Dustproof sunshade assembly, image acquisition device and dustproof control method

Abstract

The application provides a dustproof sunshade assembly, an image acquisition device and a dustproof control method. The dustproof sunshade assembly comprises a first air curtain generating assembly and a second air curtain generating assembly. The first air curtain generating assembly is arranged between a lens of the image acquisition device and the second air curtain generating assembly to form a first air curtain. The second air curtain generating assembly sucks external air and blows out the external air through a second air outlet to form a second air curtain. Along the light entering direction of the lens, the second air curtain blocks at least part of the first air curtain to isolate the influence of external wind speed on the first air curtain. The air outlet direction of the first air curtain generating assembly is parallel to the air outlet direction of the second air outlet, and the air outlet direction of the first air curtain generating assembly is perpendicular to the light entering direction of the lens or has an included angle. The application can solve the problems of the existing air curtain generating device, such as limited wind disturbance resistance, insufficient dustproof ability in strong wind environment, inability to balance the relationship between windproof performance and energy consumption, and service life.

Description

Technical Field

[0001] This invention relates to the field of camera dustproof equipment technology, and more specifically, to a dustproof and sunshade component, an image acquisition device, and a dustproof control method. Background Technology

[0002] In the field of outdoor video equipment, the outer surface of camera lenses is easily affected by environmental dust, which leads to a decrease in image quality. To solve this problem, existing technologies generally employ an air curtain generator in front of the camera lens. This air curtain filters outside air to form a protective layer, isolating the lens from the outside environment and preventing external dust from directly contacting the lens surface. This air curtain device can effectively inhibit dust from adhering to the lens.

[0003] However, existing air curtain generating devices perform well when the protective air curtains generated are free from external wind disturbances, but once they encounter high-speed external wind disturbances, the air curtain structure will be damaged, and the protective effect will be greatly reduced. This is because the external wind force will directly act on the air curtain, causing the original air curtain fluid structure to become unstable, thus failing to effectively block dust. At the same time, in order to enhance the wind resistance of the air curtain, it is usually necessary to increase the air curtain flow rate, but this will accelerate the accumulation of dust in the filtration system used to filter the air curtain, seriously shortening the service life of the equipment and increasing energy consumption.

[0004] Therefore, existing air curtain generating devices for dust prevention on camera lens surfaces have limited wind resistance, insufficient dust prevention capabilities in strong wind environments, and fail to balance windproof performance with energy consumption and service life, which urgently need to be addressed. Summary of the Invention

[0005] This invention provides a dustproof and sunshade component, an image acquisition device, and a dust control method to at least solve one of the problems of existing air curtain generating devices: limited wind resistance, insufficient dust protection in strong wind environments, and failure to balance windproof performance with energy consumption and service life.

[0006] To address the aforementioned problems, according to one aspect of the present invention, a dustproof and sunshade assembly is provided, comprising: a first air curtain generating assembly and a second air curtain generating assembly. The first air curtain generating assembly is disposed between the lens of an image acquisition device and the second air curtain generating assembly. The first air curtain generating assembly filters external air to form a primary air curtain. Along the light-incoming direction of the lens, the primary air curtain blocks at least a portion of the lens to prevent dust from entering the lens. The second air curtain generating assembly draws in external air and blows it out through a secondary air outlet to form a secondary air curtain. Along the light-incoming direction of the lens, the secondary air curtain blocks at least a portion of the primary air curtain to isolate the influence of external airflow on the primary air curtain. The air outlet direction of the primary air curtain generating assembly is parallel to the air outlet direction of the secondary air outlet, and the air outlet direction of the primary air curtain generating assembly is perpendicular to or at an angle to the light-incoming direction of the lens.

[0007] Furthermore, the position of the secondary air outlet is adjustable; the size of the secondary air outlet is adjustable; wherein, the farthest end of the secondary air outlet along the light-incoming direction away from the lens is the first end, and the farthest end of the air outlet of the first air curtain generating component along the light-incoming direction away from the lens is the second end, the distance between the first end and the second end along the light-incoming direction of the lens is the air outlet spacing X2, and the air outlet spacing X2 is adjusted by adjusting the position of the secondary air outlet; the size of the secondary air outlet along the light-incoming direction of the lens is the air outlet width b, and the air outlet width b is adjusted by adjusting the size of the secondary air outlet.

[0008] Furthermore, the air outlet spacing X2 is greater than or equal to 2b; when the first end begins to block the field of view interference boundary of the lens, the value of the air outlet spacing X2 is a, and the air outlet spacing X2 is less than a; wherein, when the air outlet spacing X2 is equal to 2b, the air outlet velocity of the secondary air outlet is greater than or equal to 2.4 times the air outlet velocity of the first air curtain generating component.

[0009] Furthermore, the second air curtain generating assembly includes: a sunshade housing, an air outlet plate, an air outlet fan, a first driving structure, and a second driving structure; the secondary air outlet communicates with the interior of the sunshade housing and is located between the sunshade housing and the air outlet plate; the sunshade housing is movably disposed on the upper part of the first air curtain generating assembly or on the image acquisition device, and is drivenly connected to the first driving structure; the first driving structure is used to drive the sunshade housing to reciprocate parallel to the lens light-incoming direction to adjust the position of the secondary air outlet; the air outlet fan is disposed inside the sunshade housing and is used to draw in external gas and blow it out through the secondary air outlet to form a secondary air curtain; the air outlet plate is movably disposed on the sunshade housing and is drivenly connected to the second driving structure; the second driving structure is disposed on the sunshade housing and is used to drive the air outlet plate to reciprocate parallel to the lens light-incoming direction to adjust the size of the secondary air outlet.

[0010] Furthermore, the fan speed of the exhaust fan is adjustable to regulate the flow rate of the secondary air curtain; the outer periphery and inner wall of the part where the sunshade shell and the exhaust plate meet are both arc-shaped, with a radius of R on the outer periphery; the exhaust plate is an arc plate, which protrudes along the light-incoming direction away from the lens, and the curvature of the exhaust plate matches the inner wall of the part where the sunshade shell and the exhaust plate meet, so that the secondary air outlet is an arc-shaped air outlet; the exhaust plate covers the outer periphery of the air outlet of the first air curtain generating assembly; the air outlet direction of the secondary air outlet is perpendicular to the light-incoming direction of the lens.

[0011] Furthermore, the projection along the air outlet direction of the secondary air outlet onto the same plane perpendicular to the air outlet direction, the center of the arc of the outer periphery projection of the part where the sunshade shell and the air outlet plate meet, and the center of the arc of the inner wall projection of the part where the sunshade shell and the air outlet plate meet; the arcs of the outer periphery projection of the part where the sunshade shell and the air outlet plate meet, the arcs of the inner wall projection of the part where the sunshade shell and the air outlet plate meet, and the arcs of the air outlet plate projection are respectively set in parallel; wherein, the air outlet spacing X2 is less than or equal to R.

[0012] Furthermore, the first drive structure includes a first motor and a first transmission screw; the first transmission screw is connected to the first motor, and the first motor drives the first transmission screw to rotate; the external thread of the first transmission screw engages with the thread of the sunshade housing to drive the sunshade housing to reciprocate parallel to the light-inlet direction of the lens; and / or, the second drive structure includes a second motor and a second transmission screw; the second transmission screw is connected to the second motor, and the second motor drives the second transmission screw to rotate; the external thread of the second transmission screw engages with the thread of the air outlet plate to drive the air outlet plate to reciprocate parallel to the light-inlet direction of the lens.

[0013] Furthermore, the sunshade housing is movably disposed on the upper part of the first air curtain generating assembly; the sunshade housing has a sliding protrusion, and the upper part of the first air curtain generating assembly has a sliding groove, the extending direction of the sliding groove being parallel to the light-gathering direction of the lens; at least a portion of the sliding protrusion is disposed within the sliding groove and slides and is limited in contact with the inner wall of the sliding groove to constrain the sunshade housing to reciprocate along the extending direction of the sliding groove; or, the upper part of the first air curtain generating assembly has a sliding protrusion, and the sunshade housing has a sliding groove, the extending direction of the sliding groove being parallel to the light-gathering direction of the lens; at least a portion of the sliding protrusion is disposed within the sliding groove and slides and is limited in contact with the inner wall of the sliding groove to constrain the sunshade housing to reciprocate along the extending direction of the sliding groove; The inner wall of the sliding groove is slidably limited to constrain the reciprocating movement of the sunshade shell along the extension direction of the sliding groove; by setting the size of the sliding protrusion along the air outlet direction of the secondary air outlet, the field of view interference boundary of the sunshade shell to avoid the lens is set; and / or, the second air curtain generating assembly also includes a wind speed sensor and a controller; the wind speed sensor is set on the outside of the sunshade shell to measure the external wind speed; the wind speed sensor, the air outlet fan, the first drive structure and the second drive structure are electrically connected to the controller, and the controller controls the air outlet fan, the first drive structure and the second drive structure to work together according to the measurement data of the wind speed sensor.

[0014] According to another aspect of the present invention, an image acquisition device is provided, which includes the aforementioned dustproof and sunshade assembly; the image acquisition device also includes an image acquisition device, the lens of which is used to acquire external light; the dustproof and sunshade assembly is disposed on the upper part of the lens, and when the light-gathering direction of the lens is parallel to the horizontal direction, the dustproof and sunshade assembly blocks at least a portion of the light on the upper part of the lens.

[0015] According to another aspect of the present invention, a dust control method is provided for controlling the above-mentioned dust-proof and sunshade assembly; the dust control method includes: measuring the external wind speed, and adjusting at least one of the position of the secondary air outlet, the size of the secondary air outlet, the wind speed of the secondary air curtain, and the wind speed of the primary air curtain according to the external wind speed.

