Air knife drying system

Abstract

The utility model discloses an air knife drying system which comprises an air knife, a dry gas supply device and a vortex tube. Air inlets are respectively formed in two opposite sides of the air knife; the dry gas supply device is used for supplying dry gas; one end of the vortex tube is connected with the dry gas supply device, and the vortex tube can receive dry gas supplied by the dry gas supply device and form hot gas flow; the other end of the vortex tube is connected with an air inlet of the air knife so as to supply hot air flow into the air knife; at least one vortex tube is used for supplying hot air flow to the air inlets in the two opposite sides of the air knife. The air knife drying system is used for improving the drying efficiency and reducing the operation cost of the air knife drying system.

Description

Technical Field

[0001] The utility model relates to the technical field of film drying, in particular to an air knife drying system. Background Art

[0002] As a new type of artificial synthetic material, perovskite has become a high-potential choice to replace crystalline silicon cells in the new generation of photovoltaic materials due to its excellent photoelectric conversion efficiency, low raw material cost, and high energy density. When preparing perovskite cells, perovskite slurry is first coated on a substrate to form a perovskite liquid film, and then the perovskite liquid film is dried to prepare a perovskite dry film.

[0003] There are currently two methods for drying perovskite liquid films: vacuum flash evaporation and air knife technology. Air knife technology includes cold air knife drying and hot air knife drying. When preparing perovskite dry films, the dry film efficiency and perovskite drying uniformity of the hot air knife are superior to those of the cold air knife drying. When the hot air knife is drying, the gas needs to be preheated in advance, and the heated gas is blown out through the hot air knife to dry the perovskite liquid film. In existing hot air knives, the heating source is generally electric heating. This heating method has a high operating cost and low efficiency. When using electric heating, it generally takes 1 - 2 minutes of preheating before hot air can be blown out to dry the perovskite liquid film. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an air knife drying system for improving the drying efficiency and reducing the operating cost of the air knife drying system.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] An air knife drying system, comprising:

[0007] An air knife with air inlets provided on opposite sides;

[0008] A drying gas supply device for supplying drying gas;

[0009] A vortex tube, one end of which is connected to the drying gas supply device. The vortex tube can receive the drying gas supplied by the drying gas supply device and form a hot air stream; the other end of the vortex tube is connected to the air inlet of the air knife to supply the hot air stream into the air knife;

[0010] Wherein, at least one of the vortex tubes is used to supply hot air streams to the air inlets on opposite sides of the air knife.

[0011] Preferably, at least two vortex tubes are provided. The two vortex tubes are distributed on opposite sides of the air knife, and each vortex tube is connected to one air inlet of the air knife and supplies a hot air stream.

[0012] Preferably, the dry gas supply device is connected to the vortex tube through a first connecting pipeline, and a pressure controller is arranged on the first connecting pipeline, and the pressure controller is used to control the gas pressure flowing into the vortex tube.

[0013] Preferably, the vortex tube is connected to the air inlet of the air knife through a second connecting pipeline, and a pressure controller is arranged on the second connecting pipeline, and the pressure controller is used to control the gas pressure flowing into the air knife.

[0014] Preferably, a cold gas collection device is further included. The vortex tube is provided with a hot end and a cold end. The hot air flow formed in the vortex tube flows to the air knife through the hot end, and the cold air flow formed in the vortex tube flows to the cold gas collection device through the cold end.

[0015] Preferably, a plurality of air inlets are arranged at the air inlet of the air knife. The plurality of air inlets include a first air inlet on one side of the air knife, a second air inlet on the other side of the air knife, and a third air inlet between the first air inlet and the second air inlet. One or more third air inlets are provided, and the first air inlet, the one or more third air inlets, and the second air inlet are evenly spaced along the length direction of the air knife.

[0016] Preferably, a heat insulation and heat preservation component is attached to the outer surface of the air knife. The heat insulation and heat preservation component is used to block the heat transfer between the inside of the air knife and the outside, and the heat insulation and heat preservation component is provided with an avoidance hole for avoiding the air inlet, and the vortex tube is connected to the air inlet through the avoidance hole.

[0017] Preferably, the heat insulation and heat preservation component includes a heat insulation layer, a heating layer, and a heat conduction layer arranged from outside to inside. The heating layer is used to generate a heat source, and the heat conduction layer is used to receive the heat source generated by the heating layer and transfer it to the outer surface of the air knife, and the heat insulation layer blocks the heat transfer with the outside.

