Rain and dust proof multi-rotor unmanned aerial vehicle

Abstract

The application provides a rainproof and dustproof multi-rotor unmanned aerial vehicle, and relates to the technical field of unmanned aerial vehicles. The rainproof and dustproof multi-rotor unmanned aerial vehicle comprises a vibration cavity type airflow sound wave generator, a sound wave guide pipe network, a radiation hole, a compressed air storage tank and a control unit arranged in a machine body, the sound wave guide pipe network is distributed in the machine body and a machine arm, the radiation hole is directed to the outer surface of the machine body and the machine arm, and the control unit controls the vibration cavity type airflow sound wave generator to work in a frequency conversion scanning mode after the unmanned aerial vehicle lands and the motor stops rotating. The frequency conversion sound wave is automatically generated after the machine stops, radiated to the outer surface of the machine body through the guide pipe network, and used for forced vibration and falling of the attached dust, so that automatic dust removal of the whole machine body is realized, manual cleaning is not needed, and the continuous operation capacity and use convenience of the unmanned aerial vehicle in a high dust environment are significantly improved.

Description

Technical Field

[0001] This application relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a rainproof and dustproof multi-rotor UAV. Background Technology

[0002] Multi-rotor drones, due to their advantages such as maneuverability, stable hovering, and ease of operation, have been widely used in many fields, including agricultural and forestry plant protection, power line inspection, logistics and express delivery, police patrol, and environmental monitoring. In these application scenarios, drones often need to take off, land, and fly in open environments, inevitably encountering adverse weather or environmental conditions such as rain, dust, sandstorms, and dense smoke.

[0003] For related technologies, please refer to Chinese Utility Model Patent No. CN216834287U. This utility model discloses a waterproof and dustproof structure for a multi-rotor drone, including a fuselage. Six wings are fixedly connected to the outer surface of the fuselage. Each wing has a through hole, and a cross support block is fixedly connected to each through hole. A drive motor is fixedly installed on the upper outer surface of each cross support block, and a propeller is fixedly connected to the output end of each drive motor. In this waterproof and dustproof structure for the multi-rotor drone, all environmentally sensitive components are placed inside the fuselage through structural design. The entire fuselage is sealed, and the sealed cover encloses the drive motors. Dust and rainwater cannot enter the interior of the sealed cover. When the drone is working, rainwater cannot enter the interior of the sealed cover through the waterproof box, and dust is blocked by a dustproof net. Dust and rainwater cannot come into contact with the drive motors, achieving true waterproof and dustproof protection and improving its usability and practicality.

[0004] However, existing waterproof and dustproof drones still have the following shortcomings: the dustproof net will gradually become clogged with dust after long-term use, which will obstruct the flow of cooling air and drastically reduce the heat dissipation effect of the drive motor, and in severe cases, cause the motor to overheat. At the same time, during the flight of the drone, dust will continuously accumulate on its outer surface, sensor windows, heat dissipation grilles and other parts, affecting the accuracy of the sensors and the overall heat dissipation efficiency of the drone. Summary of the Invention

[0005] This application provides a rainproof and dustproof multi-rotor drone, which solves the problem that dust accumulates continuously on the drone and dustproof net after long-term use, affecting heat dissipation.

[0006] The technical solution adopted in the embodiments of this application is as follows: In a first aspect, embodiments of this application provide a rainproof and dustproof multi-rotor drone, comprising a fuselage, multiple arms fixedly connected to the outer surface of the fuselage, wings fixed to the ends of the arms, a sealing cover fixedly connected to the upper side of each wing, and a waterproof box fixedly connected to the lower side of each wing. A through hole is provided on each wing, connecting the sealing cover and the waterproof box. A cross-shaped support block for mounting a drive motor is fixed within the through hole. The output axis of the drive motor extends upward and is fixedly fitted with a propeller. A dustproof net is provided inside the waterproof box. The application also includes components disposed on the fuselage... The device includes an internal cavity-type airflow acoustic generator, an acoustic waveguide network connected to the outlet of the cavity-type airflow acoustic generator, multiple radiation holes opened on the acoustic waveguide network, a compressed air tank for supplying compressed air to the cavity-type airflow acoustic generator, and a control unit that controls the cavity-type airflow acoustic generator to operate in a frequency conversion scanning mode after the drone lands and the motor stops. The acoustic waveguide network is distributed inside the body and arm, and the radiation holes face the outer surface of the body and arm. The cavity-type airflow acoustic generator only operates when the drone is stopped.