[0016] Furthermore, the dust control method also includes: classifying the external wind speed into calm, moderate, and strong wind levels from low to high based on the detected external wind speed; at the calm level, controlling the operation of the first air curtain generating component and shutting down the second air curtain generating component; at the moderate wind level, opening the second air curtain generating component and adjusting the wind speed, size, and position of the secondary air curtain according to the external wind speed in descending order of adjustment priority, so that the secondary air curtain isolates the external airflow from the primary air curtain and avoids the dustproof and sunshade components from obstructing the field of view interference boundary of the lens; at the strong wind level, when the wind speed of the secondary air curtain is at its maximum, the secondary air curtain is at its maximum, and the position of the secondary air curtain is at its furthest point from the first air curtain generating component, if the primary and secondary air curtains interfere under the influence of the external wind speed, an alarm signal is issued indicating that the wind resistance capability of the dustproof and sunshade components has reached its limit.

[0017] Furthermore, dust control methods also include: according to the formula: Calculate x, where x is the offset distance of the secondary air curtain along the light-incoming direction of the lens under the action of external airflow at the position furthest from the secondary air outlet of the lens; take the farthest end of the secondary air outlet along the light-incoming direction away from the lens as the first end, and the farthest end of the air outlet of the first air curtain generating component along the light-incoming direction away from the lens as the second end, and the distance between the first end and the second end along the light-incoming direction of the lens as the air outlet spacing X2; where H is the distance between the secondary air outlet and the end of the lens furthest from the secondary air outlet along the light-incoming direction perpendicular to the lens; V2 is the wind speed of the secondary air curtain, and b is the dimension of the secondary air outlet along the light-incoming direction of the lens; C n V represents the drag coefficient; Voutside represents the external wind speed. When the calculated x is greater than the current air outlet spacing X2, it is determined that the primary and secondary air curtains are interfering under the influence of the external wind speed. When the calculated x is greater than the maximum value of the air outlet spacing X2, an alarm signal is issued indicating that the wind resistance capability of the dustproof and sunshade components has reached its limit. Under moderate and / or strong wind conditions, when it is determined that the primary and secondary air curtains are interfering under the influence of the external wind speed, the wind speed of the secondary air curtain is first adjusted. If the wind speed of the secondary air curtain is adjusted to its maximum value, it is still determined that the primary and secondary air curtains are interfering under the influence of the external wind speed. The size of the secondary air outlet is then adjusted to adjust b. If the size of the secondary air outlet is adjusted to its maximum value, it is still determined that the primary and secondary air curtains are interfering under the influence of the external wind speed. The position of the secondary air outlet is then adjusted to adjust X2.

[0018] Applying the technical solution of this invention, this invention provides a dustproof and sunshade component, comprising: a first air curtain generating component and a second air curtain generating component. The first air curtain generating component is disposed between the lens of an image acquisition device and the second air curtain generating component. The first air curtain generating component filters external air to form a primary air curtain. Along the light-incoming direction of the lens, the primary air curtain blocks at least a portion of the lens to prevent dust from entering the lens. The second air curtain generating component draws in external air and blows it out through a secondary air outlet to form a secondary air curtain. Along the light-incoming direction of the lens, the secondary air curtain blocks at least a portion of the primary air curtain to isolate the influence of external wind speed on the primary air curtain. The air outlet direction of the primary air curtain generating component is parallel to the air outlet direction of the secondary air outlet, and the air outlet direction of the primary air curtain generating component is perpendicular to or at an angle to the light-incoming direction of the lens.

[0019] This invention utilizes a first and second air curtain generating component to work together. The filtered air, purified gas, forms a primary air curtain that shields at least a portion of the lens, providing primary dust protection. The second air curtain generating component draws in external air and blows it out through a secondary outlet, forming a secondary air curtain. This secondary air curtain shields at least a portion of the primary air curtain, isolating it from adverse external airflow and preventing unfiltered air from directly contacting the lens. This allows the primary air curtain to operate stably with less external interference, reducing the filtration burden on the first air curtain generating component and extending its lifespan. This extends maintenance cycles, lowers equipment operating costs, and significantly improves overall response efficiency, air utilization, and operational reliability. In practical applications on image acquisition equipment such as cameras, this dustproof and sunshade component has shown that it significantly improves the reliability and image quality of cameras under complex weather conditions, ensuring the working efficiency of outdoor cameras in harsh environments. In particular, it effectively improves dustproof and wind resistance, ensuring reliable operation under high wind speeds and high dust concentrations. This invention has a simple structure and low cost, and is easy to assemble and maintain. It solves the problems of limited wind resistance, insufficient dust protection in strong wind environments, and failure to balance wind protection performance with energy consumption and service life in existing air curtain generating devices. For cameras used outdoors for a long time, it has significant economic and social benefits and is suitable for large-scale promotion and use. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A schematic diagram of the overall structure of the dustproof and sunshade assembly provided in an embodiment of the present invention is shown;

[0022] Figure 2 An exploded structural diagram of the dustproof and sunshade assembly provided in an embodiment of the present invention is shown;

[0023] Figure 3 This diagram illustrates the working principle of the two-stage air curtain system of the dustproof and sunshade assembly provided in an embodiment of the present invention.

[0024] Figure 4 A schematic diagram of the failure of the secondary air curtain of the dustproof and sunshade assembly provided in an embodiment of the present invention is shown;

[0025] Figure 5 This diagram illustrates the deflection of the secondary air curtain of the dustproof and sunshade assembly provided in Embodiment 1 of the present invention by external wind speed.

[0026] Figure 6 This diagram illustrates the deflection of the secondary air curtain of the dustproof and sunshade assembly provided in Embodiment 2 of the present invention by external wind speed.

[0027] Figure 7 This diagram illustrates the deflection of the secondary air curtain of the dustproof and sunshade assembly provided in Embodiment 3 of the present invention by external wind speed.

[0028] Figure 8 A schematic diagram comparing the dustproof and sunshade components provided in embodiments of the present invention with and without a secondary air curtain is shown.

[0029] Figure 9 This diagram illustrates a comparison of the flow field characteristics of the primary air curtain failure of the dustproof and sunshade assembly provided in an embodiment of the present invention.

[0030] Figure 10 This diagram illustrates the extreme positions of the secondary air curtain of the dustproof and sunshade assembly provided in an embodiment of the present invention.

[0031] Figure 11 This diagram illustrates the dust distribution in the cavity area of ​​the dustproof and sunshade assembly provided in an embodiment of the present invention.

[0032] Figure 12 This diagram illustrates the flow field of the secondary air curtain of the dustproof and sunshade assembly provided in an embodiment of the present invention at its maximum position.

[0033] Figure 13 This diagram illustrates the dustproof effect of the secondary air curtain of the dustproof and sunshade assembly provided in an embodiment of the present invention at its maximum position.

[0034] Figure 14 This diagram illustrates a two-stage air curtain speed control strategy for a dust control method provided in an embodiment of the present invention.

[0035] Figure 15A control strategy logic block diagram of the dust control method provided by an embodiment of the present invention is shown.

[0036] The above figures include the following reference numerals:

[0037] 10. First air curtain generating assembly; 11. Primary air curtain; 12. Sliding groove;

[0038] 20. Second air curtain generating assembly; 21. Secondary air outlet; 22. Secondary air curtain; 23. Sunshade housing; 24. Air outlet panel; 25. Air outlet fan; 26. First drive structure; 261. First motor; 262. First transmission screw; 27. Second drive structure; 271. Second motor; 272. Second transmission screw; 28. Sliding protrusion; 29. ​​Wind speed sensor;

[0039] 30. Image acquisition equipment; 31. Lens. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a dustproof and sunshade assembly, including: a first air curtain generating assembly 10 and a second air curtain generating assembly 20. The first air curtain generating assembly 10 is disposed between the lens 31 of the image acquisition device 30 and the second air curtain generating assembly 20. The first air curtain generating assembly 10 filters external air to form a primary air curtain 11. Along the light-incoming direction of the lens 31, the primary air curtain 11 blocks at least a portion of the lens 31 to prevent dust from entering the lens 31. The second air curtain generating assembly 20 draws in external air and blows it out through a secondary air outlet 21 to form a secondary air curtain 22. Along the light-incoming direction of the lens 31, the secondary air curtain 22 blocks at least a portion of the primary air curtain 11 to isolate the influence of external airflow on the primary air curtain 11. The air outlet direction of the primary air curtain 11 generating assembly is parallel to the air outlet direction of the secondary air outlet 21, and the air outlet direction of the primary air curtain 11 generating assembly is perpendicular to or at an angle to the light-incoming direction of the lens 31.

[0042] This invention utilizes a first air curtain generating assembly 10 and a second air curtain generating assembly 20 working together to form a primary air curtain 11 from filtered air. The primary air curtain 11 shields at least a portion of the lens 31, achieving primary dust protection for the lens 31. The second air curtain generating assembly 20 draws in external air and blows it out through a secondary air outlet 21, forming a secondary air curtain 22. This secondary air curtain 22 shields at least a portion of the primary air curtain 11, reducing the adverse effects of external airflow on the primary air curtain 11 and lowering the risk of unfiltered airflow directly contacting the lens 31. This achieves the goal of keeping the primary air curtain 11 protected from external dust. Operating under less interference, this invention reduces the filtration burden on the first air curtain generating component 10 and extends its service life, extending the maintenance cycle and reducing equipment operating costs. It significantly improves overall response efficiency, air utilization, and operational reliability. When the dustproof and sunshade component proposed in this invention is actually used in image acquisition equipment 30 such as cameras, it has been found that this invention significantly improves the reliability and imaging quality of the camera under complex weather conditions, ensuring the working efficiency of outdoor cameras in harsh environments. In particular, it effectively improves dustproof and wind resistance performance, thereby ensuring reliable operation under high wind speed and high dust concentration conditions. This invention has a simple structure and low cost, is easy to assemble and maintain, and solves the problems of limited wind resistance, insufficient dustproof capability in strong wind environments, and failure to balance windproof performance with energy consumption and service life in existing air curtain generating devices. For cameras used outdoors for extended periods, it has significant economic and social benefits and is suitable for large-scale promotion and use.

