Air knife

Abstract

The invention belongs to an air supply device for drying solid materials or products, and particularly relates to an air knife. According to the large-size air knife, the homogenizing assembly is arranged between the pore plates and can be matched with the air supply assembly and the pore plates, the uniformity of the air outlet speed and the uniformity of the temperature at all point positions on the air outlet line are effectively guaranteed, the internal structure design of the large-size air knife can be remarkably optimized, and the size simplification and light weight of the large-size air knife are achieved. The homogenizing assembly can effectively reduce the pressure difference and the temperature difference between gas entering the dispersing cavity and gas exhausted out of the dispersing cavity, so that the energy loss in the system operation process is reduced, and the overall energy efficiency ratio is increased.

Description

Technical Field

[0001] This application belongs to an air supply device for drying solid materials or products, and particularly relates to an air knife. Background Art

[0002] In the manufacturing processes of perovskite solar cells and lithium-ion batteries, as a key drying equipment, the air knife is mainly used for the rapid directional drying of the slurry after the coating process. This air knife drying link is crucial for the performance of the thin film material because the uniformity of the drying process directly affects the quality of the thin film. If the drying is insufficient or there is residual solvent, it may cause pinholes, cracks or other defects on the thin film surface, thereby significantly reducing the photoelectric conversion efficiency or electrochemical performance of the battery. Therefore, the design and performance of the air knife directly determine the yield and quality of perovskite solar cell and lithium-ion battery products.

[0003] The structure of a conventional air knife includes a pressure chamber. Gas inlets and linear slits are respectively arranged at the upper and lower ends of the pressure chamber, and gas outlets for purging the thin film are formed at the ends of the linear slits. During use, the pressurized gas enters the pressure chamber from the gas inlet, and then will be converted into a laminar flow form along the linear slit, and finally be blown out at a high speed and uniformly at the gas outlet. This air flow can efficiently and uniformly remove the solvent on the thin film surface, thereby achieving the effect of rapid drying. The core of this structural design lies in the precise cooperation between the pressure chamber and the linear slit. The pressure chamber is responsible for buffering the incoming gas and reducing turbulence, thereby providing a relatively stable gas supply for the linear slit, while the linear slit precisely controls the distribution of the air flow through its geometric structure, converting the gas from a turbulent flow into a laminar flow form. The two work together to ultimately ensure the uniformity of the air flow and temperature uniformity of the air knife, thereby guaranteeing the quality of the thin film.

[0004] At present, the optimization focus of the air knife structure mostly concentrates on the internal design of the pressurization chamber, aiming to slow down the turbulence phenomenon generated when the pressurized gas enters it by improving the internal structure of the chamber, so as to provide a more stable and uniform gas supply for the linear slit. For example, on the gas flow path in the pressurization chamber, multiple sets of orifice plates are added, and the gas is sieved step by step through the pores of the orifice plates to achieve the pre-laminar flow treatment of the gas. However, with the rapid development of the perovskite industry and the lithium battery industry, to match the demand for preparing wider films, the length of the air knife needs to be extended from the existing 1200 mm to about 2500 mm or even longer. However, under the above existing pressurization chamber design, to achieve a uniform air outlet effect for the large-size air knife, the number of orifice plates equipped in the pressurization chamber needs to be increased. More orifice plates require a larger installation space, which means that the length of the pressure chamber in the longitudinal direction also needs to be increased accordingly. However, although increasing the number of orifice plates and expanding the volume can improve the air flow uniformity, it will also bring direct negative impacts: the temperature difference and pressure difference between the air inlet and outlet of the air knife will be larger, resulting in a significant increase in system energy consumption. Therefore, how to meet the demand for uniform air outlet of the large-size air knife while minimizing the longitudinal height of the pressurization chamber and reducing the equipment energy consumption has become the core problem in the current air knife design. Summary of the Invention

