substrate 10 according to an embodiment of the present invention is described.

[0033] like Figures 1-5As shown, an air knife drying apparatus 100 for a coating substrate 10 according to an embodiment of the present invention includes a base 1 and an air knife assembly 2. The base 1 is adapted to support the coating substrate 10 to be dried. The coating substrate 10 has a first drying region 101 and a second drying region 102. In the drying direction of the coating substrate 10, the second drying region 102 is located downstream of the first drying region 101. Downstream indicates that the first drying region 101 is the region to be dried first, and the second drying region 102 is the region to be dried later. The air knife assembly 2 includes an air knife 22, a first guide member 23, and a second guide member 21. The air knife 22 is used to blow out airflow. The first guide member 23 is used to guide the airflow blown out by the air knife 22 to converge in the first drying region 101. The second guide member 21 is used to prevent the airflow blown out by the air knife 22 from flowing to the second drying region 102, so as to prevent the second drying region 102 from being dried prematurely.

[0034] In this application, the coating substrate 10 can be movable while the air knife drying device 100 is stationary, or the coating substrate 10 can be stationary while the air knife drying device 100 is movable; this application does not impose any limitations. In one example, after the coating substrate 10 is placed on the base 1, the coating substrate 10 can move along... Figure 1 The movement is from back to front. Here, the direction from back to front is the drying direction of the coating substrate 10. It should be noted that since the coating substrate 10 can always be in a state of movement in the back-to-front direction, the first area to be dried 101 and the second area to be dried 102 in this application do not refer to two specific areas of the coating substrate 10. Rather, the first area to be dried 101 refers to the part of the coating substrate 10 that is being dried, and the second area to be dried 102 refers to the part of the coating substrate 10 that is about to be dried. The reason for referring to it as the first area to be dried 101 and the second area to be dried 102 is only for the convenience of describing this application, and not for limiting this application. That is, each area of ​​the coating substrate 10 that is being dried is called the first area to be dried 101, and each area of ​​the coating substrate 10 that is about to be dried is called the second area to be dried 102.

[0035] Further with Figure 1 Taking the first drying area 101 and the second drying area 102 in the two dashed boxes as an example, the first drying area 101 and the second drying area 102 are connected in the front-to-back direction. The coating substrate 10 moves continuously from back to front. Therefore, the coating substrate 10 is constantly being dried, and the coating substrate 10 is about to be dried.

[0036] Optionally, the air knife assembly 2 includes an air knife 22, a first guide 23, and a second guide 21. The air knife 22 is used to blow out airflow, the first guide 23 is used to guide the airflow blown out by the air knife 22 to converge in the first area to be dried 101, and the second guide 21 is used to guide the airflow blown out by the air knife 22 away from the second area to be dried 102, so as to prevent the second area to be dried 102 from being dried prematurely.

[0037] refer to Figure 1 As shown in a specific example, the base 1 carries the coating substrate 10 to be dried and is adapted to transport the coating substrate 10 in a back-to-forward direction. The coating substrate 10 to be dried in this application is illustrated using a glass substrate and perovskite coated on the glass substrate as an example. Of course, it is understood that the coating substrate 10 to be dried in this application can also be other structures, such as display panels, photovoltaic silicon panels, chip wafers, etc., which are not limited here.

[0038] In this application, the large-area coating substrate 10 can be, for example, a coating substrate 10 with an area greater than 300mm*300mm. For example, in this disclosure, the area of ​​the large-area coating substrate 10 can be 0.4m*0.4m, 1m*1m, 1m*2m, 2m*2m, 5m*5m, or 10m*10m, etc. Furthermore, it should be noted that the air knife drying device 100 of this disclosure can also be applied to coating substrates 10 with smaller coating areas. When the air knife drying device 100 of this disclosure is used on coating substrates 10 with smaller coating areas, it also helps to improve coating accuracy, that is, to improve the consistency of the film thickness on the coating substrate 10.

[0039] The air knife assembly 2 can be set above the base 1. The air knife assembly 2 can provide a high-pressure, high-impact airflow sheet to blow away the liquid film. Here, the liquid film refers to the undried perovskite slurry coated on the glass substrate. In addition, for ease of description, the film layer can also refer to the dried perovskite slurry.

