Air knife and eyeglass cleaning device comprising same

Abstract

The application discloses a kind of air knife and including its glasses cleaning device, belong to glasses cleaning equipment technical field.The air knife of the application is used for the air drying of frame glasses, including air inlet part, hollow pipeline and air outlet part;Air inlet part one end is connected with the air source outside, other end is communicated with the one end of the hollow pipeline;The other end of hollow pipeline is communicated with air outlet part;The airflow output by air source enters hollow pipeline from air inlet part, and is guided by air outlet part, and sends obliquely downward airflow to frame glasses;Air outlet part is provided with a plurality of guide plates, and different air outlet areas are formed, and the airflow output by each air outlet area is sent to different parts of frame glasses.The application can quickly air dry water droplets on the surface of frame glasses.

Description

Technical Field

[0001] This invention belongs to the technical field of eyeglass cleaning equipment, specifically relating to an air knife and an eyeglass cleaning device including the air knife. Background Technology

[0002] Eyeglasses typically consist of lenses, frames, bridge, nose pads, temples, and other main components, and are categorized into three types: full-rimmed, semi-rimless, and rimless. Eyeglasses generally need to be cleaned every one or two days to ensure clear vision and maintain a clean and fresh appearance. Current ultrasonic eyeglass cleaning machines require adding a cleaning solution to the tank before placing the eyeglasses in. After the ultrasonic cleaning, the glasses are removed by hand, resulting in wet hands and glasses that need to be dried repeatedly – ​​a rather cumbersome process. With technological advancements, automated eyeglass cleaning machines will move from the laboratory into everyday life, providing a convenient and hands-free cleaning experience.

[0003] To address the above pain points, extensive research and development work on automated eyeglass cleaning machines has been carried out both domestically and internationally. During the process of drying the eyeglasses after cleaning, the inventors discovered that existing technologies have at least the following problems: Using a hair dryer to dry the eyeglasses results in a single, round nozzle that blows a concentrated airflow that is strong in the center and weaker around the edges. Larger water droplets adhering to the eyeglass surface are blown away by this airflow, causing them to scatter and break into smaller pieces. The hair dryer needs to repeatedly follow the water droplets in all directions to dry them, resulting in a slow drying speed. Summary of the Invention

[0004] The purpose of this invention is to provide an air knife and an eyeglass cleaning device including the air knife, which can quickly dry water droplets on the surface of eyeglass frames.

[0005] Specifically, on the one hand, the present invention provides an air knife for air drying eyeglasses, the air knife comprising an air inlet, a hollow duct and an air outlet;

[0006] One end of the air inlet is connected to an external air source, and the other end is connected to one end of the hollow duct.

[0007] The other end of the hollow duct is connected to the air outlet; the airflow output from the air source enters the hollow duct from the air inlet, is guided by the air outlet, and is sent out at an angle downward to the eyeglasses.

[0008] The air outlet is equipped with several guide vanes to form different air outlet zones, and the airflow output from each air outlet zone is delivered to different parts of the eyeglasses frame.

[0009] Furthermore, the air inlet is a tubular structure; the cross-section of the hollow duct is circular or elliptical; the air outlet includes an upper plate, a side plate, and a lower plate, forming an enclosed structure that communicates with the hollow duct; the upper plate, side plate, and lower plate respectively form a set angle with the axial direction of the hollow duct and are tangent to the wall of the hollow duct.

[0010] Furthermore, the air inlet is perpendicular to the cross-section of the hollow duct.

[0011] Furthermore, the upper plate is a flat plate, and the lower plate is a flat plate or a curved plate.

[0012] Furthermore, the height of the air outlet is 1.6-4.5 times the inner diameter of the hollow duct, and the inner diameter of the hollow duct is 1-2.3 times the width of the air outlet.

[0013] Furthermore, when the plurality of guide plates are projected along the axial direction of the hollow pipe, the horizontal projection lines at the ends of the hollow pipe are sequentially distributed between the horizontal projection line positions of the upper plate and the lower plate.

[0014] Furthermore, the air outlet is provided with a strong air outlet zone, the cross-sectional area of ​​the airflow inlet of the strong air outlet zone is larger than the cross-sectional area of ​​the airflow outlet; the air outlet is provided with a weak air outlet zone and / or a secondary strong air outlet zone, the cross-sectional area of ​​the airflow inlet of the weak air outlet zone and / or the secondary strong air outlet zone is smaller than the cross-sectional area of ​​the airflow outlet.

