CN120720848A - Air knife - Google Patents
Air knifeInfo
- Publication number
- CN120720848A CN120720848A CN202511222619.1A CN202511222619A CN120720848A CN 120720848 A CN120720848 A CN 120720848A CN 202511222619 A CN202511222619 A CN 202511222619A CN 120720848 A CN120720848 A CN 120720848A
- Authority
- CN
- China
- Prior art keywords
- distribution
- distribution chamber
- air knife
- cavity
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
- F26B21/50—Ducting arrangements from the source of air or other gases to the materials or objects being dried
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air-Flow Control Members (AREA)
Abstract
The invention relates to the technical field of drying devices, in particular to an air knife. The gas flow distribution device comprises a lower die, an upper die and a gasket, wherein the lower die is provided with at least one gas inlet channel for accessing gas, a plurality of distribution cavities are sequentially arranged in the gas flow direction and are communicated with the gas inlet channel, the longitudinal heights of the distribution cavities decrease from the upstream to the downstream of the gas flow, the gas can form a serpentine flow path in the distribution cavities, the serpentine flow path comprises a low part, a high part and a middle part, the high part is positioned between the low part and the middle part, the highest point of the low part is the same as the highest point of the middle part and is the lowest point of the high part, the lowest point of the low part is lower than the lowest point of the middle part, and the distribution cavity positioned at the most downstream of the gas flow direction is communicated with a lip. The serpentine flow path is easy to form laminar flow, so that turbulence is greatly reduced, and the time domain fluctuation of wind speed sprayed out by the lip is smaller.
Description
Technical Field
The invention relates to the technical field of drying devices, in particular to an air knife.
Background
In the perovskite coating production process, the coating process and the coating drying process are included, the coating process is generally finished by using a liquid coating die head A, the coating drying process is finished by using a liquid coating die head B at the rear end of the coating process, the structures of the liquid coating die head A and the liquid coating die head B are completely the same in the actual production at present, the liquid coating die head is a die head designed for perovskite coating liquid, the uniformity of the perovskite coating liquid in the die head can meet the requirements of the coating process, but the drying effect when the liquid coating die head is used for the coating drying process is not ideal. The reason is that the liquid coating die head B needs to adopt compressed air as drying gas to be introduced into the die head in the coating and drying process, and the compressed air is easy to generate turbulence when being introduced into the liquid coating die head B, so that the gas flow at the outlet of the liquid coating die head B is unstable, and the single point position has larger flow velocity amplitude fluctuation in the time domain, thereby further causing the deterioration of the transverse consistency of the gas flow at the outlet of the liquid coating die head B. The essential reasons are that the structure of the liquid coating die head B is designed for perovskite coating liquid, so that liquid phase substances can flow more uniformly, the flowing direction of compressed air in the liquid coating die head B is not the same as that of liquid, the transverse consistency of the gas flow at the outlet of the liquid coating die head B in the coating and drying process is deteriorated, and coating is scrapped when serious.
In the industry, perovskite liquid coating dies are generally adopted, and one die is dual-purpose, namely, two perovskite liquid coating dies respectively finish a coating process and a coating drying process. For example, patent document CN214864866U, as shown in fig. 1, discloses a slot-type coating die for perovskite solution, which comprises a left die and a right die fixed together by bolts, protruding die lips are provided at the bottoms of the left die and the right die, a liquid outlet for spilling perovskite coating liquid is provided in the middle of the die lips, a vacuum pipe is provided in the left die and a negative pressure cavity is provided in the die lips, an inner sealing cavity is also provided in the negative pressure cavity, and a first cavity and a second cavity, and a liquid inlet channel and a liquid return channel for ingress and egress of perovskite coating liquid are provided in the right die, respectively. The multi-cavity design reduces the impact of high-flow solution at the liquid outlet on solution distribution at the die lip, ensures the stability of solution distribution, effectively shortens the length of a direct current zone in the die head, and can reduce the hydraulic pressure of the solution at the die lip under the condition of ensuring uniform solution distribution at the die lip, thereby reducing leakage and outflow of perovskite coating solution with low viscosity and high density at the die lip due to gravity, liquid supply hydraulic pressure and other reasons. The above application is designed in consideration of the distribution uniformity of the high-flow solution, and when compressed gas is introduced into the second cavity and the third cavity, turbulence is easy to generate, and the longitudinal stability and the transverse uniformity of the outlet gas flow are poor.