[0040] Optionally, the air outlet of the air knife 22 can be tilted at a predetermined angle toward the first guide member 23 to deliver airflow to the substrate. Referring to the accompanying drawings, the air outlet of the air knife 22 is tilted forward at a predetermined angle. In some examples, the air outlet delivers airflow to the coating substrate 10 supported on the substrate 1 in a manner where the airflow direction is forward and at a predetermined angle to the coating substrate 10 supported on the substrate 1. The coating substrate 10 can be placed horizontally on the substrate 1, and the air outlet can be forward and have a predetermined angle with the coating substrate 10. In this case, after the airflow output from the air outlet flows to the coating substrate 10, it can also be reflected by the coating substrate 10 toward the first guide member 23 in a manner similar to light "reflection," and then reflected again toward the coating substrate 10 in a manner similar to light "reflection." In this way, the coating substrate 10 can be repeatedly impacted by the airflow through the first guide member 23, which can improve the drying efficiency of the liquid film. Of course, it is understandable that the airflow from the outlet of the air knife 22 can also be directed in a direction perpendicular to the coating substrate 10, or in other directions, and this application does not impose any restrictions.

[0041] In some examples, the air outlet of the air knife 22 is tilted forward at a predetermined angle of 15 to 75 degrees. In other words, the predetermined angle between the air outlet and the coating substrate 10 can be 15 to 75 degrees. For example, the predetermined angle can be 15 degrees, 30 degrees, 45 degrees, 60 degrees, or 75 degrees. In this case, the airflow exits the air outlet at a predetermined angle and faces forward, which facilitates the airflow to flow in a predetermined direction.

[0042] Furthermore, Figure 1 In the example shown, the air knife assembly 2 creates an airflow environment capable of drying the perovskite slurry between the first guide member 23 and the coating substrate 10. However, due to the fluidity and divergence of the airflow, some of the airflow will flow backward. This backward-flowing airflow acts on the perovskite slurry in the second drying area 102, which can easily cause the perovskite slurry in the second drying area 102 to crystallize prematurely, thus affecting the consistency of the perovskite film. By setting the second guide member 21, when the diffused airflow flows backward, the distance between the second guide member 21 and the coating substrate 10 is small, making it difficult for the airflow to flow into the space between the second guide member 21 and the coating substrate 10. This hinders the airflow from flowing into the space between the second guide member 21 and the coating substrate 10. Thus, the backward-flowing airflow is less likely to act on the perovskite slurry in the second drying area 102, preventing premature crystallization of the perovskite slurry in the second drying area 102, thereby ensuring the consistency of the perovskite film to a certain extent.

[0043] According to an embodiment of the present invention, the air knife drying device 100 for coating substrate 10 can effectively prevent airflow from flowing toward the second drying area 102 by providing a second guide member 21 for guiding airflow. This makes it difficult for the airflow escaping from the air knife 22 to act on the perovskite slurry in the second drying area 102, thereby making it difficult for the perovskite slurry to crystallize prematurely, thus ensuring the consistency of the perovskite film to a certain extent.

[0044] In some embodiments of the present invention, such as Figure 1 As shown, the air knife assembly 2 also includes a first driving member and a second guide member 21 located above the second drying area 102. The first driving member is used to drive the second guide member 21 to move toward the second drying area 102, or the first driving member is used to drive the second guide member 21 to move away from the second drying area 102.

[0045] In other words, by enabling the second guide member 21 to move in the vertical direction, the distance between the second guide member 21 and the coating substrate 10 can be adjusted. This allows for several advantages. First, the distance between the second guide member 21 and the coating substrate 10 can be adjusted according to the actual airflow velocity of the air knife 22. It is understood that different airflow velocities require the second guide member 21 to block different amounts of airflow towards the second drying area 102. Therefore, the distance between the second guide member 21 and the coating substrate 10 can be adjusted according to different airflow velocities of the air knife 22, thus reducing the difficulty of adjusting the position of the second guide member 21 and providing good flexibility. Second, when the thickness of the coating substrate 10 changes, the first drive member can effectively adjust the distance between the first guide member 23 and the coating substrate 10 according to the thickness of the coating substrate 10, thereby enhancing the practicality of the air knife drying device 100 of this application.