[0018] Preferably, the heat insulation and heat preservation component further includes a temperature detection component, and the temperature detection component is arranged between the heat conduction layer and the outer surface of the air knife and is used to detect the temperature of the air knife.

[0019] Preferably, the heat insulation layer adopts an adiabatic foam layer, the heating layer is an electric heating wire heat source, the heat conduction layer is a heat conduction silicon wafer, and the temperature detection component is a thermocouple.

[0020] Compared with the prior art, the beneficial effects of the present utility model at least include:

[0021] By using a vortex tube as a heat source to supply hot air to the air knife, the energy consumption required to generate hot air can be effectively reduced, and the operating cost of the air knife drying system can be lowered; generally, the vortex tube can generate a uniform and stable hot air supply in only 2 - 5 seconds, with high efficiency, which can effectively improve the drying efficiency of the air knife drying system; the hot air flow generated by the vortex tube is produced after the vortex rectification of its own structure, so the hot air flow generated by the vortex tube is more uniform and reliable, which can enhance the drying effect of the air knife drying system. Brief Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the air knife drying system according to an embodiment of the present invention when two air inlets are provided;

[0023] Figure 2 is a schematic structural diagram of the air knife drying system according to an embodiment of the present invention when three air inlets are provided;

[0024] Figure 3 is a schematic structural diagram of the air knife and the heat insulation component according to an embodiment of the present invention.

[0025] In the figure: 1. Air knife; 11. Air inlet; 111. First air inlet; 112. Second air inlet; 113. Third air inlet; 2. Dry gas supply device; 3. Vortex tube; 31. First connecting pipeline; 311. Pressure controller; 32. Second connecting pipeline; 33. Hot end; 34. Cold end; 4. Cold air collection device; 5. Heat insulation component; 51. Heat insulation layer; 52. Heating layer; 53. Heat conduction layer; 54. Temperature detection element. Detailed Embodiments

[0026] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this invention will be more complete and comprehensive, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. Like reference numerals in the figures denote the same or similar structures, and thus their repeated description will be omitted.

[0027] In the present invention, the words expressing position and direction are described by taking the drawings as examples, but can be changed according to needs, and all the changes made are included in the protection scope of the present invention.

[0028] Referring to Figure 1 , the present invention provides an air knife drying system, which includes an air knife 1, a dry gas supply device 2, and a vortex tube 3, and may further include a cold air collection device 4.

[0029] The dry gas supply device 2 can be connected to the vortex tube 3 so that the dry gas supply device 2 can supply dry gas to the vortex tube 3. The dry gas supplied by the dry gas supply device 2 can specifically be CDA (clean dry air) or high-purity compressed nitrogen. Among them, the dry gas supply device 2 and the vortex tube 3 can be connected through a first connecting pipeline 31, and the dry gas supplied by the dry gas supply device 2 flows into the first connecting pipeline 31 and then flows into the vortex tube 3 through the first connecting pipeline 31. To facilitate the control of the gas pressure flowing into the vortex tube 3, a pressure controller 311 can be provided on the first connecting pipeline 31, and the pressure controller 311 can control the gas pressure flowing into the vortex tube 3.

[0030] The vortex tube 3 receives the dry gas supplied by the dry gas supply device 2 and can make the dry gas form a high-speed airflow and generate a vortex. The vortex tube 3 provides a hot airflow after vortex rectification through the forced flow of two fluid streams, namely the inner cold flow and the outer hot flow, after energy exchange. This hot airflow has a high temperature uniformity, and generally, the vortex tube 3 only needs 2 - 5 seconds to generate a uniform and stable hot airflow and supply it to the outside. The vortex tube 3 can be connected to the air knife 1, and the hot airflow generated by the vortex tube 3 can be supplied to the air knife 1 so that the air knife 1 can dry the target component through the hot airflow provided by the vortex tube 3, such as drying the perovskite liquid film into a dry film.

[0031] By using the vortex tube 3 as a heat source to supply hot airflow to the air knife 1, the vortex tube 3 generates hot airflow through its own vortex rectification structure without consuming energy. Compared with the existing electrically heated hot air knife, this application can effectively reduce the energy consumption and operating cost of the air knife drying system, and the time required for the vortex tube 3 to generate a uniform and stable hot gas supply is shorter and the efficiency is higher. The hot airflow generated by the vortex tube 3 is generated after its own structure is vortex rectified, so the hot airflow generated by the vortex tube 3 is more uniform and reliable, which can make the temperature everywhere uniform when the air knife 1 blows air. Therefore, using the air knife drying system of this application to dry the perovskite liquid film can improve the crystallization uniformity of the perovskite layer dry film. The temperature range of the airflow produced by the vortex tube 3 can be -46°C to 127°C, the compressed air flow rate in the vortex tube 3 can be 220 - 990 SLPM, the gas source pressure of the vortex tube 3 can be 1.4 - 10 Bar, and the vortex tube 3 can be equipped with a temperature regulating valve to meet different process requirements, so that the air knife drying system of this application can be applicable to different requirements and has a wide coverage range.