[0015] Furthermore, there are four air deflectors, arranged sequentially from the upper plate to the lower plate as a first air deflector, a second air deflector, a third air deflector, and a fourth air deflector; five air outlet zones are formed between the upper plate, each air deflector, and the lower plate, arranged sequentially as a first air outlet zone, a second air outlet zone, a third air outlet zone, a fourth air outlet zone, and a fifth air outlet zone; wherein, the airflow output from the first air outlet zone covers the upper edge of the frame of the eyeglasses, the airflow output from the second air outlet zone covers the upper part of the lens surface and the temples of the eyeglasses, the airflow output from the third air outlet zone covers the middle part of the lens surface, the airflow output from the fourth air outlet zone covers the lower part of the lens surface or the lower edge of the eyeglasses (when the lens of the eyeglasses is small), and the airflow output from the fifth air outlet zone covers the bottom edge of the eyeglasses.

[0016] Furthermore, the second and fourth air outlet zones are enhanced air outlet zones, the first air outlet zone is a secondary enhanced air outlet zone relative to the second air outlet zone, the third air outlet zone is a medium air outlet zone, and the fifth air outlet zone is a secondary enhanced air outlet zone relative to the fourth air outlet zone.

[0017] Furthermore, the first guide plate, the second guide plate, the third guide plate and the fourth guide plate extend from the air outlet into the hollow duct and are located on different vertical surfaces of the end face where the air outlet of each air outlet zone is located;

[0018] When the first guide plate is projected along the axial direction of the hollow pipe, the horizontal projection line of the end inside the hollow pipe is located within the range of 1 / 15-2 / 15 of the inner diameter of the hollow pipe cross-section, and the angle between the side vertical plane where the first guide plate is located and the central axis of the hollow pipe is 20°-35°.

[0019] When the second guide plate is projected along the axial direction of the hollow pipe, the horizontal projection line of the end inside the hollow pipe is located within the range of 5 / 15-7 / 15 of the inner diameter of the hollow pipe cross-section. The angle between the side vertical plane where the second guide plate is located and the central axis of the hollow pipe is 40°-60°.

[0020] When the third guide plate is projected along the axial direction of the hollow pipe, the horizontal projection line of the end inside the hollow pipe is located within the range of 8 / 15-10 / 15 of the inner diameter of the hollow pipe cross-section. The angle between the side vertical plane where the third guide plate is located and the central axis of the hollow pipe is 20°-35°.

[0021] When the fourth guide plate is projected along the axial direction of the hollow pipe, the horizontal projection line of the end inside the hollow pipe is located within the range of 13 / 15-14 / 15 of the inner diameter of the hollow pipe cross-section. The angle between the side vertical plane where the fourth guide plate is located and the central axis of the hollow pipe is 40°-60°.

[0022] Furthermore, the inner diameter of the hollow pipe is 21-58 mm.

[0023] Furthermore, the upper plate and the lower plate are located on different vertical planes of the hollow pipe. The angle between the vertical plane of the upper plate and the axial direction of the hollow pipe is 35°-55°; the angle between the vertical plane of the lower plate and the axial direction of the hollow pipe is 35°-60°.

[0024] Furthermore, the first and second guide vanes tend to converge from the inside out along the air outlet direction; the third and fourth guide vanes tend to converge from the inside out along the air outlet direction; the minimum distance between the first and second guide vanes is 3-17mm, and the minimum distance between the third and fourth guide vanes is 3-17mm.

[0025] Furthermore, a plurality of sub-guide plates are provided in the air outlet area, and the angle between the plurality of sub-guide plates and the end face where the air outlet is located is between the angle between the upper and lower plates of the air outlet area where the plurality of sub-guide plates are located and the end face where the air outlet is located.

[0026] On the other hand, the present invention also provides an eyeglass cleaning device, including an air source and at least one of the above-mentioned air knives.

[0027] The beneficial effects of the air knife and the eyeglass cleaning device including the present invention are as follows:

[0028] By setting up several deflectors, the air outlet is divided into air outlet zones with different airflow intensities. The resulting downward airflow covers water droplets at different locations on the surface of the eyeglasses lenses and temples. This causes the water droplets to move in a direction roughly in line with the direction of gravity, moving downwards. During this movement, the water droplets are propelled by the enhanced airflow in the air outlet zone, making it easy for water droplets of all sizes to gather at the bottom of the frame or temples and be blown off. This eliminates the need for repeated drying, resulting in fast drying speeds and saving drying time.