[0046] According to an embodiment of the present invention, the air knife drying apparatus 100 for coating substrate 10, by providing a second guide member 21 to obstruct airflow, can effectively prevent airflow from flowing into the space between the second guide member 21 and the coating substrate 10. Thus, the airflow flowing backward is less likely to act on the perovskite slurry, thereby preventing premature crystallization of the perovskite slurry and ensuring the consistency of the perovskite film to a certain extent. By providing a first driving member to drive the second guide member 21 up and down, the distance between the second guide member 21 and the coating substrate 10 can be adjusted according to the thickness of the coating substrate 10, thereby making the air knife drying apparatus 100 of this application highly flexible and practical.

[0047] In some embodiments of the present invention, such as Figure 1As shown, the lower surface of the second guide member 21 is parallel to the upper surface of the coating substrate 10. In other words, the lower surface of the second guide member 21 is parallel to the upper surface of the perovskite slurry. With this configuration, when the airflow enters the space between the second guide member 21 and the coating substrate 10, the airflow can interfere in the space between the second guide member 21 and the coating substrate 10. Furthermore, the space between the second guide member 21 and the coating substrate 10 is relatively long in the front-back direction, so the airflow can be gradually and effectively weakened. This can further impede the airflow entering the space between the second guide member 21 and the coating substrate 10, and further prevent the second drying area 102 from being dried prematurely.

[0048] Optionally, such as Figures 2-4 As shown, the second flow guide 21 has a flow guide space 211, which has a first opening 212 and a second opening 213. Airflow to the second drying area 102 enters the flow guide space 211 through the first opening 212 and then exits through the second opening 213. The second opening 213 is located on the side of the flow guide space 211 opposite to the coating substrate 10. (Reference) Figures 1-4 As shown in the example, when the airflow flows backward, it can enter the guiding space 211 of the second guide 21 through the first opening 212, and then flow upward through the second opening 213 from the guiding space 211. In this way, the flow direction of the airflow flowing backward can be guided better, and the dissipated airflow can be better contained to avoid the airflow affecting the working environment.

[0049] Furthermore, when a slurry feeding mechanism is located behind the second guide member 21, the second guide member 21 directs the airflow upwards, thus preventing the airflow from affecting the feeding mechanism. That is, it prevents fluctuations in the liquid curtain formed between the coating blade of the feeding mechanism and the glass substrate, thereby avoiding inconsistent thickness of the slurry layers formed before and after.

[0050] In some examples, the airflow exiting from the second opening 213 can also be diverted to other locations by structures such as pipes, thereby further reducing the impact of the airflow on the working environment.

[0051] In some embodiments of the present invention, such as Figures 2-4As shown, the second opening 213 includes multiple vents 214. That is, the upper wall of the flow guiding space 211 is constructed with multiple vents 214 to form a mesh structure. The mesh can not only prevent wind and dust and ensure the environment of the flow guiding space 211, but also the multiple vents can effectively constrict the airflow. In other words, when the airflow enters the flow guiding space 211 and flows out through the vents 214, the mesh structure can effectively consume the airflow velocity, so that the airflow exits the flow guiding space 211 in a state similar to no wind, thereby effectively reducing the impact of airflow on the working environment.

[0052] In some embodiments of the present invention, multiple vent holes 214 are arranged in multiple rows along the flow direction of the airflow, and the multiple vent holes 214 in each row are configured as a vent hole row. Multiple guide plates 215 are also provided in the flow guiding space 211, and the multiple guide plates 215 correspond one-to-one with the multiple vent hole rows. Each guide plate 215 is used to guide the airflow toward the corresponding vent hole row. The flow guiding space 211 has a first wall and a second wall opposite to each other. The vent holes 214 are located on the first wall. One end of the guide plate 215 is connected to the second wall, and the other end extends toward the first wall and is spaced apart from the first wall. In the flow direction of the airflow, the distance between the guide plate 215 and the first wall gradually decreases.