[0043] like Figure 1 , Figure 2 and Figure 3 As shown, the position of the secondary air outlet 21 is adjustable; the size of the secondary air outlet 21 is adjustable; wherein, the farthest end of the secondary air outlet 21 along the light-incoming direction away from the lens 31 is the first end, the farthest end of the air outlet of the first air curtain generating assembly 10 along the light-incoming direction away from the lens 31 is the second end, the distance between the first end and the second end along the light-incoming direction of the lens 31 is the air outlet spacing X2, and the air outlet spacing X2 is adjusted by adjusting the position of the secondary air outlet 21; the size of the secondary air outlet 21 along the light-incoming direction of the lens 31 is the air outlet width b, and the air outlet width b is adjusted by adjusting the size of the secondary air outlet 21.

[0044] The position and size of the secondary air outlet 21 are designed to be adjustable. This innovation allows the system to dynamically adjust the outlet spacing X2 and outlet width b of the secondary air curtain 22 according to changes in ambient wind speed. Specifically, by adjusting the position of the secondary air outlet 21 along the light-inlet direction of the lens 31, the distance between the first and second ends along the light-inlet direction of the lens 31 can be changed, i.e., the outlet spacing X2. Simultaneously, by adjusting the size of the secondary air outlet 21 along the light-inlet direction of the lens 31, precise control of the outlet width b can be achieved. This design mechanism ensures that the secondary air curtain 22 can operate effectively under different wind speed conditions, avoiding direct interference from external wind to the primary air curtain 11, reducing the dependence of the primary air curtain generating component 10 on the filtration system, thereby extending the equipment maintenance cycle and improving dustproof efficiency and system stability. In practical applications, the dynamic adjustment strategy of the secondary air curtain 22 ensures wind resistance with low energy consumption, while not affecting the normal operation of the image acquisition device 30, providing a more reliable and energy-efficient dustproof protection solution for outdoor imaging equipment.

[0045] like Figures 3 to 4 As shown, the air outlet spacing X2 is greater than or equal to 2b; when the first end begins to block the field of view interference boundary of the lens 31, the value of the air outlet spacing X2 is a, and the air outlet spacing X2 is less than a; wherein, when the air outlet spacing X2 is equal to 2b, the air outlet velocity of the secondary air outlet 21 is greater than or equal to 2.4 times the air outlet velocity of the first air curtain generating component 10.

[0046] The air outlet spacing X2 is greater than or equal to 2b, ensuring that an effective buffer zone is formed between the secondary air curtain 22 blown out by the secondary air outlet 21 and the first air curtain generating component 10, avoiding direct interference of high-speed airflow to the primary air curtain 11. When the first end of the dustproof and sunshade component begins to block the field-of-view interference boundary of the lens 31, the value of X2 is a, and the air outlet spacing X2 is less than a at this time, thus maintaining the necessary gap between the camera's field-of-view interference boundary and the dustproof and sunshade component, preventing improper positioning of the dustproof and sunshade component from affecting imaging. In particular, when the air outlet spacing X2 is equal to 2b, the air velocity of the secondary air outlet 21 is greater than or equal to 2.4 times the air velocity of the first air curtain generating component 10. This condition ensures that the primary air curtain 11 can remain stable under the protection of the secondary air curtain 22, even when the external wind speed changes, effectively resisting external wind disturbance, reducing the maintenance frequency of the primary air curtain 11, reducing system energy consumption, and improving the reliability and imaging quality of the entire image acquisition device 30. By precisely controlling the air outlet speed of the secondary air curtain 22, not only is the negative impact of external wind speed on the primary air curtain 11 overcome, but the dual goals of dust prevention and energy saving are also achieved.

[0047] In one specific embodiment of the present invention, the maximum flow velocity of the secondary air curtain 22 is set to 12 m / s, and the flow velocity of the primary air curtain 11 is set to 5 m / s. Meanwhile, to ensure that the primary air curtain 11 is not disturbed and thus fails, X2min The air outlet width b must be no less than twice the width of the secondary air curtain 22, and when the distance is taken as the lower limit, V 2max It is 2.4 times that of V1. This condition represents the minimum safe distance and maximum safe speed to ensure the effective coordinated operation of the primary air curtain 11 and the secondary air curtain 22.

[0048] like Figure 1 and Figure 2 As shown, the second air curtain generating assembly 20 includes: a sunshade housing 23, an air outlet plate 24, an air outlet fan 25, a first drive structure 26, and a second drive structure 27; the secondary air outlet 21 communicates with the interior of the sunshade housing 23 and is located between the sunshade housing 23 and the air outlet plate 24; the sunshade housing 23 is movably disposed on the upper part of the first air curtain generating assembly 10 or on the image acquisition device 30, and is drivenly connected to the first drive structure 26; the first drive structure 26 is used to drive the sunshade housing 23 parallel to the mirror. The head 31 reciprocates in the direction of light intake to adjust the position of the secondary air outlet 21; the air outlet fan 25 is installed inside the sunshade housing 23 to draw in external air and blow it out through the secondary air outlet 21 to form a secondary air curtain 22; the air outlet plate 24 is movably installed on the sunshade housing 23 and is drivenly connected to the second drive structure 27; the second drive structure 27 is installed on the sunshade housing 23 to drive the air outlet plate 24 to reciprocate parallel to the direction of light intake of the lens 31 to adjust the size of the secondary air outlet 21.

[0049] The second air curtain generating assembly 20 integrates the sunshade housing 23, the air outlet panel 24, the air outlet fan 25, the first drive structure 26, and the second drive structure 27, which work together to form and control the secondary air curtain 22. The sunshade housing 23, through the first drive structure 26, moves parallel to the upper part of the first air curtain generating assembly 10, precisely adjusting the position of the secondary air outlet 21 to adapt to the effective layout of the secondary air curtain 22 under different wind speeds. The air outlet fan 25, built into the sunshade housing 23, draws in external air and blows it out through the secondary air outlet 21, constructing the secondary air curtain 22 as a protective barrier in front of the primary air curtain 11. Driven by the second drive structure 27, the air outlet panel 24 also moves parallel to the sunshade housing 23, finely adjusting the opening size of the secondary air outlet 21 to ensure that the flow rate and speed of the secondary air curtain 22 meet the current environmental requirements. The entire component is designed to effectively resist external wind disturbances by dynamically adjusting in real time, including the position, air velocity and flow rate of the secondary air curtain 22, thereby protecting the primary air curtain 11 from damage, maintaining its dustproof function, reducing the energy consumption and maintenance cost of the entire system, and improving the reliability and image quality of the camera under complex outdoor conditions.

[0050] like Figure 1 and Figure 2As shown, the fan speed of the exhaust fan 25 is adjustable to regulate the flow rate of the secondary air curtain 22; the outer periphery and inner wall of the part where the sunshade housing 23 and the air outlet plate 24 meet are both arc-shaped, with a radius of R on the outer periphery; the air outlet plate 24 is an arc plate, which protrudes along the light-incoming direction away from the lens 31, and the curvature of the air outlet plate 24 is adapted to the inner wall of the part where the sunshade housing 23 and the air outlet plate 24 meet, so that the secondary air outlet 21 is an arc-shaped air outlet; the air outlet plate 24 covers the outer periphery of the air outlet of the first air curtain generating assembly 10; the air outlet direction of the secondary air outlet 21 is perpendicular to the light-incoming direction of the lens 31.

[0051] The fan speed of the exhaust fan 25 is adjustable to adapt to the airflow requirements of the secondary air curtain 22 under different environments, ensuring that the secondary air curtain 22 can effectively resist external wind interference and maintain the protective effect of the primary air curtain 11. The mating part of the sunshade housing 23 and the air outlet plate 24 adopts an arc-shaped design, where the outer radius of the sunshade housing 23 is R, and the air outlet plate 24 protrudes along the direction away from the light-incoming direction of the lens 31. Its curvature matches the inner wall of the sunshade housing 23. This design makes the secondary air outlet 21 an arc-shaped air outlet, effectively guiding the airflow to form a more closely fitting protective layer. In addition, the air outlet plate 24 covers the outer periphery of the air outlet of the first air curtain generating assembly 10, and the air outlet direction of the secondary air outlet 21 is perpendicular to the light-incoming direction of the lens 31, ensuring that the secondary air curtain 22 can block external wind at the most suitable angle without affecting the camera's field of view. By organically combining the above-described structure and control methods, this invention enables intelligent management of the effective wind and dust resistance of the dustproof and sunshade components, significantly enhancing the reliability and imaging quality of the image acquisition device 30. In other embodiments not shown, the protective performance and energy efficiency of the air curtain can be further optimized by adjusting the specific geometric parameters of the sunshade housing 23 and the air outlet plate 24, as well as by changing the fan speed control strategy.

[0052] In one specific embodiment of the present invention, R can be determined empirically based on factors such as the optical parameters of the actual image acquisition device 30 and the requirements for realizing the sunshade function, so as to obtain a specific value.

[0053] like Figure 1 and Figure 2 As shown, projections are made along the air outlet direction of the secondary air outlet 21 onto a plane perpendicular to the air outlet direction of the secondary air outlet 21. The center of the arc of the outer periphery projection of the part where the sunshade shell 23 and the air outlet plate 24 meet, and the center of the arc of the inner wall projection of the part where the sunshade shell 23 and the air outlet plate 24 meet. The arcs of the outer periphery projection of the part where the sunshade shell 23 and the air outlet plate 24 meet, the arcs of the inner wall projection of the part where the sunshade shell 23 and the air outlet plate 24 meet, and the arcs of the air outlet plate 24 are all set in parallel. The air outlet spacing X2 is less than or equal to R.