[0005] To solve the above technical problems, the present application provides a large-size air knife with high air outlet wind speed uniformity, high air outlet temperature uniformity, appropriate volume and low energy consumption, which is specifically realized through the following technical solutions: An air knife, comprising: a dispersion chamber enclosed by a long-side wind baffle, a short-side wind baffle, and a connecting wind baffle; a air supply component for introducing gas into the dispersion chamber is connected to the upper end of the dispersion chamber in a through manner; along the gas flow direction, a stable area and a pressurization area are sequentially arranged in the dispersion chamber; at least two groups of orifice plates for homogenizing the gas introduced by the air supply component are arranged in the stable area; the pressurization area is formed by the long-side wind baffles approaching each other, and the lower end of the pressurization area of the dispersion chamber is communicated with the outside through an air outlet line; the air supply component includes at least two groups of air inlet pipes connected to the dispersion chamber in a through manner; at least one group of homogenizing components is integrated between the orifice plates inside the dispersion chamber, the homogenizing component includes a plurality of flow guiding partitions connected to the long-side wind baffle and arranged in an array staggered distribution in the longitudinal direction, and the free ends of each flow guiding partition partially overlap in the longitudinal direction; along the axial direction of the long-side wind baffle, both ends of the flow guiding partition extend to the short-side wind baffle; a tortuous flow path for the gas to pass through is formed between the flow guiding partitions; the homogenizing component further includes a locking member for fixedly connecting the free ends of the flow guiding partitions to each other.

[0006] Preferably, the flow guiding partition plate on the side close to the air supply assembly is a load plate, and the flow guiding partition plate on the side far from the air supply assembly is a dispersion plate; the flow guiding partition plates distributed between the load plate and the dispersion plate are drainage plates; the length of the load plate is less than that of the drainage plate; and / or, the length of the dispersion plate is less than that of the drainage plate.

[0007] Preferably, the locking member penetrates through the flow guiding partition plate, and the locking member is distributed on the symmetry plane between the long side windshields.

[0008] Preferably, the air inlet pipe is correspondingly arranged above the locking member.

[0009] Preferably, the tortuous flow path includes at least two groups of curved spaces connected in series, and both ends of the curved space are respectively arranged on the same side of the locking member close to the same long side windshield; the deviation of the ventilation cross-sectional area in the curved space is 0-20%.

[0010] Preferably, the perpendicular distance between the free end of the drainage plate and the opposite long side windshield is 2-4 times the projection length of the air outlet line on the plane where the short side windshield is located.

[0011] Preferably, the air inlet pipes are arranged in an array along the axial direction of the connecting windshield, and two adjacent air inlet pipes are connected to each other and share the same upper-level pipe.

[0012] Preferably, reinforcing ribs are arranged on the outer wall of the long side windshield corresponding to the pressurization area.

[0013] Preferably, along the axial direction of the long side windshield, the strength at the longitudinally corresponding position of the reinforcing rib and the air inlet pipe is higher than that at other positions.

[0014] Compared with the prior art, the present application has the following beneficial effects: By arranging the homogenizing assembly between the orifice plates, the present application can cooperate with the air supply assembly and the orifice plates, not only effectively ensuring the uniformity of the air outlet speed and temperature at each point position on the air outlet line, but also significantly optimizing the internal structure design of the large-size air knife, realizing the reduction and light weight of its volume. The homogenizing assembly can effectively reduce the pressure difference and temperature difference between the gas entering and discharging from the dispersion chamber, thereby reducing the energy loss during the operation of the system and improving the overall energy efficiency ratio.

[0015] By setting the length of the load plate on the side close to the air supply component in this application, the acting force of the high-pressure gas on the free end of the load plate can be effectively reduced. This design can avoid the problem of the overall deformation of the bypass flow channel caused by the locking relationship of the locking parts, thereby improving the stability and reliability of the system. At the same time, this avoidance design can directly increase the initial flow rate and velocity of the high-pressure gas flowing into the bypass flow channel, achieving the effects of reducing energy consumption and ensuring the flow rate and temperature of the air outlet line.

[0016] By reasonably designing the length of the dispersion plate on the side far from the air supply component in this application, it can be ensured that the gas processed by the bypass flow channel can flow out faster and more smoothly. This design not only helps to reduce the unnecessary residence time of the gas in the flow channel, reduce the flow resistance, but also can effectively reduce the flow rate and temperature difference, thereby further reducing the energy consumption loss of the gas.