In summary, the die head in the coating and drying process needs to be improved in a targeted manner, which has important significance in improving the perovskite coating production efficiency, reducing product scrapping and reducing manufacturing cost.
Disclosure of Invention
The invention aims to provide an air knife which is used for improving the uniformity of air quantity at all positions when the air knife blows. Improving the perovskite coating production efficiency and reducing the product rejection.
In order to solve the technical problems, the invention provides an air knife, which comprises a lower die, an upper die and a gasket arranged between the lower die and the upper die, wherein the lower die is provided with at least one gas inlet channel for accessing gas, a plurality of communicated distribution cavities are sequentially arranged along the gas flow direction, the distribution cavity positioned at the most upstream of the gas flow direction is communicated with the gas inlet channel, the longitudinal heights of the distribution cavities are gradually decreased from the upstream to the downstream of the gas flow, the gas can form a snake-shaped flow path in the distribution cavities, the snake-shaped flow path comprises a low part, a high part and a middle part, the high part is positioned between the low part and the middle part, the highest point of the low part and the highest point of the middle part are the same and are the lowest point of the high part, the lowest point of the low part is 8-12 mm lower than the lowest point of the middle part, a lip is formed between the lower die and the upper die, the lip is positioned at the tail end of the gas flow, and the distribution cavity positioned at the most downstream of the gas flow direction is communicated with the lip.
Preferably, the volumes of the plurality of distribution cavities decrease along the gas flow direction, and arc chamfer angles are arranged at the corners of the plurality of distribution cavities.
Preferably, the plurality of distribution cavities are at least three, and the three distribution cavities are respectively a first distribution cavity communicated with the gas inlet channel, a third distribution cavity communicated with the lip and a second distribution cavity positioned between the first distribution cavity and the third distribution cavity, and a choke flow passage is arranged between the lip and the third distribution cavity.
Preferably, the longitudinal heights of the first distribution cavity, the second distribution cavity and the third distribution cavity are gradually decreased, the longitudinal height of the first distribution cavity is 1.5-2.5 times of the longitudinal height of the second distribution cavity, and the longitudinal height of the second distribution cavity is 1.5-2.5 times of the longitudinal height of the third distribution cavity.
Preferably, the width of the first distribution cavity is 1-1.5 times of the width of the second distribution cavity, and the width of the second distribution cavity is 1-1.5 times of the width of the third distribution cavity.
Preferably, the longitudinal height of the flow blocking flow channel is 0.05-0.25 mm, and the top of the flow blocking flow channel is flush with the top of the third distribution cavity.
Preferably, the length of the gas inlet channel in the gas flow direction is 1-2 times the width of the first distribution chamber, and the length of the choke flow channel in the gas flow direction is 1-2 times the width of the first distribution chamber.
Preferably, the first distribution cavity comprises a first arc and a second arc, a third arc and a fourth arc are arranged at the joint of the first distribution cavity and the second distribution cavity, the second distribution cavity comprises a fifth arc and a sixth arc, a seventh arc and an eighth arc are arranged at the joint of the second distribution cavity and the third distribution cavity, a ninth arc and a tenth arc are arranged in the third distribution cavity, and an eleventh arc is arranged at the joint of the third distribution cavity and the flow blocking flow channel.
The first distribution cavity, the second distribution cavity and the third distribution cavity are arranged between the lower die and the upper die, the first distribution cavity and the third distribution cavity are arranged on the lower die at intervals, and the second distribution cavity is arranged on the upper die and is communicated with the first distribution cavity and the third distribution cavity.