[0029] By placing the eyeglasses diagonally below the air knife, the airflow from the air knife outlet can avoid being blocked by the eyeglass frames and cover the surface of the eyeglasses, resulting in a fast drying speed.

[0030] By setting the cross-sectional areas of the airflow inlets and outlets of each air outlet zone, the airflow intensity output by different zones can be varied. Adjusting the airflow intensity of the corresponding air outlet zone based on the drying airflow requirements of different parts of the eyeglasses frame can achieve better drying results. Setting an enhanced air outlet zone generates strong thrust by increasing the airflow speed, preventing water droplets on the lens surface from flowing upwards. Larger droplets move downwards along the lens surface and converge, while smaller droplets are dried quickly, resulting in faster drying and saving drying time.

[0031] By setting several sub-guide plates in each air outlet zone, the angle between the sub-guide plates and the end face where the air outlet is located is between the angle between the upper and lower plates of the air outlet zone and the end face where the air outlet is located, making the air outlet of each air outlet zone more uniform and the drying effect better. Attached Figure Description

[0032] Figure 1 This is a perspective view of the air knife according to an embodiment of the present invention.

[0033] Figure 2 This is a top view of the air knife according to an embodiment of the present invention.

[0034] Figure 3 yes Figure 2 Sectional view of section AA.

[0035] The diagram is labeled as follows: 1-Air inlet, 11-Fixing part, 111-Sleeve opening, 112-Threaded opening, 2-Hollow duct, 3-Air outlet, 31-Upper plate, 32-Side plate, 33-Lower plate, 34-Guide plate, 341-First guide plate, 342-Second guide plate, 343-Third guide plate, 344-Fourth guide plate, 35-Air outlet area, 351-First air outlet area, 352-Second air outlet area, 353-Third air outlet area, 354-Fourth air outlet area, 355-Fifth air outlet area. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the embodiments and the accompanying drawings.

[0037] Example 1:

[0038] One embodiment of the present invention is an air knife, such as... Figures 1 to 3 As shown. The air knife in this embodiment includes an air inlet, a hollow duct, and an air outlet. One end of the air inlet is connected to an external air source (not shown), and the other end is connected to one end of the hollow duct. The other end of the hollow duct is connected to the air outlet. The airflow output from the air source enters the hollow duct through the air inlet, is guided by the air outlet, and is delivered obliquely downward to the eyeglasses to be dried. This airflow can cover the water droplets on the surface of the eyeglass lenses and temples, so that the water droplets move in a direction roughly in line with the direction of gravity, that is, downward. During the movement, the water droplets are propelled by the airflow, and the water droplets easily gather to the bottom of the frame or temples and are blown off, without moving up and down back and forth, resulting in fast drying speed and saving drying time. In addition, the eyeglasses are placed obliquely below the air knife, so the airflow can avoid the obstruction of the eyeglass frame and cover the surface of the eyeglasses, resulting in fast drying speed.

[0039] The air outlet section is equipped with several guide vanes, forming different air outlet zones. The airflow output from each air outlet zone is delivered to different parts of the eyeglasses frame. For example, when four guide vanes are used in the air outlet section, from the upper plate to the lower plate, they are the first guide vane, the second guide vane, the third guide vane, and the fourth guide vane. The air outlet zones formed between the upper plate, each guide vane, and the lower plate are the first air outlet zone, the second air outlet zone, the third air outlet zone, the fourth air outlet zone, and the fifth air outlet zone, respectively.

[0040] Preferably, the air inlet is a tubular structure with a circular or elliptical cross-section. The air outlet includes an upper plate, side plates, and a lower plate, forming an enclosing structure that communicates with the hollow pipe. The upper plate, side plates, and lower plate each form a predetermined angle with the axial direction of the hollow pipe and are tangent to the pipe wall. This allows the upper and lower plates to guide the airflow flowing into the air inlet through the hollow pipe, directing the airflow towards the surface of the eyeglasses in a direction roughly consistent with the direction of gravity, which facilitates the downward movement of water droplets.