[0017] By setting the locking part on the symmetry plane between the long-side windshields, and further setting the air inlet pipe above the locking part in this application, the deformation problem of the homogenization component caused by the overlong diversion partition and the concentrated wind force of the air inlet pipe under the large-size air knife can be mitigated by virtue of the fixed relationship between the diversion partition and the locking part, the dimensional stability of the ventilation section of the bypass flow channel can be improved, and the gas energy loss caused by deformation during the homogenization process can be reduced.

[0018] By arranging reinforcing ribs on the outer wall of the long-side windshield corresponding to the pressurization area in this application, and further, by increasing the strength at the longitudinal corresponding position of the reinforcing rib and the air inlet pipe, the problem of uneven air flow discharge caused by the longer length of the air outlet line and the larger deflection deformation at the corresponding position of the air knife and the air inlet pipe under the large-size air knife can be effectively solved. Brief Description of the Drawings

[0019] To clearly introduce the embodiments, the drawing surfaces of the attached drawings will be briefly introduced below: Figure 1 It is a schematic diagram of the overall structure of the air knife in Embodiment 1; Figure 2 It is a cross-sectional view of a partial structure of the air knife in Embodiment 1; Figure 3 It is a cross-sectional view of a partial structure of the air knife in Embodiment 1; Reference Signs: 100, dispersion cavity; 110, long-side windshield; 120, short-side windshield; 130, connecting windshield; 140, stable area; 150, pressurization area; 160, orifice plate; 170, air outlet line; 200, air supply component; 210, air inlet pipe; 300, homogenization component; 310, diversion partition; 311, load plate; 312, dispersion plate; 313, drainage plate; 320, locking part. Detailed Description of the Invention

[0020] The following will further describe the present application by way of specific embodiments. Those of ordinary skill in the art will be able to implement the present application based on these descriptions. In addition, the embodiments of the present application involved in the following description are usually only a part of the embodiments of the present application, rather than all of the embodiments. Therefore, all other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts should fall within the scope of protection of the present application.

[0021] Embodiment 1 Referring to the accompanying drawings, this embodiment provides an air knife, including: A dispersion chamber 100 is formed by enclosing a set of relatively arranged long-side windshields 110, a set of short-side windshields 120 arranged at both ends of the long-side windshields 110, and a connecting windshield 130 for connecting the upper ends of the long-side windshields 110 and the short-side windshields 120. The upper end of the dispersion chamber 100 is connected through a ventilation component 200 for introducing gas into it. Specifically, in this embodiment, to ensure the uniform ventilation effect of the large-sized air knife, four groups of openings are evenly arranged in the connecting windshield 130. Correspondingly, the ventilation component 200 includes four groups of air inlet pipes 210 that are connected through the openings. Two adjacent air inlet pipes 210 are connected to each other and share the same upper-level pipe. The gas inlet ends of the upper-level pipes are connected to each other and share the same main pipe. Through the tree-shaped total-subordinate air supply pipe design in this embodiment, not only the structural design of the ventilation component 200 is streamlined, but also the uniform distribution of gas at the upper end of the dispersion chamber 100 can be promoted.

[0022] Along the gas flow direction, the dispersion chamber 100 is sequentially provided with a stable area 140 and a pressurization area 150; two groups of orifice plates 160 for equalizing the gas introduced by the ventilation component 200 are arranged in the stable area 140; the four sides of the orifice plate 160 are respectively connected to the long-side windshields 110 and the short-side windshields 120. Along the gas flow direction, the stable area 140 is divided into three areas by the two groups of orifice plates 160, namely the first dispersion chamber, the second dispersion chamber, and the third dispersion chamber; the third dispersion chamber is communicated with the pressurization area 150. The pressurization area 150 is formed by the long-side windshields 110 approaching each other, including a converging pressurization area directly communicated with the third dispersion chamber, and a slit pressurization area arranged at the lower end of the first pressurization area; the lower end of the slit pressurization area is communicated with the outside through an air outlet line 170; the air outlet line 170 is formed by enclosing the lower edges of the long-side windshields 110 and the short-side windshields 120.