[0032] In addition, the vortex tube 3 itself does not require any operating components, which facilitates maintenance and replacement; the structure of the vortex tube 3 is small and compact, making the vortex tube 3 easier to install. When the air knife drying system dries the perovskite liquid film, the vortex tube 3 can be installed on the coater for coating the perovskite slurry. The small and compact vortex tube 3 can reduce the load on the coater and improve the overall intensiveness of the coating equipment.

[0033] Among them, the vortex tube 3 can have a hot end 33 and a cold end 34. After vortex rectification, the vortex tube 3 will generate two airflows, a hot air flow and a cold air flow. The hot air flow flows out through the hot end 33 of the vortex tube 3 and further flows towards the air knife 1, and the cold air flow flows out through the cold end 34 of the vortex tube 3. To facilitate the collection of the cold air flow formed by the vortex tube 3, the cold end 34 of the vortex tube 3 can be connected to the cold air collection device 4, so that the cold air flow in the vortex tube 3 can flow into the cold air collection device 4 and be collected by the cold air collection device 4.

[0034] One or more vortex tubes 3 can be provided. When multiple vortex tubes 3 are provided, each vortex tube 3 can be respectively connected to a drying gas supply device 2 through a first connection pipeline 31. A pressure controller 311 is respectively provided on each first connection pipeline 31. Through the pressure controller 311 on the first connection pipeline 31, the gas pressure flowing into each vortex tube 3 can be controlled to be the same or basically the same, so that the flow rate, temperature, etc. of the hot air flow generated by each vortex tube 3 are basically the same. When multiple vortex tubes 3 supply hot air flow to the same air knife 1, the uniformity of the pressure and temperature in the air knife 1 can be effectively improved, thereby improving the drying effect of the air knife 1.

[0035] Air inlets 11 are respectively provided on opposite sides of the air knife 1. The air inlets 11 of the air knife 1 can be connected to the hot end 33 of the vortex tube 3, so that the hot air flow generated by the vortex tube 3 can flow into the air knife 1 through the air inlets 11 of the air knife 1. Among them, the air inlets 11 of the air knife 1 and the hot end 33 of the vortex tube 3 can be connected through a second connection pipeline 32, so that the hot air flow generated in the vortex tube 3 can flow into the second connection pipeline 32 and further flow towards the air inlets 11 of the air knife 1 through the second connection pipeline 32. To facilitate the control of the gas pressure flowing into the air knife 1, a pressure controller 311 can be provided on the second connection pipeline 32, and this pressure controller 311 can control the gas pressure flowing into the air knife 1.

[0036] By respectively arranging air inlets 11 on the opposite sides of the air knife 1, hot air flow can flow into the interior of the air knife 1 from the opposite ends of the air knife 1, improving the uniformity of the hot air flow distribution inside the air knife 1 and making the temperature inside the air knife 1 more uniform. By arranging a pressure controller 311 on the second connecting pipeline 32, the pressure of the hot air flow entering each air inlet 11 can be controlled to be consistent, further improving the uniformity of the hot air flow distribution inside the air knife 1 and making the temperature inside the air knife 1 more uniform.

[0037] The two air inlets 11 of the air knife 1 are connected to at least one vortex tube 3 so that at least one vortex tube 3 supplies hot air flow to the air inlets 11 on the opposite sides of the air knife 1. Specifically, when the two air inlets 11 of the air knife 1 are connected to one vortex tube 3, the second connecting pipeline 32 connected to the vortex tube 3 can form two branches, and each branch is connected to one air inlet 11 of the air knife 1, so that one vortex tube 3 can supply hot air flow to the two air inlets 11 of the air knife 1. When the air knife 1 is connected to multiple vortex tubes 3, each air inlet 11 of the vortex tube 3 can be respectively connected to one vortex tube 3, so that each air inlet 11 can be supplied with hot air flow through the corresponding vortex tube 3; for example, referring to Figure 1 , when air inlets 11 are respectively arranged on the opposite sides of the air knife 1, two vortex tubes 3 can be arranged. The two vortex tubes 3 are distributed on the opposite sides of the air knife 1, and each vortex tube 3 is connected to one air inlet 11 of the air knife 1 and supplies hot air flow.