[0041] The air inlet is perpendicular to the cross-section of the hollow duct, allowing the airflow from the air source to pass through the hollow duct with maximum efficiency. The air inlet and the hollow duct can be formed integrally; alternatively, the air inlet can be a separate component attached to the hollow duct.

[0042] Preferably, both the upper and lower plates are flat. By setting the upper and lower plates to form a suitable angle with the axial direction of the hollow duct, the direction of the airflow output from the outlet can be easily controlled. It is understood that the lower plate can also be an arc-shaped plate.

[0043] Preferably, the height of the air outlet is 1.6-4.5 times the inner diameter of the hollow duct, and the inner diameter of the hollow duct is 1-2.3 times the width of the air outlet. The greater height of the air outlet allows the airflow to cover eyeglasses of various lens heights; while the smaller width of the air outlet than the inner diameter of the hollow duct ensures that the air velocity at the outlet is sufficient to meet the drying requirements.

[0044] Preferably, when each guide plate is projected along the axial direction of the hollow pipe, the horizontal projection line positions at the ends of the hollow pipe are sequentially distributed between the horizontal projection line positions of the upper plate and the lower plate, so that the airflow in different air outlet areas entering the air outlet in the hollow pipe is relatively uniform, thereby making the airflow output from each air outlet area to different parts of the eyeglasses relatively balanced.

[0045] Extensive research and experimentation have shown that guiding the airflow and altering its intensity and distribution to direct high-momentum airflow in a designated direction to a specific area on the surface of eyeglasses covered with water droplets facilitates rapid drying. Preferably, by setting the cross-sectional areas of the airflow inlet and outlet of each air outlet zone, the airflow intensity output by different zones can be varied. For example, setting the cross-sectional area of ​​the airflow inlet of an outlet zone to be larger than that of the airflow outlet results in a stronger output airflow compared to the input airflow, creating a strong airflow zone; setting the cross-sectional area of ​​the airflow inlet to be smaller than that of the airflow outlet results in a weaker output airflow compared to the input airflow, creating a relatively weak airflow zone, such as a moderately strong airflow zone or a weaker medium airflow zone. By adjusting the airflow intensity of the corresponding air outlet zone according to the drying airflow requirements of different parts of the eyeglasses to be dried, a better drying effect can be achieved.

[0046] Preferably, several sub-guide vanes can be installed in each air outlet zone. The angle between the sub-guide vanes and the end face where the air outlet is located is between the angle between the upper and lower plates of the air outlet zone where the sub-guide vanes are located (for example, the upper plate and the first guide vane of the first air outlet zone, the first guide vane and the second guide vane of the second air outlet zone, and the last guide vane and the lower plate of the bottom air outlet zone) and the end face where the air outlet is located, so that the air outlet in each air outlet zone is more uniform and the drying effect is better.

[0047] Preferably, the eyeglass cleaning device can employ at least one air knife of the present invention to dry the inner and outer surfaces of the eyeglasses. When the at least one air knife is drying the inner and outer surfaces of the eyeglasses, the air outlets are not opposite each other to avoid mutual interference of airflow.

[0048] Example 2:

[0049] Another embodiment of the present invention is an air knife, which differs from Embodiment 1 in that it has four guide plates, arranged sequentially from the upper plate to the lower plate as a first guide plate, a second guide plate, a third guide plate, and a fourth guide plate. Five air outlet zones are formed between the upper plate, the guide plates, and the lower plate, sequentially named the first air outlet zone, the second air outlet zone, the third air outlet zone, the fourth air outlet zone, and the fifth air outlet zone. Specifically, the airflow from the first air outlet zone covers the upper edge of the eyeglass frame to be dried; the airflow from the second air outlet zone covers the upper surface of the eyeglass lens and the temples; the airflow from the third air outlet zone covers the middle of the eyeglass lens; the airflow from the fourth air outlet zone covers the lower part of the eyeglass lens or part of the lower edge of the eyeglass frame; and the airflow from the fifth air outlet zone covers the bottom edge of the eyeglass frame. The airflow from the outlet forms a downward-sloping airflow that covers water droplets at different locations on the surface of the eyeglass lens and temples, causing the water droplets to move in a direction roughly consistent with the direction of gravity, moving downwards, resulting in rapid drying.