[0023] A set of homogenization components 300 are integrated in the second dispersion chamber. The homogenization components 300 include diversion partition plates 310 that are arranged in an array and staggered in the longitudinal direction. Each diversion partition plate 310 extends non - contactingly from the surfaces of the long - side windshields 110 on both sides towards the opposite side in sequence, and the free ends of the diversion partition plates 310 are partially overlapped in the longitudinal direction; along the axial direction of the long - side windshields 110, both ends of the diversion partition plates 310 extend to the short - side windshields 120; a tortuous flow path for gas to pass through is formed between the diversion partition plates 310. In this embodiment, the diversion partition plate 310 close to the air supply component 200 is a load plate 311, the diversion partition plate 310 far from the air supply component 200 is a dispersion plate 312; the diversion partition plates 310 distributed between the load plate 311 and the dispersion plate 312 are drainage plates 313; the non - contact extension distances of the load plate 311 and the dispersion plate 312 are less than that of the drainage plate 313.

[0024] The homogenization components 300 further include locking members 320 for fixedly connecting the free ends of the diversion partition plates 310 to each other. The tortuous flow path includes at least two sets of connected curved spaces. The two ends of each curved space are respectively arranged on the same side of the locking member 320 close to the same long - side windshield 110; the ventilation cross - sectional areas in the curved spaces are the same, which means the height differences between the diversion partition plates 310 are the same, and this height difference is equal to the perpendicular distance between the free end of the drainage plate 313 and the opposite long - side windshield 110. Of course, it can be understood that in other embodiments, the deviation of the ventilation cross - sectional areas in the curved spaces is between 0% and 20%. Further, in this embodiment, the perpendicular distance between the free end of the drainage plate 313 and the opposite long - side windshield 110 is twice the projection length of the air outlet line 170 on the plane where the short - side windshield 120 is located, and the width of the air line 170 is 1 mm. Of course, it can be understood that in other embodiments, the width of the air line 170 can also be selected from between 1 mm and 5 mm. By controlling the ventilation cross - sectional area inside the curved space in this embodiment, the energy loss of the gas during the homogenization process in the curved space can be reduced.

[0025] In this embodiment, the locking member 320 penetrates through the flow guiding partition 310 and is distributed on the symmetry plane of the overlapping part in the longitudinal direction between the drainage plates 313; the symmetry plane is parallel to the long side wind baffle 110. The locking member 320 is provided in four groups, and the air inlet duct 210 is correspondingly arranged directly above the locking member 320. In this embodiment, by arranging the locking member 320 on the symmetry plane of the overlapping part in the longitudinal direction between the drainage plates 313 and further arranging the air inlet duct 210 above the locking member 320, the fixing relationship between the flow guiding partition 310 and the locking member 320 can be utilized to slow down the deformation problem of the homogenization assembly 300 caused by the overlong flow guiding partition 310 and the concentrated wind force of the air inlet duct 210 under a large-sized air knife, improve the dimensional stability of the ventilation cross-section of the bypass flow channel, and reduce the gas energy loss caused by deformation during the homogenization process.

[0026] In this embodiment, considering that the negative pressure is relatively large at the air outlet line 170 directly below the air inlet duct 210, which is prone to deflection deformation and cause problems with air outlet uniformity, reinforcing ribs are also provided on the outer wall of the long side wind baffle 110 corresponding to the pressurizing area 150. And along the axial direction of the long side wind baffle 110, the strength at the longitudinal corresponding position of the reinforcing ribs and the air inlet duct 210 is higher than that at other positions. Specifically, the reinforcing ribs are divided into three sections, namely the reinforcing rib, the strengthening rib, and the weakening rib, which are connected in sequence. Among them, the strength of the reinforcing rib is higher on the side closer to the strengthening rib, and the strength of the weakening rib is also higher on the side closer to the strengthening rib. This segmented design can be targeted for reinforcement according to the force characteristics of different areas of the air knife, ensuring a more reasonable rigid distribution of the overall structure. By setting the reinforcing ribs, the overall rigidity of the air knife main structure is effectively enhanced, thereby significantly reducing the deflection deformation at the middle position of the air knife and avoiding problems with uneven air flow distribution caused by the deformation of the air knife.