Preferably, the width of the first distribution chamber, the width of the second distribution chamber and the width of the third distribution chamber are the same.
The beneficial effects of the invention are as follows:
1. The depths of the first distribution cavity, the second distribution cavity and the third distribution cavity are gradually decreased, and the flow velocity is gradually increased. The first distribution cavity, the second distribution cavity and the third distribution cavity form a snake-shaped flow path together, and compared with the flow lines of the air knife I and the air knife II in the prior art, the snake-shaped flow path is easy to form laminar flow, so that turbulence (vortex and whirl) is greatly reduced, and the time domain fluctuation of the wind speed sprayed by the lips is smaller;
2. Through the size collocation of the first distribution cavity, the second distribution cavity, the third distribution cavity, the flow blocking runner and the circular arc chamfer angles of the cavities, the pressure drop difference of each path during transverse distribution can be reduced, and the uniformity of the outlet wind speed can be obviously improved;
3. the air speed of the lip outlet can be transversely uniform by 97% without an adjusting mechanism, the structure is simple, the processing is easy, the cost of the air knife is lower than that of the air knife with the adjusting mechanism, and meanwhile, the adjustment is avoided, and the debugging difficulty is also reduced.
Drawings
FIG. 1 is a schematic diagram of a structure involved in the background art;
FIG. 2 is a schematic view of a prior art knife one;
FIG. 3 is a schematic diagram of the gas flow direction of a prior art knife one;
FIG. 4 is a schematic diagram of a prior art knife II;
FIG. 5 is a schematic diagram of the gas flow direction of a prior art knife II;
FIG. 6 is a schematic diagram of the structure of the present invention;
FIG. 7 is a schematic view of the lower die structure of the present invention;
FIG. 8 is a schematic view of the upper die structure of the present invention;
FIG. 9 is a side cross-sectional view of the present invention;
FIG. 10 is a three-dimensional rendering of a dispensing chamber of the present invention;
FIG. 11 is a graph of the airflow effect of the dispensing chamber of the present invention;
FIG. 12 is a schematic gas flow diagram of a die of the present invention;
FIG. 13 is a top plan view of the gas flow direction of the die of FIG. 12;
FIG. 14 is a graph of test data for three air knives;
FIG. 15 is a schematic view of the lateral distribution of wind velocity at 1cm of the lip of a knife I in the prior art;
FIG. 16 is a schematic view of the lateral distribution of wind velocity at 1cm of the lip of a second prior art wind knife;
FIG. 17 is a schematic view of the lateral distribution of wind velocity at 1cm of the lip of the air knife III of the invention;
FIG. 18 is a schematic view of the lateral distribution of wind velocity at 3cm of the lip of the air knife III of the present invention;
The reference numerals are 1, a lower die, 11, a first distribution cavity, 12, a third distribution cavity, 13, a gas inlet channel, 2, an upper die, 21, a second distribution cavity, 3, a gasket, 4, a lip, 5, a flow blocking runner, 61, a first arc, 62, a second arc, 63, a third arc, 64, a fourth arc, 65, a fifth arc, 66, a sixth arc, 67, a seventh arc, 68, an eighth arc, 69, a ninth arc, 610, a tenth arc, 611, an eleventh arc, 10, a first air knife, 20, a second air knife, 30 and a third air knife.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description. The embodiments of the invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Fig. 1 is a schematic diagram of a structure related to the background technology, wherein when compressed gas is introduced into a second cavity and a third cavity, turbulence is easy to generate, the longitudinal stability and the transverse uniformity of the outlet gas flow are poor, the time domain fluctuation of the lip outlet wind speed is larger, and the outlet wind speed is uneven.