[0050] Preferably, the second and fourth air outlet zones are enhanced air outlet zones, the first air outlet zone is a secondary enhanced air outlet zone relative to the second air outlet zone, the fifth air outlet zone is a secondary enhanced air outlet zone relative to the fourth air outlet zone, and the third air outlet zone is a medium air outlet zone. During movement, water droplets are propelled by the airflow from the two enhanced air outlet zones, and water droplets of various sizes easily gather at the bottom of the frame or temples and are blown off, eliminating the need for back-and-forth movement, resulting in fast drying and saving drying time.

[0051] The first air outlet zone delivers a secondary strong airflow that covers the upper edge of the frame. This secondary strong airflow propels larger water droplets along the frame to the lens surface, while simultaneously drying smaller water droplets. Furthermore, considering the varying heights of the glasses, the divergent airflow pattern created by this outlet zone can cover a wide area, ensuring effective drying.

[0052] The second air outlet area delivers an enhanced airflow that is slightly downward-sloping relative to the first air outlet area, covering the lens surface. This enhanced airflow generates strong thrust through its increased speed, propelling larger water droplets on the upper part of the lens surface downwards at an accelerated pace, while simultaneously drying smaller water droplets. Furthermore, since the temples of eyeglasses are generally at this height, and eyeglasses have relatively short temples, this enhanced airflow can effectively blow water droplets off and dry their surfaces.

[0053] The third air outlet provides a moderately strong airflow that slopes downwards compared to the second air outlet. The airflow speed is relatively lower, providing a continuous thrust to larger water droplets moving downwards from the top and middle of the lens, allowing the larger water droplets to continue moving downwards while the smaller water droplets are dried.

[0054] The fourth air outlet zone delivers enhanced airflow to cover the lower part of the lens and part of the lower edge of the eyeglasses. Since the air outlet is relatively far from the lower part of the lens, or where the lower edge of some eyeglasses is raised, covering this area with an enhanced air outlet zone can increase the wind speed and generate strong thrust to move the water droplets under the lens to the bottom edge of the eyeglasses.

[0055] The fifth air outlet zone outputs a secondary strong airflow that covers the water droplets at the bottom edge of the glasses. The airflow generated in this air outlet zone will blow away the larger water droplets at the bottom edge of the glasses, while drying the smaller water droplets.

[0056] Preferably, the first and second guide vanes are not parallel and tend to converge from the inside out along the air outlet direction; the third and fourth guide vanes are not parallel and tend to converge from the inside out along the air outlet direction, such as... Figure 3 As shown.

[0057] Example 3:

[0058] Another embodiment of the present invention is an air knife and eyeglass cleaning device, which differs from Embodiment 2 in that the first, second, third, and fourth guide plates extend from the air outlet into the hollow duct and are located on different lateral faces of the end face where the air outlet is located. When projected along the axial direction of the hollow duct, the horizontal projection line of the end of the first guide plate inside the hollow duct is located within 1 / 15 to 2 / 15 of the inner diameter of the hollow duct cross-section, and the angle α between the lateral face of the first guide plate and the central axis of the hollow duct is 20°-35°; the horizontal projection line of the end of the second guide plate inside the hollow duct is located within 5 / 15 to 7 / 15 of the inner diameter of the hollow duct cross-section, and the angle β between the lateral face of the second guide plate and the central axis of the hollow duct is 40°- 60°; The horizontal projection line of the end of the third guide plate inside the hollow pipe is located within the range of 8 / 15-10 / 15 of the inner diameter of the hollow pipe cross-section, and the angle γ between the side vertical plane where the third guide plate is located and the central axis of the hollow pipe is 20°-35°; The horizontal projection line of the end of the fourth guide plate inside the hollow pipe is located within the range of 13 / 15-14 / 15 of the inner diameter of the hollow pipe cross-section, and the angle δ between the side vertical plane where the fourth guide plate is located and the central axis of the hollow pipe is 40°-60°.

[0059] Preferably, the inner diameter of the hollow duct is 21-58mm, which allows the airflow velocity of the air knife output to meet the drying requirements of various types of eyeglasses.

[0060] Preferably, the upper and lower air outlet plates are located on different vertical surfaces of the hollow duct, with the angle between the vertical surface of the upper plate and the axis of the hollow duct being 35°-55°, and the angle between the vertical surface of the lower plate and the axis of the hollow duct being 35°-60°. This arrangement of the upper and lower plates guides the airflow to the surface of the eyeglasses in a direction roughly consistent with the direction of gravity, which is beneficial for water droplets to move downwards.