[0027] In addition, this embodiment also details the specific use process of the air knife: Compressed gas enters the first dispersion chamber from the four air inlet ducts 210 of the air supply assembly 200, is initially buffered and diffused inside the first dispersion chamber to reduce the turbulence effect of the air flow and ensure the stability of the air flow; then it passes through the first layer of orifice plate 160 and enters the second dispersion chamber. The homogenization assembly 300 in the second dispersion chamber performs preliminary laminar flow treatment on the gas. Specifically, the gas flows along the bypass flow channel formed by the flow guiding partition 310, and through multi-stage diversion and splitting, the air flow distribution is further homogenized; subsequently, the gas diffuses to the lower end of the second dispersion chamber under the action of the dispersion plate 312 to ensure uniform air flow distribution; then it passes through the second layer of orifice plate 160 and enters the third dispersion chamber and the converging pressurizing area. In the converging pressurizing area, the air flow is further buffered and pressurized through the converging structure to increase the speed and stability of the air flow; finally, the air flow is output through the slit pressurizing area and the air outlet line 170 to form a high-speed, uniform and stable air flow, meeting the application requirements of efficient purging and drying.

Claims

1. A wind knife, comprising: A dispersion chamber (100) is formed by enclosing a long-side wind shield (110), a short-side wind shield (120), and a connecting wind shield (130); the upper end of the dispersion chamber (100) is connected through an air supply assembly (200) for introducing gas therein; along the gas flow direction, the dispersion chamber (100) is provided with a stabilization zone (140) and a pressurization zone (150) in sequence; at least two groups of orifice plates (160) are provided in the stabilization zone (140) for homogenizing the gas introduced by the air supply assembly (200); the pressurization zone (150) is formed by the long-side wind shields (110) being close to each other, and the lower end of the pressurization zone (140) of the dispersion chamber (100) is connected to the outside through an air outlet line (170); It is characterized in that The air supply assembly (200) comprises at least two groups of air inlet ducts (210) which are connected to the dispersion chamber (100); At least one group of homogenizing components (300) is integrated between the orifice plates (160) inside the dispersion chamber (100), and the homogenizing component (300) comprises a plurality of flow guide baffles (310) connected to the long side wind shield plates (110) and arranged in an array-like staggered manner in the longitudinal direction, and the free ends of the flow guide baffles (310) are partially overlapped in the longitudinal direction; along the axial direction of the long side wind shield plates (110), the two ends of the flow guide baffles (310) extend to the short side wind shield plates (120); a circuitous flow channel for gas to pass through is formed between the flow guide baffles (310); and the homogenizing component (300) further comprises a locking member (320) for fixing the free ends of the flow guide baffles (310) to each other.

2. The air knife according to claim 1, characterized in that: The guide baffle (310) on the side close to the air supply component (200) is a load plate (311), and the guide baffle (310) on the side away from the air supply component (200) is a dispersion plate (312); the guide baffle (310) distributed between the load plate (311) and the dispersion plate (312) is a guide plate (313); The load plate (311) is shorter than the guide plate (313); and / or, The dispersion plate (312) is shorter than the guide plate (313).

3. The air knife according to claim 2, characterized in that: The locking piece (320) is arranged to penetrate the guide baffle (310), and the locking piece (320) is distributed on the symmetrical plane between the long-side wind shielding plates (110).

4. The air knife according to claim 3, characterized in that: The air inlet duct (210) is correspondingly arranged above the locking member (320).

5. The wind knife according to claim 2, characterized in that: The circuitous flow channel comprises at least two groups of through-connected curved spaces, with the two ends of the curved spaces respectively arranged on the same side of the locking member (320) close to the same long-side wind shield plate (110); the ventilation cross-sectional area deviation in the curved space is 0-20%.

6. The wind knife according to claim 5, characterized in that: The vertical distance between the free end of the guide plate (313) and the long side wind shield plate (110) on the opposite side is 2 to 4 times the length of the projection of the air outlet line (170) on the plane where the short side wind shield plate (120) is located.

7. The air knife according to claim 1, characterized in that: The air inlet ducts (210) are arranged in an array along the axial direction of the wind shielding plate (130), and two adjacent air inlet ducts (210) are connected to each other and share the same upper duct.

8. The air knife according to claim 1, characterized in that: Reinforcing ribs are provided on the outer wall of the long side wind shield plate (110) corresponding to the supercharging area (150).

9. The wind knife according to claim 8, characterized in that: Along the axial direction of the long-side wind shield (110), the strength of the reinforcing ribs at the positions corresponding to the longitudinal direction of the air inlet duct (210) is higher than that of other positions.

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