In the development process of the invention, the air knife 10 is mentioned, fig. 2 is a schematic structural diagram of the air knife 10 in the prior art, the air knife 10 is a plurality of chambers communicated with the lower die of the air knife, each chamber is in a regular shape, fig. 3 is a schematic air flow diagram of the air knife 10 in the prior art, as can be seen from fig. 3, the last chamber on the lower die of the air knife has swirl, the air flow of the first chamber is uneven, the air flow at the lip of the air knife has swirl, and the longitudinal stability and the transverse uniformity of the air flow are poor.
On the basis of the first air knife 10, a developer designs the second air knife 20, fig. 4 is a schematic diagram of the structure of the second air knife 20 in the prior art, the invention improves the shape of the cavity based on the first air knife 10, the number of the cavity is reduced to 2, fig. 5 is a schematic diagram of the gas flow direction of the second air knife 20, as can be seen from fig. 5, the longitudinal stability and the transverse uniformity of the gas flow at the outlet of the second air knife 20 are poor, the time domain fluctuation of the air speed at the lip outlet is large, and the first air knife 10 and the second air knife 20 can not meet the requirement of perovskite coating liquid on the air flow sprayed by the air knife.
According to the air knife, namely, an air knife three 30 is improved through continuous efforts of researchers, as shown in fig. 6-13, the air knife three 30 comprises a lower die 1, an upper die 2 and a gasket 3, the gasket 3 is positioned between the lower die 1 and the upper die 2, at least one gas inlet channel 13 for accessing gas is arranged on the lower die 1, a plurality of distribution cavities communicated with each other are sequentially arranged along the gas flow direction, the distribution cavity positioned at the most upstream of the gas flow direction is communicated with the gas inlet channel 13, the longitudinal heights of the distribution cavities are gradually decreased from the upstream to the downstream of the gas flow, a serpentine flow path can be formed in the distribution cavities, the serpentine flow path comprises a lower part, an upper part and a middle part, the upper part is positioned between the lower part and the middle part, the highest point of the lower part is the same as the highest point of the middle part and is the lowest point of the upper part, the height difference of the lowest point of the lower part is H, the height difference of the lowest point of the lower part is 8-12 mm compared with the lowest point of the middle part, as shown in fig. 12, the curve S 1 is a flow path, the curve S 1 is the highest point of the upper part and the highest point of the lower part is the highest point of the upper part, the lower point of the lower part and the upper part is the highest point of the upper part. A lip 4 is formed between the lower die 1 and the upper die 2, the lip 4 is positioned at the tail end of the gas flow, and the distribution cavity positioned at the most downstream of the gas flow direction is communicated with the lip 4.
The volume of the distribution cavities decreases along the gas flow direction, the volume of the distribution cavities decreases gradually to increase the gas flow velocity in the air knife III 30, and the corners of the distribution cavities are provided with arc chamfers, so that the problem of inconsistent gas flow directions in the cavity of the air knife I10 is avoided.
As shown in fig. 7, 8 and 9, at least three distribution chambers are provided, wherein the three distribution chambers are a first distribution chamber 11, a second distribution chamber 21 and a third distribution chamber 12, the first distribution chamber 11 is communicated with the gas inlet channel 13, the third distribution chamber 12 is communicated with the lip 4, the second distribution chamber 21 is positioned between the first distribution chamber 11 and the third distribution chamber 12, and a choke flow passage 5 is arranged between the lip 4 and the third distribution chamber 12. The first distribution chamber 11, the second distribution chamber 21 and the third distribution chamber 12 are sequentially communicated, and the gas is blown out from the lip 4 after sequentially passing through the gas inlet channel 13, the first distribution chamber 11, the second distribution chamber 21, the third distribution chamber 12 and the choke flow passage 5. A serpentine flow path is formed in the first, second and third distribution chambers 11, 21 and 12, a lower portion of the serpentine flow path being located in the first distribution chamber 11, an upper portion of the serpentine flow path being located in the second distribution chamber 21, and a middle portion of the serpentine flow path being located in the third distribution chamber 12.