[0053] refer to Figures 2-4 As shown, the lower end of each guide plate 215 is connected to the lower wall of the guide space 211, and the upper end extends obliquely towards the upper wall of the guide space 211, with the distance between the guide plate 215 and the upper wall of the guide space 211 gradually decreasing. That is, when the airflow enters the guide space 211 through the first opening 212, part of the airflow can be guided by the first guide plate 215 to flow towards the first row of vents 214, while another part of the airflow passes through the space between the first guide plate 215 and the upper wall of the guide space 211 and continues to flow into the guide space 211. Then, a part of it is guided by the second guide plate 215 to flow towards the second row of vents 214, and another part of it continues to pass through the space between the second guide plate 215 and the upper wall of the guide space 211 and continues to flow into the guide space 211. This process is repeated, which not only effectively guides the airflow entering the guide space 211 but also effectively reduces the airflow velocity.

[0054] In some embodiments of the present invention, such as Figure 1As shown, the air knife 22 includes an air knife shell. In the drying direction of the coated substrate 10, a first guide plate 215 and a second guide plate 215 are respectively located on both sides of the air knife shell. The first guide plate 215 abuts against the air knife shell. The second guide plate 215 has a first position abutting against the air knife shell and a second position for reducing the airflow blown out by the air knife 22 from flowing to the second drying area 102. The second guide plate 215 has an end plate. When the second guide plate 215 is in the first position, the end plate is in contact with the outer surface of the air knife shell.

[0055] like Figures 1-2 In one specific example, the air knife 22 includes an air knife shell with a first wall plate 221 facing the second guide member 21. The end face of the second guide member 21 facing the air knife 22 is parallel to the first wall plate 221. At least a portion of the end face is provided with a first opening 212. That is, the end face can be entirely constructed as the first opening 212, i.e., without an end face, the end of the second guide member 21 facing the air duct is a fully open scoop shape. In another example, the first opening 212 can also be formed only on a portion of the end face. The size of the first opening 212 can be determined according to the actual working conditions and is not limited here. Making the end face parallel to the first wall plate 221 can better shorten the distance between the air knife shell and the second guide member 21, thereby better receiving the airflow returning towards the rear end. It can also make it less likely for the second guide member 21 to interfere with the air knife shell during its up and down movement, increasing the movement space of the second guide member 21 in the up and down direction, thereby making the second guide member 21 more flexible.

[0056] In some embodiments of the present invention, such as Figure 1 and Figure 5 As shown, the first guide element 23 is a plate parallel to the upper surface of the base 1. That is, the first guide element 23 has a simple structure, which can reduce manufacturing costs. The first guide element 23 is parallel to the upper surface of the base 1, that is, the lower surface of the first guide element 23 is parallel to the upper surface of the coating substrate 10. When the airflow with a predetermined angle enters the space between the first guide element 23 and the coating substrate 10, the direction of the repeatedly "reflected" airflow and the number of reflections can be easily controlled, which is beneficial to drying the coating substrate 10 and ensuring the consistency of the coating substrate 10.

[0057] Optionally, such as Figure 1 and Figure 5 As shown, the first guide member 23 has multiple reinforcing ribs 231 on its plate surface. By setting multiple reinforcing ribs 231, the structural strength of the first guide member 23 can be improved, making the first guide member 23 less prone to deformation under the impact of airflow, thus enabling stable guidance of airflow.

[0058] In some embodiments of the present invention, such as Figure 1 and Figure 5 As shown, the first guide member 23 abuts against the air knife 22. That is, the front-facing wall of the air knife shell is the second wall plate 222. The first guide member 23 abuts against the second wall plate 222. Thus, the airflow output from the air knife 22 is completely covered in the space between the first guide member 23 and the coating substrate 10, which can better prevent the airflow from escaping and ensure that the energy of the airflow is not lost. In this way, the coating substrate 10 can be dried better, which can improve the drying efficiency of the coating substrate 10 to a certain extent.

[0059] In some embodiments of the present invention, the air knife drying device 100 for coating substrate 10 further includes a second driving member, and the first guide member 23 is located above the first drying area 101. The second driving member is used to drive the first guide member 23 to move toward the coating substrate 10, or the second driving member is used to drive the first guide member 23 to move away from the coating substrate 10.