[0038] Referring to Figure 2, when the length of the air knife 1 is relatively long, the air inlets 11 of the air knife 1 can also be set to more than two. The multiple air inlets 11 include a first air inlet 111 on one side of the air knife 1, a second air inlet 112 on the other side of the air knife 1, and a third air inlet 113 between the first air inlet 111 and the second air inlet 112. The first air inlet 111 and the second air inlet 112 can be located on opposite sides of the air knife 1 along the length direction of the air knife 1. The third air inlet 113 can be provided with one or more, and the number of the third air inlets 113 can be proportional to the length of the air knife 1. When the length of the air knife 1 increases, only introducing air from opposite sides of the air knife 1 may cause uneven distribution of the hot air flow inside the air knife 1. At this time, the third air inlet 113 can be increased. The first air inlet 111, one or more third air inlets 113, and the second air inlet 112 are evenly spaced along the length direction of the air knife 1, and the first air inlet 111, the second air inlet 112, and the third air inlet 113 can be respectively connected to the hot air flow. By introducing air from multiple points through the first air inlet 111, the second air inlet 112, and the third air inlet 113, the uniformity of the hot air flow distribution inside the air knife 1 can be improved and the temperature inside the air knife 1 can be made more uniform. Among them, the first air inlet 111 can be connected to a vortex tube 3 through a second connecting pipe 32, the second air inlet 112 can be connected to a vortex tube 3 through a second connecting pipe 32, and each third air inlet 113 can be connected to a vortex tube 3 through a second connecting pipe 32. A pressure controller 311 is respectively arranged on each second connecting pipe 32 to control the gas pressure flowing into the air knife 1 from each air inlet 11 to be consistent.

[0039] Referring to Figure 3 , a heat insulation and heat preservation component 5 can be attached to the outer surface of the air knife 1. The heat insulation and heat preservation component 5 is used to isolate the heat transfer between the inside of the air knife 1 and the outside, so that the temperature inside the air knife 1 can be not affected or basically not affected by external factors, and can block the heat inside the air knife 1 from dissipating to the outside. In addition, for the convenience of the hot air flow entering the inside of the air knife 1, the heat insulation and heat preservation component 5 is provided with a relief hole for avoiding the air inlet 11. One end of the second connecting pipe 32 is connected to the vortex tube 3, and the other end passes through the relief hole of the heat insulation and heat preservation component 5 and is connected to the air inlet 11, so that the air inlet 11 can be connected to the vortex tube 3 and receive the hot air flow provided by the vortex tube 3.

[0040] The thermal insulation component 5 includes an insulating layer 51, a heating layer 52, and a heat-conducting layer 53 arranged from outside to inside. The outermost insulating layer 51 is made of insulating material, and the insulating layer 51 is used to isolate the heat transfer between the outside and the heating layer 52, the heat-conducting layer 53, and the air knife 1 inside the insulating layer 51. The insulating layer 51 can be prepared from materials that are flexible, have good heat insulation performance, have adhesiveness, or are easily adhered to the heating layer 52. For example, the insulating layer 51 is prepared from insulating foam, specifically, it can be prepared from TIF insulating foam. The heating layer 52 can generate heat after being energized to heat the inside of the air knife 1. Specifically, the heating layer 52 can be an electric heating wire heat source prepared from electric heating wires. The heat-conducting layer 53 is arranged between the heating layer 52 and the air knife 1, and the heat-conducting layer 53 is used to receive the heat generated by the heating layer 52 and evenly conduct the heat generated by the heating layer 52 to the outer surface of the air knife 1 to uniformly heat the inside of the air knife 1. The heat-conducting layer 53 is prepared from materials with good heat conductivity. For example, the heat-conducting layer 53 is a heat-conducting silicon wafer.

[0041] By using the insulating layer 51 for heat insulation, the heat generated by the heating layer 52 and the heat of the hot air flow entering the inside of the air knife 1 can be blocked from dissipating to the outside, thereby improving the utilization rate of heat in the air knife drying system and reducing the operating cost of the air knife drying system. By using the heating layer 52 and the heat-conducting layer 53 in cooperation to heat the air knife 1, the inside of the air knife 1 can have a uniform and stable initial temperature even when no hot air flow is introduced; moreover, the initial temperature inside the air knife 1 can have a small temperature difference from the hot air flow, thereby weakening the heat exchange between the hot air flow and the initial gas inside the air knife 1, and the air flow blown out by the air knife 1 can have a higher and more uniform temperature, improving the drying effect of the air knife 1.