[0054] The outer periphery and inner wall of the part where the sunshade shell 23 and the air outlet plate 24 meet are specially designed so that their projection on the plane perpendicular to the air outlet direction of the secondary air outlet 21 exhibits a concentric arc feature, which ensures uniform distribution and guidance of airflow. The arc projection of the air outlet plate 24 is set parallel to the inner and outer circumferential arc projections of the sunshade shell 23, further optimizing the formation and stability of the secondary air curtain 22, so that the air curtain can form a uniform and stable protective layer in front of the camera window. The air outlet spacing X2 is strictly controlled within the range of less than or equal to R, where R is the outer diameter of the air outlet. This setting ensures effective coordination between the secondary air curtain 22 and the primary air curtain 11, avoids mutual interference between airflows, and maintains complete coverage of the viewing window area, enhancing the dustproof effect. By precisely controlling the relationship between the air outlet spacing and the air curtain velocity, this solution can dynamically adjust the secondary air curtain 22 under different external wind speed environments, maintain the stable protective state of the primary air curtain 11, and significantly improve the reliability and imaging quality of the image acquisition device 30 in complex outdoor environments. In other embodiments not shown, further optimization of the structure of the sunshade housing 23 and the air outlet panel 24 can achieve a more efficient and stable air curtain protection effect, while reducing energy consumption and improving the overall system efficiency.

[0055] like Figure 1 and Figure 2 As shown, the first drive structure 26 includes a first motor 261 and a first transmission screw 262; the first transmission screw 262 is connected to the first motor 261, and the first motor 261 is used to drive the first transmission screw 262 to rotate; the external thread of the first transmission screw 262 is threadedly engaged with the sunshade housing 23 to drive the sunshade housing 23 to reciprocate parallel to the light-inlet direction of the lens 31; and / or, the second drive structure 27 includes a second motor 271 and a second transmission screw 272; the second transmission screw 272 is connected to the second motor 271, and the second motor 271 is used to drive the second transmission screw 272 to rotate; the external thread of the second transmission screw 272 is threadedly engaged with the air outlet plate 24 to drive the air outlet plate 24 to reciprocate parallel to the light-inlet direction of the lens 31.

[0056] The first drive structure 26 and the second drive structure 27 respectively include a first motor 261, a first transmission screw 262, a second motor 271, and a second transmission screw 272. The first motor 261 drives the first transmission screw 262 to rotate, which engages with the internal thread of the sunshade housing 23 to achieve precise reciprocating motion of the sunshade housing 23 along the light-inlet direction of the lens 31. Similarly, the second motor 271 drives the second transmission screw 272 to rotate, which is threadedly connected to the air outlet plate 24 to precisely control the displacement of the air outlet plate 24 in the light-inlet direction of the lens 31. The above-mentioned precise control ensures the dynamic adjustment of the secondary air curtain 22 to adapt to different external wind speed conditions, ensuring the effective dustproof performance of the primary air curtain 11 in various environments. By monitoring the ambient wind speed in real time and adjusting the position of the second air curtain generating component 20, the air outlet speed of the secondary air curtain 22, and the width of the secondary air outlet 21, this technical solution can achieve both the rational use of energy and the improvement of equipment stability while ensuring the dustproof effect of the image acquisition device 30. Furthermore, the combination of the first motor 261 and the first transmission screw 262, as well as the second motor 271 and the second transmission screw 272, provides a flexible operating method, facilitating personalized positioning of the second air curtain generating assembly 20 and refined management of air curtain parameters according to specific needs. When the external wind speed changes, the system can respond quickly by changing the drive strategy of the first motor 261 and the second motor 271, and adjusting the rotational speed and direction of the first transmission screw 262 and the second transmission screw 272. This precisely controls the relative position and air curtain properties between the second air curtain generating assembly 20 and the first air curtain generating assembly 10, ensuring the effective assistance of the secondary air curtain 22 to the primary air curtain 11, and enhancing the reliability and adaptability of the entire dustproof system.

[0057] like Figure 1 and Figure 2As shown, the sunshade housing 23 is movably disposed on the upper part of the first air curtain generating assembly 10; the sunshade housing 23 has a sliding protrusion 28, and the upper part of the first air curtain generating assembly 10 has a sliding groove 12, the extending direction of the sliding groove 12 being parallel to the light-gathering direction of the lens 31; at least a portion of the sliding protrusion 28 is disposed within the sliding groove 12 and is slidably limited in cooperation with the inner wall of the sliding groove 12 to constrain the sunshade housing 23 to reciprocate along the extending direction of the sliding groove 12; or, the upper part of the first air curtain generating assembly 10 has a sliding protrusion 28, the sunshade housing 23 has a sliding groove 12, the extending direction of the sliding groove 12 being parallel to the light-gathering direction of the lens 31; at least a portion of the sliding protrusion 28 is disposed within the sliding groove 12 and is slidably limited in cooperation with the inner wall of the sliding groove 12 to constrain the sunshade housing 23 to reciprocate along the extending direction of the sliding groove 12; The inner wall of the sliding groove 12 is slidably limited to constrain the reciprocating movement of the sunshade shell 23 along the extension direction of the sliding groove 12; by setting the size of the sliding protrusion 28 along the air outlet direction of the secondary air outlet 21, the sunshade shell 23 is set to avoid the field of view interference boundary of the lens 31; and / or, the second air curtain generating assembly 20 also includes a wind speed sensor 29 and a controller; the wind speed sensor 29 is set on the outside of the sunshade shell 23 and is used to measure the external wind speed; the wind speed sensor 29, the air outlet fan 25, the first drive structure 26 and the second drive structure 27 are electrically connected to the controller, and the controller controls the air outlet fan 25, the first drive structure 26 and the second drive structure 27 to work together according to the measurement data of the wind speed sensor 29.

[0058] The sunshade housing 23 reciprocates on the upper part of the first air curtain generating assembly 10 through the cooperation of the sliding protrusion 28 and the sliding groove 12. The extension direction of the sliding groove 12 is parallel to the light-incoming direction of the lens 31. This design ensures that the sunshade housing 23 can move along a set path, avoiding interference with the lens's field of view. At the same time, by controlling the size of the sliding protrusion 28 along the air outlet direction of the secondary air outlet 21, the avoidance limit of the sunshade housing 23 is precisely set. The second air curtain generating assembly 20 integrates a wind speed sensor 29 and a controller. The wind speed sensor 29 is located outside the sunshade housing 23 and is used to measure the ambient wind speed in real time. The controller is electrically connected to the wind speed sensor 29, the air outlet fan 25, the first drive structure 26, and the second drive structure 27. Based on the real-time data of the wind speed sensor 29, the controller coordinates and adjusts the operation of the air outlet fan 25 and the actions of the first drive structure 26 and the second drive structure 27 to achieve dynamic control of the position adjustment of the sunshade housing 23, the wind speed of the secondary air curtain 22, and the width of the secondary air outlet 21. This intelligent control mechanism ensures that the secondary air curtain 22 can effectively resist external wind interference, protecting the primary air curtain 11, while minimizing energy consumption and maintaining efficient equipment operation. Through these technical means, even in environments with frequently changing wind speeds, the viewing area of ​​the lens 31 of the image acquisition device 30 can be kept clean, significantly improving the reliability and imaging quality of the image acquisition device 30. Furthermore, the flexible adjustment capability of the second air curtain generating component 20 allows the equipment to automatically adjust to the optimal dustproof state under different wind speed conditions, thereby avoiding excessive wear and tear and inconvenient maintenance.

[0059] In one specific embodiment of the present invention, the second air curtain generating assembly 20 is mounted on the sliding groove 12 of the first air curtain generating assembly 10 via a sliding protrusion 28. Adjusting the height of the sliding protrusion 28 controls the second air curtain generating assembly 20 to avoid the field-of-view interference boundary of the lens 31. The position of the second air curtain generating assembly 20 is adjusted by the reciprocating motion of the first driving structure 26 on the sliding groove 12, thereby controlling the width of the secondary air outlet 21 of the second air curtain generating assembly 20, and / or, the second driving structure 27 controls the width of the air outlet plate 24, thereby controlling the width of the secondary air outlet 21. The wind speed of the secondary air curtain 22 can be controlled by adjusting the duty cycle of the air outlet fan 25. The airflow directions of the primary air curtain 11 and the secondary air curtain 22 are as follows: Figure 1 As shown by the red dashed line. The wind speed sensor 29 can monitor the external wind speed and dynamically adjust the system through the sunshade curtain control strategy, thereby improving the dustproof capability of the dustproof sunshade components while ensuring energy conservation and environmental protection.

[0060] like Figure 1 and Figure 2As shown, an embodiment of the present invention also provides an image acquisition device, which includes the dustproof and sunshade component described above; the image acquisition device also includes an image acquisition device 30, the lens 31 of which is used to acquire external light; the dustproof and sunshade component is disposed on the upper part of the lens 31, and when the light-incoming direction of the lens 31 is parallel to the horizontal direction, the dustproof and sunshade component blocks at least a portion of the light on the upper part of the lens 31.

[0061] The image acquisition device includes the aforementioned dustproof and sunshade assembly; the lens 31 of the image acquisition device 30 is used to acquire external light; the dustproof and sunshade assembly is disposed on the upper part of the lens 31, and when the light-incoming direction of the lens 31 is parallel to the horizontal direction, the dustproof and sunshade assembly blocks at least a portion of the light on the upper part of the lens 31. By integrating the dustproof and sunshade assembly with the image acquisition device, this embodiment ensures image acquisition quality and device reliability in outdoor environments. The dustproof and sunshade assembly not only effectively prevents dust from directly depositing on the lens 31, thereby protecting the image acquisition device from the effects of harsh environments, but also reduces glare above the lens 31 by blocking part of the light, improving image quality in strong light environments. More importantly, the presence of the secondary air curtain 22 further enhances the protection of the primary air curtain 11, and can dynamically adjust to maintain the dustproof and sunshade effect even under conditions of changing external wind speed, ensuring stable operation of the image acquisition device in various outdoor environments and extending the service life of the device.