[0061] The first and second guide vanes are not parallel, and tend to converge from the inside out along the air outlet direction. The minimum distance between the first and second guide vanes is 3-17mm to ensure that the airflow output in the second air outlet area is strong enough to accelerate the drying speed. The third and fourth guide vanes are also not parallel, and tend to converge from the inside out along the air outlet direction. The minimum distance between the third and fourth guide vanes is 3-17mm to ensure that the airflow output in the fourth air outlet area is strong enough to accelerate the drying speed.

[0062] When in use, the air knife of this invention creates air outlet zones with different airflow intensities by setting several guide plates. This generates a downward-sloping airflow that covers water droplets at different locations on the surface of the eyeglasses lens and temples. The water droplets move in a direction roughly in line with the direction of gravity, moving downwards. During this movement, the water droplets are propelled by the enhanced airflow in the air outlet zone, and water droplets of all sizes easily gather at the bottom of the frame or temples and are blown off without needing to move back and forth. This results in fast drying and saves drying time.

[0063] By placing the eyeglasses diagonally below the air knife, the airflow from the air knife can bypass the frame of the eyeglasses and cover the surface of the eyeglasses, resulting in a fast drying speed.

[0064] By setting the cross-sectional areas of the airflow inlets and outlets of each air outlet zone, the airflow intensity output by different zones can be varied. Adjusting the airflow intensity of the corresponding air outlet zone based on the drying airflow requirements of different parts of the eyeglasses frame can achieve better drying results. Setting an enhanced air outlet zone generates strong thrust by increasing the airflow speed, preventing water droplets on the lens surface from flowing upwards. Larger droplets move downwards along the lens surface and converge, while smaller droplets are dried quickly, resulting in faster drying and saving drying time.

[0065] Several sub-guide plates can be installed in each air outlet zone. In each air outlet zone, the angle between the several sub-guide plates and the end face where the air outlet is located is between the angle between the upper and lower plates of the air outlet zone and the end face where the air outlet is located, so that the air outlet of each air outlet zone is more uniform and the drying effect is better.

[0066] While the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the invention. Any equivalent changes or modifications made without departing from the spirit and scope of the invention are also within the scope of protection of the invention. Therefore, the scope of protection of the present invention should be determined by the claims of this application.

Claims

1. An air knife for drying eyeglasses, characterized in that, The air knife includes an air inlet, a hollow duct, and an air outlet; One end of the air inlet is connected to an external air source, and the other end is connected to one end of the hollow duct. The other end of the hollow duct is connected to the air outlet; the airflow output from the air source enters the hollow duct from the air inlet, is guided by the air outlet, and is sent out at an angle downward to the eyeglasses. The air outlet section is provided with several guide plates to form various air outlet zones. The several guide plates are located on different side vertical surfaces of the end face where the air outlet of the air outlet zone is located. The angle between the side vertical surfaces where the several guide plates are located and the central axis of the hollow pipe is different, so that the output airflow intensity of each air outlet zone is different. Each air outlet zone includes a secondary strong air outlet zone, a strong air outlet zone, and a medium air outlet zone arranged in sequence.

2. The air knife according to claim 1, characterized in that, The air inlet is a tubular structure; the cross-section of the hollow duct is circular or elliptical; the air outlet includes an upper plate, a side plate, and a lower plate, forming an enclosed structure that communicates with the hollow duct; the upper plate, side plate, and lower plate form a set angle with the axial direction of the hollow duct and are tangent to the wall of the hollow duct.

3. The air knife according to claim 1, characterized in that, The air inlet is perpendicular to the cross-section of the hollow duct.

4. The air knife according to claim 2, characterized in that, The upper plate is a flat plate, and the lower plate is a flat plate or a curved plate.

5. The air knife according to claim 1, characterized in that, The height of the air outlet is 1.6-4.5 times the inner diameter of the hollow duct, and the inner diameter of the hollow duct is 1-2.3 times the width of the air outlet.

6. The air knife according to claim 2, characterized in that, When the guide plates are projected along the axial direction of the hollow pipe, the horizontal projection lines at the ends of the hollow pipe are sequentially distributed between the horizontal projection lines of the upper plate and the lower plate.