The serpentine flow path is formed based on the structural design of the first, second and third distribution chambers 11, 21 and 12, including the longitudinal height, width and circular arc chamfer in the chambers of the first, second and third distribution chambers 11, 21 and 12. As shown in fig. 9, the longitudinal height of the first distribution chamber 11 is H 1, the longitudinal height of the second distribution chamber 21 is H 2, the longitudinal height of the third distribution chamber 12 is H 3, the height H 1 of the first distribution chamber 11 is 1.5 to 2.5 times, preferably H 1 is 2 times, H 2 of the height H 2 of the second distribution chamber 21, and the height H 2 of the second distribution chamber 21 is 1.5 to 2.5 times, preferably H 2 is 2 times, H 3 of the height H 3 of the third distribution chamber 12. The width of the first distribution chamber 11 is b, the width of the second distribution chamber 21 is c, the width of the third distribution chamber 12 is d, wherein b is 1-1.5 times of c, preferably b is equal to c, c is 1-1.5 times of d, preferably c is equal to d. The design of the longitudinal height and the width ensures that the gas can be transversely and uniformly distributed in the first distribution cavity 11 and the second distribution cavity 21, and is converted into laminar flow at the third distribution cavity 12 and the flow blocking flow channel 5 until the lip 4 is sprayed out, so that stable outflow is realized by the laminar flow, and better transverse uniformity of flow velocity and stable spraying in time domain are obtained.
The longitudinal height of the flow blocking flow channel 5 is 0.05-0.25 mm, and the top of the flow blocking flow channel 5 is flush with the top of the third distribution cavity 12. The design is such that the flow-blocking runner 5 exerts frictional resistance to the fluid through the lower surface of the upper die 2 and the upper surface of the lower die 1, thereby causing the fluid to "clog" at the flow-blocking runner 5, causing the fluid lateral distribution process to occur at the first distribution chamber 11, the second distribution chamber 21, and the third distribution chamber 12. The choke flow channel 5 can obtain a better transverse distribution effect by adopting a proper longitudinal height, and the preferable longitudinal height is 0.05mm.
The length of the gas inlet channel 13 in the gas flow direction is 1 to 2 times the width of the first distribution chamber 11, the length of the gas inlet channel 13 in the gas flow direction is a, a is 1 to 2 times the length of b in fig. 9, and the length of the choke flow channel 5 in the gas flow direction is e, e is 1 to 2 times the width b of the first distribution chamber 11. The width design is such that the flow-blocking runner 5 exerts frictional resistance to the fluid through the lower surface of the upper die 2 and the upper surface of the lower die 1, thereby causing the fluid to "clog" at the flow-blocking runner 5, causing the fluid lateral distribution process to occur at the first distribution chamber 11, the second distribution chamber 21, and the third distribution chamber 12. A suitable value of e gives a good lateral distribution, the preferred length e of the flow-blocking flow channel 5 in the direction of gas flow being 1.33 times the width b of the first distribution chamber 11.
Also shown in fig. 9 are circular arc chamfers provided at corners of the respective distribution chambers, the first distribution chamber 11 includes a first circular arc 61 and a second circular arc 62, a third circular arc 63 and a fourth circular arc 64 are provided at a junction of the first distribution chamber 11 and the second distribution chamber 21, the second distribution chamber 21 includes a fifth circular arc 65 and a sixth circular arc 66, a seventh circular arc 67 and an eighth circular arc 68 are provided at a junction of the second distribution chamber 21 and the third distribution chamber 12, a ninth circular arc 69 and a tenth circular arc 610 are provided at the third distribution chamber 12, and an eleventh circular arc 611 is provided at a junction of the third distribution chamber 12 and the flow blocking flow passage 5. The radius of the first arc 61, the second arc 62, the third arc 63, the fourth arc 64, the fifth arc 65, the sixth arc 66, the seventh arc 67, the eighth arc 68, the ninth arc 69, the tenth arc 610 and the eleventh arc 611 is equal to half of H 3, namely half of the longitudinal height of the third distribution chamber 12, and the central angles of the first arc 61, the second arc 62, the third arc 63, the fourth arc 64, the fifth arc 65, the sixth arc 66, the seventh arc 67, the eighth arc 68, the ninth arc 69, the tenth arc 610 and the eleventh arc 611 are 90 degrees. The addition of circular arc angles in the first distribution chamber 11, the second distribution chamber 21 and the third distribution chamber 12 can form a smooth serpentine flow path, and the formation of vortex or turbulence of the gas at right angles is avoided, so that the generation of unstable flow velocity in the time domain is avoided.