[0042] To facilitate the detection of the temperature of the air knife 1, the thermal insulation component 5 can further include a temperature detection component 54. The temperature detection component 54 is arranged inside the heat-conducting layer 53 and attached to the air knife 1. The temperature detection component 54 is used to detect the temperature of the main body of the air knife 1, thereby judging whether the inside of the air knife 1 reaches the required initial temperature, and being able to detect whether the temperature inside the air knife 1 is uniform. Among them, the temperature detection component 54 can specifically be a thermocouple.

[0043] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Without departing from the principles and purposes of the present invention, those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and all these changes should fall within the protection scope of the claims of the present invention.

Claims

1. An air knife drying system, characterized in that, Comprising: An air knife (1) with air inlets (11) provided on opposite sides thereof; A dry gas supply device (2) for supplying dry gas; A vortex tube (3), one end of which is connected to the dry gas supply device (2). The vortex tube (3) can receive the dry gas supplied by the dry gas supply device (2) and form a hot air flow. The other end of the vortex tube (3) is connected to the air inlet (11) of the air knife (1) to supply the hot air flow into the air knife (1); Wherein, at least one of the vortex tubes (3) is used to supply the hot air flow to the air inlets (11) on opposite sides of the air knife (1).

2. The air knife drying system according to claim 1, characterized in that, There are at least two of the vortex tubes (3). The two vortex tubes (3) are distributed on opposite sides of the air knife (1). Each vortex tube (3) is connected to one air inlet (11) of the air knife (1) and supplies the hot air flow.

3. The air knife drying system according to claim 1, wherein The dry gas supply device (2) is connected to the vortex tube (3) through a first connecting pipeline (31). A pressure controller (311) is provided on the first connecting pipeline (31). The pressure controller (311) is used to control the gas pressure flowing into the vortex tube (3).

4. The air knife drying system according to claim 1, characterized in that, The vortex tube (3) is connected to the air inlet (11) of the air knife (1) through a second connecting pipeline (32). A pressure controller (311) is provided on the second connecting pipeline (32). The pressure controller (311) is used to control the gas pressure flowing into the air knife (1).

5. The air knife drying system according to claim 1, wherein It further includes a cold air collection device (4). The vortex tube (3) has a hot end (33) and a cold end (34). The hot air flow formed in the vortex tube (3) flows to the air knife (1) through the hot end (33), and the cold air flow formed in the vortex tube (3) flows to the cold air collection device (4) through the cold end (34).

6. The air knife drying system according to claim 1, wherein, There are multiple air inlets (11) on the air knife (1). The multiple air inlets (11) include a first air inlet (111) on one side of the air knife (1), a second air inlet (112) on the other side of the air knife (1), and a third air inlet (113) between the first air inlet (111) and the second air inlet (112). There is one or more of the third air inlets (113), and the first air inlet (111), one or more of the third air inlets (113), and the second air inlet (112) are evenly spaced along the length direction of the air knife (1).

7. The air knife drying system according to claim 1, wherein, A heat insulation and heat preservation component (5) is attached to the outer surface of the air knife (1). The heat insulation and heat preservation component (5) is used to block the heat transfer between the inside of the air knife (1) and the outside. The heat insulation and heat preservation component (5) is provided with an avoidance hole for avoiding the air inlet (11), and the vortex tube (3) is connected to the air inlet (11) through the avoidance hole.

8. The air knife drying system according to claim 7, characterized in that, The heat insulation component (5) includes an adiabatic layer (51), a heating layer (52), and a heat conduction layer (53) arranged from outside to inside. The heating layer (52) is used to generate a heat source, and the heat conduction layer (53) is used to receive the heat source generated by the heating layer (52) and transfer it to the outer surface of the air knife (1). The adiabatic layer (51) blocks heat transfer with the outside world.

9. The air knife drying system according to claim 8, characterized in that, The heat insulation component (5) further includes a temperature detection member (54). The temperature detection member (54) is attached to the air knife (1) and is used to detect the temperature of the air knife (1).

10. The air knife drying system according to claim 9, characterized in that, The adiabatic layer (51) is made of an adiabatic foam layer, the heating layer (52) is an electric heating wire heat source, the heat conduction layer (53) is a heat conduction silicon wafer, and the temperature detection member (54) is a thermocouple.

Images