7. The air knife according to claim 2, characterized in that, The air outlet is provided with a strong air outlet zone, wherein the cross-sectional area of ​​the airflow inlet of the strong air outlet zone is larger than the cross-sectional area of ​​the airflow outlet; the air outlet is provided with a weak air outlet zone and / or a secondary strong air outlet zone, wherein the cross-sectional area of ​​the airflow inlet of the weak air outlet zone and / or the secondary strong air outlet zone is smaller than the cross-sectional area of ​​the airflow outlet.

8. The air knife according to claim 2, characterized in that, There are four air deflectors, arranged sequentially from the upper plate to the lower plate as the first air deflector, the second air deflector, the third air deflector, and the fourth air deflector. Five air outlet zones are formed between the upper plate, each air deflector, and the lower plate, arranged sequentially as the first air outlet zone, the second air outlet zone, the third air outlet zone, the fourth air outlet zone, and the fifth air outlet zone. The airflow from the first air outlet zone covers the upper edge of the frame of the eyeglasses, the airflow from the second air outlet zone covers the upper part of the lens surface and the temples of the eyeglasses, the airflow from the third air outlet zone covers the middle part of the lens surface, the airflow from the fourth air outlet zone covers the lower part of the lens surface or the lower edge of the eyeglasses, and the airflow from the fifth air outlet zone covers the bottom edge of the eyeglasses. The second and fourth air outlet zones are enhanced air outlet zones, the first air outlet zone is a secondary enhanced air outlet zone relative to the second air outlet zone, the fifth air outlet zone is a secondary enhanced air outlet zone relative to the fourth air outlet zone, and the third air outlet zone is a medium air outlet zone.

9. The air knife according to claim 8, characterized in that, The first guide plate, the second guide plate, the third guide plate and the fourth guide plate extend from the air outlet into the hollow duct and are located on different side vertical surfaces of the end face where the air outlet of each air outlet zone is located; When the first guide plate is projected along the axial direction of the hollow pipe, its horizontal projection line at the end inside the hollow pipe is located within the hollow pipe. Within the range of 1 / 15 to 2 / 15 of the inner diameter of the pipe cross-section, the angle between the vertical plane of the first guide plate and the central axis of the hollow pipe is 20° to 35°. When the second guide plate is projected along the axial direction of the hollow pipe, its horizontal projection line at the end inside the hollow pipe is located within the hollow pipe. Within the range of 5 / 15 to 7 / 15 of the inner diameter of the pipe cross-section, the angle between the vertical plane of the side where the second guide plate is located and the central axis of the hollow pipe is 40° to 60°. When the third guide plate is projected along the axial direction of the hollow pipe, its horizontal projection line at the end inside the hollow pipe is located within the hollow pipe. Within the range of 8 / 15 to 10 / 15 of the inner diameter of the pipe cross-section, the angle between the vertical plane of the third guide plate and the central axis of the hollow pipe is 20° to 35°. When the fourth guide plate is projected along the axial direction of the hollow pipe, its horizontal projection line at the end of the hollow pipe is located within the hollow pipe. Within the range of 13 / 15-14 / 15 of the inner diameter of the pipe cross-section, the angle between the vertical plane of the fourth guide plate and the central axis of the hollow pipe is 40°-60°.

10. The air knife according to claim 9, characterized in that, The inner diameter of the hollow pipe is 21-58mm.

11. The air knife according to claim 9, characterized in that, The upper plate and the lower plate are located on different vertical surfaces of the hollow pipe. The angle between the vertical surface of the upper plate and the axial direction of the hollow pipe is 35°-55°; the angle between the vertical surface of the lower plate and the axial direction of the hollow pipe is 35°-60°.

12. The air knife according to claim 9, characterized in that, The first and second guide vanes tend to converge from the inside out along the air outlet direction; the third and fourth guide vanes tend to converge from the inside out along the air outlet direction; the minimum distance between the first and second guide vanes is 3-17mm, and the minimum distance between the third and fourth guide vanes is 3-17mm.

13. The air knife according to claim 2, characterized in that, The air outlet area is provided with several sub-guide plates, and the angle between the several sub-guide plates and the end face where the air outlet is located is between the angle between the upper and lower plates of the air outlet area and the end face where the air outlet is located.

14. A glasses cleaning device, characterized in that, Includes an air source and at least one air knife according to any one of claims 1-13.

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