The air knife three 30 comprises an upper die 2, a gasket 3 and a lower die 1, a first distribution cavity 11, a second distribution cavity 21 and a third distribution cavity 12 are arranged between the lower die 1 and the upper die 2, the first distribution cavity 11 and the third distribution cavity 12 are arranged on the lower die 1 at intervals, and the second distribution cavity 21 is arranged on the upper die 2 and is communicated with the first distribution cavity 11 and the third distribution cavity 12. the width of the first distribution chamber 11, the width of the second distribution chamber 21 and the width of the third distribution chamber 12 are the same, the first distribution chamber 11, The longitudinal height of the second distribution chamber 21 and the third distribution chamber 12 decreases by a factor of 0.5, i.e. the height H 1 of the first distribution chamber 11 is 2 times the height H 2 of the second distribution chamber 21 and the height H 2 of the second distribution chamber 21 is 2 times the height H 3 of the third distribution chamber 12. The lower die 1 is provided with a gas inlet channel 13, a first distribution cavity 11 and a third distribution cavity 12, the upper die 2 is provided with a second distribution cavity 21, the first distribution cavity 11, the second distribution cavity 21 and the third distribution cavity 12 are all obtained by transverse sweeping and cutting of round rectangular sections, the upper die 2, the gasket 3 and the lower die 1 are fixedly connected through bolts, the double-row bolt structure has better rigidity, and the double-row bolt structure is matched with a serpentine flow path to achieve better performance of the air knife. The gasket 3 is positioned between the upper die 2 and the lower die 1, and forms a slit flow blocking runner 5, the tail end of the flow blocking runner 5 is provided with a lip 4, the thinner or longer the flow blocking runner 5 is, the larger the pressure drop is, the better the transverse uniformity of the flow velocity of the sprayed gas is, in the embodiment, the longitudinal height of the flow blocking runner 5 is 0.05mm, and the lower die 1 is connected with a fixed base of the coating machine. Fig. 10 is a three-dimensional rendering diagram of a distribution chamber according to the present invention, and fig. 10 shows that the air flow passage in the air knife three 30 according to the present invention has a serpentine path, and the cross-sectional area of the flow passage decreases step by step. Fig. 11 is a graph showing the effect of the flow of gas in the distribution chamber according to the present invention, and it can be seen from fig. 11 that the gas forms a serpentine flow at the first distribution chamber 11, the second distribution chamber 21 and the third distribution chamber 12. Fig. 12 is a schematic gas flow direction diagram of the die of the present invention, and it is understood from fig. 12 that the gas forms a serpentine flow at the first distribution chamber 11, the second distribution chamber 21, and the third distribution chamber 12, and forms a jet flow at the lip 4, and the flow rate at the center of the stream is much greater than 40m/s. Fig. 13 is a top view of the gas flow direction of the die in fig. 12, and it is understood from fig. 13 that the gas is mainly laterally distributed at the first distribution chamber 11 and the second distribution chamber 21, and is laterally distributed at the third distribution chamber 12, there is no apparent lateral distribution behavior at the flow-blocking flow passage 5, and the flow velocity lateral uniformity after the gas is ejected from the lip 4 is good. The depths of the first distribution cavity 11, the second distribution cavity 21 and the third distribution cavity 12 of the air knife III 30 are gradually decreased, the flow speed is gradually increased, the first distribution cavity 11, the second distribution cavity 21 and the third distribution cavity 12 form a snake-shaped flow path together, compared with the flow paths of the air knife I10 and the air knife II 20 in the prior art, the snake-shaped flow path is easy to form laminar flow, turbulence (vortex and whirl) is greatly reduced, the time domain fluctuation of the wind speed sprayed by lips is smaller, and the pressure drop difference of each path in transverse distribution can be reduced and the uniformity of the wind speed of an outlet can be remarkably improved through the size collocation of circular arc chamfers of the first distribution cavity 11, the second distribution cavity 21, the third distribution cavity 12, the choke runner 5 and each cavity.