[0062] In one specific embodiment of the present invention, a second air curtain generating component 20 is added to the existing image acquisition device 30 with a first air curtain generating component 10. When the external wind speed is strong, the secondary air curtain 22 blown out by the sunshade will weaken the intensity of the external wind speed and reduce the damage to the primary air curtain 11.

[0063] An embodiment of the present invention also provides a dust control method for the above-mentioned dust-proof sunshade assembly; the dust control method includes: measuring the external wind speed, and adjusting at least one of the following according to the external wind speed: the position of the secondary air outlet 21, the size of the secondary air outlet 21, the wind speed of the secondary air curtain 22, and the wind speed of the primary air curtain 11.

[0064] The dust control method also includes: classifying the external wind speed into calm, moderate, and strong wind levels according to the detected external wind speed; in the calm level, controlling the first air curtain generating component 10 to operate and the second air curtain generating component 20 to close; in the moderate wind level, opening the second air curtain generating component 20, and adjusting the wind speed of the secondary air curtain 22, the size of the secondary air outlet 21, and the position of the secondary air outlet 21 according to the external wind speed and in order of adjustment priority from high to low, so that the secondary air curtain 22 isolates the influence of the external wind speed on the primary air curtain 11 and avoids the dustproof and sunshade component from blocking the field of view interference boundary of the lens 31; in the strong wind level, when the wind speed of the secondary air curtain 22 is at its maximum, the secondary air outlet 21 is at its maximum, and the position of the secondary air outlet 21 is at its furthest point from the first air curtain generating component 10, if the primary air curtain 11 and the secondary air curtain 22 interfere under the influence of the external wind speed, an alarm signal is issued indicating that the wind resistance capability of the dustproof and sunshade component has reached its limit.

[0065] The dust control method includes real-time monitoring and classification of external wind speed (i.e., classifying external wind speeds from low to high as calm, moderate, and strong wind levels), and dynamically adjusting the parameters of the secondary air curtain 22 accordingly. At the calm level, only the first air curtain generating component 10 is activated, while the second air curtain generating component 20 remains closed, saving energy while providing basic protection. As the external wind speed increases to the moderate wind level, the second air curtain generating component 20 activates. The dustproof and sunshade components prioritize adjusting the wind speed of the secondary air curtain 22, then adjust the size of the secondary air outlet 21, and finally change the position of the secondary air outlet 21. This ensures that the secondary air curtain 22 can effectively isolate the impact of external wind speed on the primary air curtain 11, while simultaneously preventing the dustproof and sunshade components from obstructing the field of view of the lens 31, maintaining a clear observation range for the lens 31. Under strong wind conditions, when the wind speed of the secondary air curtain 22, the size of the secondary air outlet 21, and the position of the secondary air curtain 22 have all been adjusted to their limits, but interference with the primary air curtain 11 still cannot be avoided, the dustproof and sunshade component issues a "wind resistance limit reached" warning signal, reminding the user to take other protective measures. Through the above-mentioned multi-stage dustproof control method based on external wind speed, a balance is achieved between the protective effect of the secondary air curtain 22 and the energy consumption of the dustproof and sunshade component. This enhances the adaptability and dustproof effect of the dustproof and sunshade component in complex external wind speed environments, further ensuring the reliability of the dustproof and sunshade component.

[0066] Dust control methods also include: according to the formula: Calculate x, where x is the offset distance of the secondary air curtain 22 at the position furthest from the secondary air outlet 21 on the lens 31 along the light-incoming direction of the lens 31 under the action of external wind speed; take the farthest end of the secondary air outlet 21 along the light-incoming direction away from the lens 31 as the first end, and the farthest end of the air outlet of the first air curtain generating assembly 10 along the light-incoming direction away from the lens 31 as the second end, and the distance between the first end and the second end along the light-incoming direction of the lens 31 as the air outlet spacing X2; where H is the distance between the secondary air outlet 21 and the end of the lens 31 furthest from the secondary air outlet 21 along the light-incoming direction perpendicular to the lens 31; V2 is the wind speed of the secondary air curtain 22, and b is the dimension of the secondary air outlet 21 along the light-incoming direction of the lens 31; C n V represents the drag coefficient; Voutside represents the external wind speed. When the calculated x is greater than the current air outlet spacing X2, it is determined that the primary air curtain 11 and the secondary air curtain 22 are interfering under the influence of the external wind speed. When the calculated x is greater than the maximum value of the air outlet spacing X2, an alarm signal is issued indicating that the wind resistance capability of the dustproof and sunshade components has reached its limit. Under medium and / or strong wind conditions, when it is determined that the primary air curtain 11 and the secondary air curtain 22 are interfering under the influence of the external wind speed, the wind speed of the secondary air curtain 22 is first adjusted. When the wind speed of the secondary air curtain 22 is adjusted to its maximum value, it is still determined that the primary air curtain 11 and the secondary air curtain 22 are interfering under the influence of the external wind speed. The size of the secondary air outlet 21 is then adjusted to adjust b. When the secondary air outlet 21 is adjusted to its maximum value, it is still determined that the primary air curtain 11 and the secondary air curtain 22 are interfering under the influence of the external wind speed. The position of the secondary air outlet 21 is then adjusted to adjust X2.

[0067] The formula based on the dust control method can accurately calculate the offset distance x of the secondary air curtain 22 under the influence of external wind speed at the position of the lens 31 furthest from the secondary air outlet 21. By comparing x with the distance X2 between the primary air curtain 11 and the secondary air curtain 22, the dustproof and sunshade assembly can determine whether the secondary air curtain 22 interferes with the primary air curtain 11. Once x is greater than the current air outlet distance X2, the dustproof and sunshade assembly can confirm that the secondary air curtain 22 interferes with the primary air curtain 11 and prioritizes adjusting the wind speed V2 of the secondary air curtain 22. If, after adjusting V2 to its maximum value, the primary air curtain 11 and the secondary air curtain 22 still interfere with each other due to the external wind speed, the dustproof and sunshade assembly then adjusts the width b of the secondary air outlet 21 to further attempt to overcome the interference caused by the external wind speed. If the interference is still not eliminated when b is adjusted to its maximum value, a strategy of adjusting the position of the secondary air outlet 21 to change X2 is adopted until the interference is eliminated or the maximum value of X2 is reached. When X2 reaches its maximum value, the dustproof and sunshade components issue a "wind resistance limit reached" warning signal. Specifically designed for external wind speeds of moderate and strong wind levels, the above dustproof control method ensures effective protection of the primary air curtain 11, while optimizing the control parameters of the secondary air curtain 22 to achieve optimal wind resistance and dustproof effect with minimal energy consumption, ensuring the normal operation of the image acquisition device in harsh environments.

[0068] The design process, simulation experiment verification, and related principles of a specific embodiment of the present invention will now be described in detail as follows:

[0069] The working principle of the secondary air curtain 22 is as follows: Figure 3 As shown. The second air curtain generating component 20 forms a secondary air curtain 22 with a thickness of b and a flow velocity of V2 at the air outlet distance X2 between the viewing window of the lens 31 and the primary air curtain 11. The secondary air curtain 22 is isolated from the external interfering wind speed V. 外 After interaction, a secondary air curtain 22 offset distance x is generated at a distance H perpendicular to the light-incoming direction of the lens 31 at the end of the secondary air outlet 21 furthest from the lens 31. By dynamically adjusting the outlet width b and airflow velocity V2 of the secondary air curtain 22, it is possible to target different intensities of V. 外 To achieve precise control, the offset x of the secondary air curtain 22 at height H is always less than the air outlet distance x2; conversely, if the offset x of the air curtain at height H is greater than the reference distance x2, the secondary air curtain 22 is considered to be ineffective. Since the secondary air curtain 22 does not directly contact the viewing window of the lens 31, no air filtration equipment is needed, and a higher operating wind speed can be adopted to fully prevent dust from interfering with the image acquisition device 30. This allows the primary air curtain 11 to maintain only a low wind speed operation, while the entire dustproof and sunshade assembly also achieves high dustproof efficiency.

[0070] According to the confluence theory of fluid mechanics, the secondary air curtain 22 is affected by lateral external disturbance wind V. 外Under the influence of the force, it will deflect at a speed of V. 外 The force of the external wind on the secondary air curtain 22 satisfies , where F 外 C represents the force exerted by the external wind on the secondary air curtain 22. n ρ is the drag coefficient around the flow. 外 Let dx be the density of the external disturbing wind, and dx be the thickness of the secondary air curtain element 22. The centrifugal force experienced by the secondary air curtain element 22 under external wind disturbance satisfies... F 内 ρ is the centrifugal force acting on the 22 infinitesimal elements of the secondary air curtain. 内 The density of the secondary air curtain 22, A n Let be the cross-sectional area of ​​the infinitesimal element, v be the average velocity of the infinitesimal element, and R be the radius of curvature of the infinitesimal element's motion. During the motion of the secondary air curtain 22, the initial momentum flux is always proportional to the momentum flux at any cross-section during the motion, and according to the law of conservation of energy... It can be solved that the secondary air curtain 22 has a velocity of V. 外 The equation of the trajectory under external wind interference is Where y is the maximum distance H between the secondary air curtain 22 and the bottom of the lens window 31, the above formula can be rewritten as follows: (That is, the formula in the dust control method).