[0060] like Figure 1 and Figure 5 In a specific example shown, the second driving component is used to adjust the position of the first guide component 23 in the vertical direction, thereby adjusting the distance between the first guide component 23 and the substrate, and thus adjusting the impact frequency of the airflow toward the coating substrate 10. For example, when the airflow enters the space between the first guide component 23 and the coating substrate 10 at a predetermined angle, once the flow angle of the airflow toward the coating substrate 10 is determined, the impact frequency of the airflow toward the coating substrate 10 is closely related to the distance between the first guide component 23 and the coating substrate 10. The smaller the distance between the first guide component 23 and the coating substrate 10, the higher the impact frequency; conversely, the larger the distance between the first guide component 23 and the coating substrate 10, the lower the impact frequency. It should be noted that there is an optimal impact frequency for drying perovskite slurries of different thicknesses. This application can adjust the impact frequency according to perovskite slurries of different thicknesses, so that perovskite slurries of different thicknesses can achieve a good drying effect and improve the drying efficiency of perovskite slurries.

[0061] In addition, the position of the first guide member 23 in the vertical direction can be adjusted according to the air volume or the tilt angle of the airflow, and there are no restrictions on this.

[0062] Other configurations and operations of the air knife drying apparatus 100 for coating substrate 10 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0063] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air knife drying device for coating a substrate, characterized in that, The application relates to a drying device for drying a coating substrate, comprising: a base station adapted to carry a coating substrate to be dried, the coating substrate having a first region to be dried and a second region to be dried, the second region to be dried being located downstream of the first region to be dried in a drying direction of the coating substrate; and a wind knife assembly comprising: a wind knife; a first flow guide for guiding the air flow blown by the wind knife to converge at the first region to be dried; and a second flow guide having an end face at one end of the wind knife, the end face being capable of guiding the air flow blown by the wind knife in a backflow direction to guide the air flow blown by the wind knife away from the second region to be dried to prevent the second region to be dried from being dried prematurely. The wind knife assembly further comprises a first driving member, the second flow guide is located above the second region to be dried, and the first driving member is used to drive the second flow guide to move in a direction towards the second region to be dried, or the first driving member is used to drive the second flow guide to move in a direction away from the second region to be dried.

2. The air knife drying apparatus for coating a substrate according to claim 1, wherein, A lower surface of the second flow guide is parallel to an upper surface of the coating substrate.

3. The air knife drying apparatus for coating a substrate according to claim 2, wherein, The second flow guide has a flow guide space therein, the flow guide space has a first opening and a second opening, the air flow flowing towards the second region to be dried enters the flow guide space through the first opening and then flows out of the flow guide space through the second opening, and the second opening is located on a side of the flow guide space away from the coating substrate.

4. The air knife drying apparatus for coating a substrate according to claim 1, wherein The second opening comprises a plurality of air permeable holes.

5. The air knife drying apparatus for coating a substrate according to claim 4, wherein The plurality of air permeable holes are arranged in a plurality of rows along a flow direction of the air flow, the air permeable holes in each row are configured as an air permeable hole row, and a plurality of flow guide plates are further arranged in the flow guide space, the plurality of flow guide plates correspond to the plurality of air permeable hole rows one by one, and each flow guide plate is used for guiding the flow towards the corresponding air permeable hole row, wherein 6. The air knife drying apparatus for coating a substrate according to claim 5, wherein the flow guide space has opposite first and second wall surfaces, the air permeable holes are located on the first wall surface, one end of the flow guide plate is connected to the second wall surface, the other end of the flow guide plate extends towards the first wall surface and is spaced apart from the first wall surface, and the distance between the flow guide plate and the first wall surface gradually decreases in the flow direction of the air flow. In the drying direction of the coating substrate, the first flow guide and the second flow guide are located on two sides of the wind knife respectively, and the second flow guide is adapted to move up and down to adjust the distance between the second flow guide and the base station.

7. The air knife drying apparatus for coating a substrate of claim 1, wherein, The first flow guide is a plate body parallel to the upper surface of the base station.

8. The air knife drying apparatus for coating a substrate of claim 1, wherein, A plurality of reinforcing ribs are arranged on the plate surface of the first flow guide.

9. Air knife drying device for coating substrates according to claim 8, characterized in that The application further relates to a drying device for drying a coating substrate, comprising:

10. The air knife drying apparatus for coating a substrate of claim 1, wherein, a second driving member, the first flow guide is located above the first region to be dried, and the second driving member is used to drive the first flow guide to move in a direction towards the coating substrate, or the second driving member is used to drive the first flow guide to move in a direction away from the coating substrate. ​

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