Fig. 14 shows test data of three air knives, and fig. 14 shows that the outlet flow velocity of the air knife three 30 is transversely uniform better than that of the air knife one 10 and the air knife two 20, and the air knife three 30 still has good effect at the position 3cm from the lip 4.
FIG. 15 is a graph of the test results of the air knife 10 at 1cm lip, and the graph in FIG. 15 illustrates that the outlet flow velocity of the air knife 10 has poor lateral uniformity.
Fig. 16 is a graph of test results of the air knife two 20 at 1cm lip, and the graph in fig. 16 illustrates that the outlet flow velocity of the air knife two 20 has poor lateral uniformity.
FIG. 17 is a graph of the test results of air knife three 30 at 1cm lip, and the graph in FIG. 17 shows that the outlet flow velocity of air knife three 30 has better lateral uniformity.
Fig. 18 is a graph of the test results of air knife three 30 at 3cm lip, and the graph in fig. 18 shows that the outlet flow velocity of air knife three 30 has better lateral uniformity and better uniformity than air knife three 30 at 1cm, and that air knife three 30 has better uniformity at 3cm lip than air knife three 30 at 1cm lip.
Through tests, the structures of the air knife III 30 in the invention are completely in accordance with the process requirements of drying perovskite coating liquid, the second distribution cavity 21 is arranged on the upper die 2, and the gas flows in the second distribution cavity 21 and the third distribution cavity 12 are laminar flows through the shape and size matching of the first distribution cavity 11, the second distribution cavity 21 and the third distribution cavity 12, so that the longitudinal stability and the transverse uniformity of the outlet gas flow are improved. The outlet gas flow has good longitudinal stability and lateral uniformity, which can be better than 97%. The gas passes through the first distribution cavity 11, the second distribution cavity 21 and the third distribution cavity 12 to form a serpentine flow path, the structural design of the first distribution cavity 11, the second distribution cavity 21 and the third distribution cavity 12 is easy to form laminar flow, the laminar flow is orderly and stable, otherwise, the turbulent flow is disordered and fluctuates, the laminar flow is favorable for improving the longitudinal stability, a foundation is provided for improving the transverse consistency, and the transverse and longitudinal consistency improvement is realized through the collocation of the first distribution cavity 11, the second distribution cavity 21 and the third distribution cavity 12.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511222619.1A CN120720848B (en) | 2025-08-29 | 2025-08-29 | A type of wind blade |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511222619.1A CN120720848B (en) | 2025-08-29 | 2025-08-29 | A type of wind blade |
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| CN120720848A true CN120720848A (en) | 2025-09-30 |
| CN120720848B CN120720848B (en) | 2025-11-04 |
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2025
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| TW201215463A (en) * | 2010-10-13 | 2012-04-16 | Suntouch Technology Co Ltd | Liquid stripping device and method for surface of substrate |
| CN207073998U (en) * | 2017-06-15 | 2018-03-06 | 上海杰伟机械制造有限公司 | Air knife structure |
| CN209993624U (en) * | 2019-07-25 | 2020-01-24 | 苏州盟萤电子科技有限公司 | Air knife for improving airflow stability |
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| CN120720848B (en) | 2025-11-04 |
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