[0071] Due to the turbulence resistance coefficient C in the dust control method formula n It is related to the incoming Reynolds number, so it can be calculated using fluid dynamics (CFD) simulation. Assuming the window height H = 75 mm, the formula can be used to calculate the value of V at different external wind speeds. 外 Below, the velocity V2, position x, and air outlet width b of the secondary air curtain 22 are shown in Table 1, and the fluid dynamics (CFD) simulation results are as follows: Figure 5 , Figure 6 and Figure 7 As shown, after the secondary air curtain 22 is deflected by the external wind, the simulated offset distance x of the secondary air curtain 22 is close to the theoretically calculated offset distance x. Therefore, the turbulence drag coefficient C under this condition can be calculated through the above simulation. n .

[0072] Table 1. Parameters of the secondary air curtain under different external wind speeds.

[0073]

[0074] Furthermore, this application also verifies the dustproof effect of the image acquisition device using the dustproof and sunshade component of this application through fluid dynamics (CFD) simulation comparison, such as... Figure 8 As shown. See also Figure 8The left side shows a comparison of the dustproof effect of an image acquisition device using the dustproof and sunshade component of this application (i.e., with a secondary air curtain 22) and the right side shows a comparison of the dustproof effect of an image acquisition device without the dustproof and sunshade component of this application (i.e., without a secondary air curtain 22). This verifies the effectiveness of the secondary air curtain 22 in the dustproof and sunshade component of this application: environmental dust concentration 0.02 g / m³, particle size 20 μm, primary air curtain 11 velocity 3 m / s, and secondary air curtain 22 velocity 12 m / s with X2 = 60 mm. Simulation results show that the image acquisition device using the dustproof and sunshade component of this application only detected a trace amount of dust deposition (4 × 10⁻⁶ mm) in the lower left area of ​​the front panel. -10 g); while the image acquisition device that does not use the dustproof and sunshade component of this application (i.e., the image acquisition device with a single first air curtain generating component 10) is affected by the external wind speed V. 外 This caused instability in the fluid structure of the primary air curtain 11, resulting in large-scale dust deposition (8.03 × 10⁻⁶). -8 g); The results show that during the simulation period, the image acquisition device with dustproof and sunshade components of this application reduced the amount of dust deposition by more than 200 times and improved the anti-interference efficiency by 99.5%.

[0075] From a fluid dynamics perspective, to maintain the protective effectiveness of the primary air curtain 11, a minimum critical distance (i.e., X) must be maintained between the primary air curtain 11 and the secondary air curtain 22. 2min The minimum critical distance X 2min The design constraint stems from the difference in operating air velocity between the primary air curtain 11 and the secondary air curtain 22, as the flow velocity of the secondary air curtain 22 is significantly higher than that of the primary air curtain 11. According to Bernoulli's principle, when the distance X2 between the primary air curtain 11 and the secondary air curtain 22 is too small, the high-speed secondary air curtain 22 will generate a significant negative pressure zone in the vicinity. This negative pressure zone will aerodynamically interfere with the lower-velocity primary air curtain 11, manifesting as attracting or deflecting the airflow of the primary air curtain 11 towards the secondary air curtain 22. This can lead to the primary air curtain 11 being destructively pulled away from its designed protective position, resulting in the complete exposure of the viewing area of ​​the lens 31. Consequently, the protection provided by the primary air curtain 11 is lost. Furthermore, at the location of the failed primary air curtain 11 (i.e., in front of the viewing window of the lens 31), the negative pressure effect directly drives dirty air from the environment to flow back towards the viewing surface of the lens 31; this not only fails to block dust but also accelerates the accumulation and adhesion of dust on the viewing window of the lens 31. See also Figure 9 The flow field characteristics shown are as follows: Figure 9 The left side shows a normal Level 1 air curtain 11, while the right side shows a damaged Level 1 air curtain 11.

[0076] To verify the minimum critical distance X obtained from the analysis of flow mechanics theory 2min Based on fluid dynamics (CFD) simulation, the key constraint values ​​were obtained: the minimum safe distance lower limit X2 between the primary air curtain 11 and the secondary air curtain 22.2min and the second-stage air curtain 22 flow velocity V2 maximum safe speed V 2max Through fluid dynamics (CFD) simulation analysis (e.g., setting conditions: maximum flow velocity of secondary air curtain 22 12 m / s, flow velocity of primary air curtain 11 5 m / s), it is clearly concluded that: to ensure that primary air curtain 11 is not disturbed and fails, X 2min The air outlet width b must be no less than twice the width of the secondary air curtain 22, and when the distance is taken as the lower limit, V 2max It is 2.4 times that of V1. This condition is the minimum safe distance and maximum safe speed (X2) to ensure the effective coordinated operation of the primary air curtain 11 and the secondary air curtain 22.

[0077] Secondly, based on actual design considerations and simulation verification, key constraint values ​​for the movable range of the secondary air curtain 22 (i.e., the distance X2 between the primary air curtain 11 and the secondary air curtain 22) are further given: the distance X2 between the primary air curtain 11 and the secondary air curtain 22 is controlled within the range of [2b, R]. In actual design, the movable range of the secondary air curtain 22 needs to be strictly limited to the lower limit of the minimum critical distance 2b, and the upper limit of the physical interference limit position between the secondary air curtain 22 structure itself and the field of view of the lens 31, i.e., [2b, camera field of view interference boundary]. Specifically, when the secondary air curtain 22 moves to its maximum value and coincides with the field of view of the lens 31, a cavity area will be formed between the secondary air curtain 22 and the primary air curtain 11, such as... Figure 11 The area within the red box is the cavity mentioned above, and it is clear that dust has accumulated in the cavity.

[0078] Because the distance between the primary air curtain 11 and the secondary air curtain 22 is too large, the secondary air curtain 22 cannot completely enclose the primary air curtain 11. As a result, the blocked dust is drawn back into the cavity area under the pressure generated by the velocity difference of the secondary air curtain 22, as shown in the fluid dynamics (CFD) simulation results. Figure 12 As shown.

[0079] At this point, the dust directly contacts the primary air curtain 11. If the external wind speed is high (e.g., 8 m / s), the dust still possesses sufficient kinetic energy to damage the primary air curtain 11's protection. Figure 13 Fluid dynamics (CFD) simulations show that even if the secondary air curtain 22 does not completely fail under this condition, dust still accumulates on the viewing surface of the lens 31. Therefore, through the above simulation verification, the maximum distance between the secondary air curtain 22 and the primary air curtain 11 must be limited to within the radius R of the outer perimeter of the mating part of the sunshade housing 23 and the air outlet plate 24. In summary, the movable range of the secondary air curtain 22 needs to be controlled within the range of [2b, R]. Figure 10 The area within the red box shows the movable range of the secondary air curtain 22.

[0080] The dust control method of this application is based on the dust control method formula: The system employs an integrated end-to-end design, namely the secondary air curtain 22 setting and control strategy system. When the system determines that the primary air curtain 11 and the secondary air curtain 22 are interfering under the influence of external wind speed, it prioritizes adjusting the wind speed of the secondary air curtain 22. Even when the wind speed of the secondary air curtain 22 is adjusted to its maximum value, it still determines that the primary air curtain 11 and the secondary air curtain 22 are interfering under the influence of external wind speed, and then adjusts the size of the secondary air outlet 21 to adjust b. Even when the secondary air outlet 21 is adjusted to its maximum value, it still determines that the primary air curtain 11 and the secondary air curtain 22 are interfering under the influence of external wind speed, and finally adjusts the position of the secondary air outlet 21 to adjust X2. When the external wind speed increases, and the primary air curtain 11 and the secondary air curtain 22 interfere with each other under the influence of the external wind speed, increasing the wind speed of the secondary air curtain 22 to increase V2 and increasing the size of the secondary air outlet 21 to increase b can reduce the offset distance x of the secondary air curtain 22 along the light-incoming direction of the lens 31 under the action of the external wind speed, thereby avoiding interference between the primary air curtain 11 and the secondary air curtain 22. Increasing X2 to increase the distance between the primary air curtain 11 and the secondary air curtain 22 can also prevent interference between them. Refer to the working principle of the secondary air curtain 22 as follows... Figure 3 As shown.

[0081] During the actual operation of the dustproof and sunshade component of this application, due to the constant changes in ambient wind, in order to enhance the robustness of the secondary air curtain 22-level position and control strategy system (hereinafter referred to as the system in the dustproof control method), the ambient wind speed (i.e., V) is adjusted. 外 The system is divided into four intervals, taking the device in this embodiment as an example (the actual product can be redefined according to the provided air volume and product size): Calm - 1 (wind speed 0-1m / s), Light - 2 (wind speed 1-3m / s), Medium - 3 (wind speed 3-5m / s), and Strong - 4 (wind speed 5-8m / s). Each time the interval is changed, the secondary air outlet 21 of the secondary air curtain 22 automatically moves to the maximum position of that interval, and the distance between the primary air curtain 11 and the secondary air curtain 22 gradually increases from Calm - 1 to Strong - 4 (i.e., X2 in the dust control method formula gradually increases). The system of this application implements a stepped adjustment scheme, dynamically adjusting the interval mode of the secondary air curtain 22 according to the external wind speed, such as... Figure 14 As shown. Simultaneously, the wind speed of the secondary air curtain 22 (i.e., V2 in the dust control method formula) and the width of the secondary air outlet 21 (i.e., b in the dust control method formula) will be adjusted according to the current external wind speed. When the system detects the external wind speed (i.e., V... 外 After obtaining the data, based on the external wind speed (i.e., V) 外 Adjusting the operating level of the secondary air curtain 22, the specific implementation strategy is as follows: Figure 15 .

[0082] Specifically, after the equipment is started, the primary air curtain 11 immediately operates stably at a wind speed of 3 m / s, while the fan of the secondary air curtain 22 remains stationary; the system records the parameters of the primary air curtain 11 and the secondary air curtain 22 during normal operation and receives the external wind speed data V uploaded by the wind speed sensor 29. 外 This allows for accurate assessment of the level of external interference. The system first determines whether the environment is calm (i.e., V). 外 If the ambient speed is 0-1 m / s, and the environment is calm, the secondary air curtain 22 fan will start and enter calm mode, while the secondary air curtain 22 fan will remain stopped; if the environment is not calm, the system will further determine whether the environment is a light breeze (i.e., V). 外 (1-3 m / s).

[0083] When the system determines that the environment is not a light breeze (i.e., V) 外 When the speed is 1-3 m / s, the system will further determine whether the environment is a stroke (i.e., V). 外 (3-5 m / s); When the system determines that the environment is a light breeze, the system activates the secondary air curtain 22 and further determines whether the secondary air curtain 22 interferes with the primary air curtain 11. If the secondary air curtain 22 does not interfere with the primary air curtain 11, the system maintains normal operation and continues to record the parameters of the primary air curtain 11 and the secondary air curtain 22. If the secondary air curtain 22 interferes with the primary air curtain 11, the system will prioritize adjusting the duty cycle of the outlet fan 25 (i.e., adjusting the speed of the outlet fan 25) to increase the air speed of the secondary air curtain 22. If the air speed of the secondary air curtain 22 does not exceed the threshold, the system continues to determine whether the secondary air curtain 22 interferes with the primary air curtain 11. If the air speed of the secondary air curtain 22 exceeds the threshold, the system will choose to adjust the width of the secondary air outlet 21 of the secondary air curtain 22. If the width of the secondary air outlet 21 of the secondary air curtain 22 does not exceed the threshold, the system will maintain normal operation and continue to record the parameters of the primary air curtain 11 and the secondary air curtain 22; if the width of the secondary air outlet 21 of the secondary air curtain 22 exceeds the threshold, the system will further determine whether the environment is a stroke (i.e., V). 外 (3-5 m / s).

[0084] When the system determines that the environment is not a stroke (i.e., V) 外 When the wind speed is 3-5 m / s, the system will further determine whether the environment is a strong wind (i.e., V). 外 (5-8 m / s); when the system determines that the environment is a stroke, the system automatically moves the secondary air curtain 22 to level 2, and further determines whether the secondary air curtain 22 interferes with the primary air curtain 11. If the secondary air curtain 22 does not interfere with the primary air curtain 11, the system will receive the external wind speed data V uploaded by the wind speed sensor 29. 外The system then determines whether the environment is calm. If the secondary air curtain 22 interferes with the primary air curtain 11, the system will prioritize adjusting the duty cycle of the outlet fan 25 (i.e., adjusting the speed of the outlet fan 25) to increase the air velocity of the secondary air curtain 22. If the air velocity of the secondary air curtain 22 does not exceed the threshold, the system continues to determine whether the secondary air curtain 22 interferes with the primary air curtain 11. If the air velocity of the secondary air curtain 22 exceeds the threshold, the system will adjust the width of the secondary air outlet 21 of the secondary air curtain 22. If the width of the secondary air outlet 21 of the secondary air curtain 22 does not exceed the threshold, the system will continue to maintain normal operation and continue to record the parameters of the primary air curtain 11 and the secondary air curtain 22. If the width of the secondary air outlet 21 of the secondary air curtain 22 exceeds the threshold, the system will further determine whether the environment is a strong wind (i.e., V). 外 (5-8 m / s).

[0085] When the system determines that the environment is not strong wind (i.e., V) 外 If the external wind speed is 5-8 m / s, then it indicates that the external wind speed V 外 If the wind continues to intensify and all control measures become ineffective (such as the distance between the primary air curtain 11 and the secondary air curtain 22, the wind speed of the secondary air curtain 22, and the width of the secondary air outlet 21), the system will quickly issue a "wind resistance limit reached" warning signal and maintain normal operation while continuing to record the parameters of the primary air curtain 11 and the secondary air curtain 22 to ensure the safety and controllability of the image acquisition device. When the system determines that the environment is a strong wind, it will automatically move the secondary air curtain 22 to level 3 and further determine whether the secondary air curtain 22 interferes with the primary air curtain 11. If the secondary air curtain 22 does not interfere with the primary air curtain 11, the system will maintain normal operation and continue to record the parameters of the primary air curtain 11 and the secondary air curtain 22. If the secondary air curtain 22 interferes with the primary air curtain 11, the system will prioritize adjusting the duty cycle of the outlet fan 25 to increase the wind speed of the secondary air curtain 22. If the wind speed of the secondary air curtain 22 does not exceed the threshold, the system continues to determine whether the secondary air curtain 22 interferes with the primary air curtain 11. If the wind speed of the secondary air curtain 22 exceeds the threshold, the system will adjust the width of the secondary air outlet 21 of the secondary air curtain 22. If the width of the secondary air outlet 21 of the secondary air curtain 22 does not exceed the threshold, the system will continue to determine whether the environment is a strong wind. If the width of the secondary air outlet 21 of the secondary air curtain 22 exceeds the threshold, the system will quickly issue a "wind resistance limit reached" warning signal and maintain normal operation while continuing to record the parameters of the primary air curtain 11 and the secondary air curtain 22.

[0086] In summary, the dust control method of this application adopts an integrated full-process design based on data monitoring, and collects external wind speed parameters in real time through wind speed sensor 29; it successfully achieves precise control of wind resistance performance (such as maintaining the wind speed of the first-stage air curtain 11 at 3m / s) and dynamic adaptation (automatically adjusting the duty cycle of the outlet fan 25 or the width of the second-stage air outlet 21 according to changes in external wind speed). At the optimization level, the dust control method significantly improves system response efficiency (e.g., reducing decision delay), resource utilization (reducing power consumption at low external wind speeds), and operational reliability (e.g., preventing overload risks through the multi-mode redundancy mechanism of the secondary air curtain 22). By precisely controlling the wind speed of the outlet fan 25, the position of the secondary air outlet 21, and the width of the secondary air curtain 22, dynamic adjustments are achieved according to changes in external wind speed. Ultimately, this allows the dustproof and sunshade assembly to maintain efficient and energy-saving operation at low external wind speeds, while ensuring optimal dustproof performance under various external wind speed conditions. This allows the primary air curtain 11 to operate stably at lower wind speeds, reducing the burden on the primary air curtain 11 filter and extending the service life of the dustproof and sunshade assembly. In practical applications, the dual air curtain protection mechanism combining the primary air curtain 11 and the secondary air curtain 22 not only reduces the impact of dust on the lens 31 but also reduces the energy consumption of the dustproof and sunshade assembly, offering better economic benefits for cameras used outdoors for extended periods.

[0087] In summary, this invention provides a dustproof and sunshade component, an image acquisition device, and a dust control method. By cooperating with a first air curtain generating component 10 and a second air curtain generating component 20, the purified gas obtained after air filtration forms a primary air curtain 11. This primary air curtain 11 shields at least a portion of the lens 31, achieving primary air curtain dust protection for the lens 31. Furthermore, by using the second air curtain generating component 20 to draw in external gas and blow it out through a secondary air outlet 21, a secondary air curtain 22 is formed. This secondary air curtain 22 shields at least a portion of the primary air curtain 11, isolating the primary air curtain 11 from the adverse effects of external wind speed and preventing unfiltered airflow from directly contacting the lens 31. 1. This allows the primary air curtain 11 to operate stably under lower external interference, reducing the filtration burden on the first air curtain generating component 10 and extending its service life. It also extends the maintenance cycle, reduces equipment operating costs, and significantly improves overall response efficiency, air utilization, and operational reliability. When the dustproof and sunshade component proposed in this invention is actually used in image acquisition equipment 30 such as cameras, it has been found that this invention significantly improves the reliability and imaging quality of cameras under complex weather conditions, ensuring the working efficiency of outdoor cameras in harsh environments. In particular, it effectively improves dustproof and wind resistance performance, thereby ensuring reliable operation under high wind speed and high dust concentration conditions. This invention has a simple structure and low cost, is easy to assemble and maintain, and solves the problems of limited wind resistance, insufficient dustproof capability in strong wind environments, and failure to balance windproof performance with energy consumption and service life in existing air curtain generating devices. For cameras used outdoors for extended periods, it has significant economic and social benefits and is suitable for large-scale promotion and use.

[0088] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered to be within the scope of this specification.

[0089] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0090] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0091] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0092] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0093] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dustproof and sunshade component, characterized in that, include: A first air curtain generating assembly (10) and a second air curtain generating assembly (20) are provided. The first air curtain generating assembly (10) is disposed between the lens (31) of the image acquisition device (30) and the second air curtain generating assembly (20). The first air curtain generating assembly (10) filters external air to form a primary air curtain (11). Along the light-gathering direction of the lens (31), the primary air curtain (11) blocks at least a portion of the lens (31) to prevent dust from entering the lens (31). The second air curtain generating assembly (20) is also provided. External gas is drawn in and blown out through a secondary air outlet (21) to form a secondary air curtain (22); along the light-gathering direction of the lens (31), the secondary air curtain (22) blocks at least a portion of the primary air curtain (11) to isolate the influence of external airflow on the primary air curtain (11); wherein, the air-gathering direction of the primary air curtain (11) generating component is parallel to the air-gathering direction of the secondary air outlet (21), and the air-gathering direction of the primary air curtain (11) generating component is perpendicular to or has an angle with the light-gathering direction of the lens (31).

2. The dustproof and sunshade assembly according to claim 1, characterized in that, The position of the secondary air outlet (21) is adjustable; the size of the secondary air outlet (21) is adjustable; wherein, the farthest end of the secondary air outlet (21) along the light-inlet direction away from the lens (31) is the first end, the farthest end of the air outlet of the first air curtain generating assembly (10) along the light-inlet direction away from the lens (31) is the second end, the distance between the first end and the second end along the light-inlet direction of the lens (31) is the air outlet spacing X2, and the air outlet spacing X2 is adjusted by adjusting the position of the secondary air outlet (21); the size of the secondary air outlet (21) along the light-inlet direction of the lens (31) is the air outlet width b, and the air outlet width b is adjusted by adjusting the size of the secondary air outlet (21).

3. The dustproof and sunshade assembly according to claim 2, characterized in that, The air outlet spacing X2 is greater than or equal to 2b; when the first end begins to block the field of view interference boundary of the lens (31), the value of the air outlet spacing X2 is a, and the air outlet spacing X2 is less than a; wherein, when the air outlet spacing X2 is equal to 2b, the air outlet speed of the secondary air outlet (21) is greater than or equal to 2.4 times the air outlet speed of the first air curtain generating component (10).

4. The dustproof and sunshade assembly according to claim 2, characterized in that, The second air curtain generating assembly (20) includes: a sunshade housing (23), an air outlet plate (24), an air outlet fan (25), a first drive structure (26), and a second drive structure (27); the secondary air outlet (21) communicates with the interior of the sunshade housing (23) and is located between the sunshade housing (23) and the air outlet plate (24); the sunshade housing (23) is movably disposed on the upper part of the first air curtain generating assembly (10) or on the image acquisition device (30), and is drivenly connected to the first drive structure (26); the first drive structure (26) is used to drive the sunshade housing (23) parallel to the lens. (31) The light-inlet direction reciprocates to adjust the position of the secondary air outlet (21); the air outlet fan (25) is set inside the sunshade shell (23) to draw in external gas and blow it out through the secondary air outlet (21) to form the secondary air curtain (22); the air outlet plate (24) is movably set on the sunshade shell (23) and is driven to connect with the second drive structure (27); the second drive structure (27) is set on the sunshade shell (23) to drive the air outlet plate (24) to reciprocate parallel to the light-inlet direction of the lens (31) to adjust the size of the secondary air outlet (21).

5. The dustproof and sunshade assembly according to claim 4, characterized in that, The fan speed of the air outlet fan (25) is adjustable to adjust the flow rate of the secondary air curtain (22); the outer periphery and inner wall of the part where the sunshade shell (23) and the air outlet plate (24) meet are both arc-shaped, and the radius of the outer periphery is R; the air outlet plate (24) is an arc plate, the arc plate protrudes along the light-incoming direction away from the lens (31), and the curvature of the air outlet plate (24) is adapted to the inner wall of the part where the sunshade shell (23) and the air outlet plate (24) meet, so that the secondary air outlet (21) is an arc-shaped air outlet; the air outlet plate (24) covers the outer periphery of the air outlet of the first air curtain generating assembly (10); the air outlet direction of the secondary air outlet (21) is perpendicular to the light-incoming direction of the lens (31).

6. The dustproof and sunshade assembly according to claim 5, characterized in that, Projecting along the air outlet (21) onto a plane perpendicular to the air outlet (21), the center of the arc of the outer periphery of the part where the sunshade shell (23) and the air outlet plate (24) meet, and the center of the arc of the inner wall of the part where the sunshade shell (23) and the air outlet plate (24) meet coincide; the arc of the outer periphery of the part where the sunshade shell (23) and the air outlet plate (24) meet, the arc of the inner wall of the part where the sunshade shell (23) and the air outlet plate (24) meet, and the arc of the air outlet plate (24) are respectively arranged in parallel; wherein, the air outlet spacing X2 is less than or equal to R.

7. The dustproof and sunshade assembly according to claim 4, characterized in that, The first drive structure (26) includes a first motor (261) and a first transmission screw (262); the first transmission screw (262) is connected to the first motor (261), and the first motor (261) is used to drive the first transmission screw (262) to rotate; the external thread of the first transmission screw (262) is threadedly engaged with the sunshade shell (23) to drive the sunshade shell (23) to reciprocate parallel to the light-gathering direction of the lens (31); And / or, the second drive structure (27) includes a second motor (271) and a second transmission screw (272); the second transmission screw (272) is connected to the second motor (271), and the second motor (271) is used to drive the second transmission screw (272) to rotate; the external thread of the second transmission screw (272) is threadedly engaged with the air outlet plate (24) to drive the air outlet plate (24) to reciprocate parallel to the light-gathering direction of the lens (31).

8. The dustproof and sunshade assembly according to claim 4, characterized in that, The sunshade housing (23) is movably disposed on the upper part of the first air curtain generating assembly (10); the sunshade housing (23) has a sliding protrusion (28), and the upper part of the first air curtain generating assembly (10) has a sliding groove (12), the extending direction of the sliding groove (12) being parallel to the light-gathering direction of the lens (31); at least a portion of the sliding protrusion (28) is disposed within the sliding groove (12) and is slidably limited to the inner wall of the sliding groove (12) to constrain the sunshade housing (23) to reciprocate along the extending direction of the sliding groove (12); or, the first air curtain generating assembly (10) The upper part of the sunshade housing (23) has a sliding protrusion (28), and the sunshade housing (23) has a sliding groove (12). The extension direction of the sliding groove (12) is parallel to the light-gathering direction of the lens (31). At least a portion of the sliding protrusion (28) is disposed in the sliding groove (12) and is slidably limited to the inner wall of the sliding groove (12) to constrain the sunshade housing (23) to reciprocate along the extension direction of the sliding groove (12). By setting the size of the sliding protrusion (28) along the air outlet direction of the secondary air outlet (21), the sunshade housing (23) is set to avoid the field of view interference boundary of the lens (31). And / or, the second air curtain generating assembly (20) further includes a wind speed sensor (29) and a controller; the wind speed sensor (29) is disposed outside the sunshade housing (23) and is used to measure the external wind speed; the wind speed sensor (29), the air outlet fan (25), the first drive structure (26) and the second drive structure (27) are electrically connected to the controller respectively, and the controller controls the air outlet fan (25), the first drive structure (26) and the second drive structure (27) to work together according to the measurement data of the wind speed sensor (29).

9. An image acquisition device, characterized in that, The image acquisition device includes the dustproof and sunshade assembly as described in any one of claims 1 to 8; the image acquisition device further includes an image acquisition device (30), the lens (31) of the image acquisition device (30) is used to acquire external light; the dustproof and sunshade assembly is disposed on the upper part of the lens (31), and when the light-gathering direction of the lens (31) is parallel to the horizontal direction, the dustproof and sunshade assembly blocks at least a portion of the light on the upper part of the lens (31).

10. A dust control method, characterized in that, The dust control method is used to control the dustproof and sunshade assembly according to any one of claims 1 to 8; the dust control method includes: measuring the external wind speed, and adjusting at least one of the position of the secondary air outlet (21), the size of the secondary air outlet (21), the wind speed of the secondary air curtain (22), and the wind speed of the primary air curtain (11) according to the external wind speed.

11. The dust control method according to claim 10, characterized in that, The dust control method further includes: Based on the detected external wind speed, the external wind speed is divided into calm level, moderate wind level, and strong wind level from low to high. Under the calm level, the first air curtain generating component (10) is controlled to operate, and the second air curtain generating component (20) is turned off. Under the moderate wind level, the second air curtain generating component (20) is turned on, and according to the external wind speed, the wind speed of the secondary air curtain (22), the size of the secondary air outlet (21), and the position of the secondary air outlet (21) are adjusted in order of adjustment priority from high to low, so that the secondary air curtain (22) can be activated. 2) Isolate the external airflow from the primary air curtain (11) and prevent the dustproof and sunshade assembly from blocking the field of view interference boundary of the lens (31); under the strong wind level, when the wind speed of the secondary air curtain (22) is at its maximum, the secondary air outlet (21) is at its maximum, and the position of the secondary air outlet (21) is at its furthest point from the primary air curtain generating assembly (10), if the primary air curtain (11) and the secondary air curtain (22) interfere under the influence of the external wind speed, an alarm signal is issued indicating that the wind resistance capability of the dustproof and sunshade assembly has reached its limit.

12. The dust control method according to claim 11, characterized in that, The dust control method further includes: According to the formula: Calculate x, where x is the offset distance of the secondary air curtain (22) at the position furthest from the secondary air outlet (21) on the lens (31) along the light-incoming direction of the lens (31) under the action of external airflow; take the farthest end of the secondary air outlet (21) along the light-incoming direction away from the lens (31) as the first end, and take the farthest end of the air outlet of the first air curtain generating assembly (10) along the light-incoming direction away from the lens (31) as the second end, and the distance between the first end and the second end along the light-incoming direction of the lens (31) as the air outlet spacing X2; where H is the distance between the secondary air outlet (21) and the end of the lens (31) furthest from the secondary air outlet (21) along the light-incoming direction perpendicular to the lens (31); V2 is the wind speed of the secondary air curtain (22), and b is the size of the secondary air outlet (21) along the light-incoming direction of the lens (31); C n V is the drag coefficient around the flow; 外 External wind speed; When the calculated x is greater than the air outlet spacing X2 at this time, it is determined that the primary air curtain (11) and the secondary air curtain (22) interfere with each other under the influence of the external wind speed. When the calculated x is greater than the maximum value of the air outlet distance X2, an alarm signal is issued indicating that the wind resistance capability of the dustproof and sunshade component has reached its limit. Under the medium wind level and / or the strong wind level, when it is determined that the primary air curtain (11) and the secondary air curtain (22) interfere with each other under the influence of external wind speed, first adjust the wind speed of the secondary air curtain (22). When the wind speed of the secondary air curtain (22) is adjusted to the maximum value, it is still determined that the primary air curtain (11) and the secondary air curtain (22) interfere with each other under the influence of external wind speed. Adjust the size of the secondary air outlet (21) to adjust b. When the secondary air outlet (21) is adjusted to the maximum value, it is still determined that the primary air curtain (11) and the secondary air curtain (22) interfere with each other under the influence of external wind speed. Adjust the position of the secondary air outlet (21) to adjust X2.

Images