[0007] By adopting the above technical solution, after the UAV completes its flight mission, lands, and the motors completely stop, the control unit automatically activates the cavity-type airflow acoustic wave generator. High-pressure gas in the compressed air tank drives the generator to produce high-intensity sound waves. These sound waves are transmitted through a network of ducts distributed inside the fuselage and arms, and ultimately radiate outwards from multiple radiation holes facing the outer surface of the fuselage and arms. These sound waves cause the dust adhering to the UAV's shell, arms, dustproof netting, and other parts to vibrate under pressure. The acceleration gained by the dust particles is sufficient to overcome their adhesion to the surface, thus causing them to peel off and fall off. Because the acoustic wave generator only operates when the UAV is stopped, electromagnetic interference to the flight control sensors and communication system during flight is completely avoided. Simultaneously, the frequency conversion scanning mode can cover the resonant frequencies of dust particles of different sizes, achieving automatic dust removal after shutdown and reducing the impact of accumulated dust.

[0008] In one alternative implementation, each of the waterproof boxes has a window on its outer wall, and a hinged, outwardly rotatable window panel is attached to the window. A shape memory alloy spring is connected to the inner side of the window panel via a hook. The other end of the shape memory alloy spring is fixed to the inner wall of the window panel. When the temperature is below a set value, the shape memory alloy spring is in a contracted state and pulls the window panel closed. When the temperature is above the set value, it extends and pushes the window panel open.

[0009] By adopting the above technical solution, when the dustproof net remains unobstructed, the motor operates at a normal temperature, and the internal temperature of the waterproof box is lower than the phase change temperature of the memory alloy spring. The spring is in a contracted state, and the window panel is pulled tight and closed, ensuring that all air entering the sealed enclosure is filtered by the dustproof net, achieving a good dustproof effect. When the dustproof net gradually becomes clogged due to long-term use, the cooling airflow through the net decreases, the motor's heat dissipation deteriorates, and the temperature inside the sealed enclosure and waterproof box continues to rise. Once the temperature exceeds the set phase change value of the memory alloy spring, the spring automatically extends, overcoming the weight of the window panel and hinge friction, pushing the window panel outwards to form an auxiliary air intake or exhaust channel on the side wall of the waterproof box. This channel allows external cold air to bypass the clogged dustproof net and directly enter the waterproof box, or allows internal hot air to be quickly exhausted, thereby ensuring that the motor receives sufficient cooling airflow, preventing motor overheating and damage, and improving the safety of the drone during long-term operation in harsh environments.

[0010] In one alternative implementation, a coaxial drive shaft extends in the opposite direction from the lower end of the output shaft of each drive motor. Several swing arms are hinged to the drive shaft, and a lightweight counterweight is fixed to the end of each swing arm. A thin line is connected to the lightweight counterweight, and the thin line passes downward through the dustproof net and is connected to a rubber rod located below the dustproof net.

[0011] By adopting the above technical solution, during the drone's flight, the drive motor rotates at high speed, driving the transmission shaft and the swing arm hinged to the transmission shaft to rotate synchronously. A lightweight counterweight at the end of the swing arm is thrown outwards under centrifugal force, pulling a thin line downwards. The line passes through the dustproof net and pulls a rubber rod located below the net downwards, causing the rubber rod to leave the lower surface of the net. At this time, the dustproof net is in an unobstructed ventilation state, not affecting normal heat dissipation during flight. When the drone lands and the motor speed gradually decreases, the centrifugal force decreases accordingly. When the centrifugal force is less than the weight of the rubber rod itself and the elastic force of the return torsion spring, the thin line slackens, and the rubber rod quickly rebounds upwards under the action of gravity or the torsion spring, impacting the lower surface of the dustproof net. The mechanical vibration generated by this impact forces the dust embedded in the mesh of the dustproof net and the dust adhering to the net surface to be dislodged, achieving a self-cleaning effect for the dustproof net.

[0012] In one alternative implementation, a buffer spring is provided at the connection between the thin line and the lightweight counterweight, the buffer spring being used to absorb the instantaneous impact force generated on the thin line when the swing arm opens outward.

[0013] By adopting the above technical solution, when the drone starts from a standstill, the motor speed rapidly increases from zero in a very short time, and the boom swings violently outward from its retracted state under the action of centrifugal force. Without a buffering measure, the thin line would directly bear the instantaneous impact tension generated by the boom and the counterweight, which could easily lead to fatigue fracture or detachment of the connection point over long-term use. By introducing a buffer spring at the connection point, the spring first absorbs and buffers most of the impact energy, allowing the tension on the thin line to rise gradually, reducing stress concentration and peak impact. At the same time, during the process of the motor stopping and the boom retracting, the buffer spring also plays a role in smooth reset, reducing the reverse impact on the thin line, thereby improving the fatigue life of the thin line and extending its service life.

[0014] In one alternative implementation, the dustproof mesh has an annular notch coaxial with the drive shaft, and the thin thread passes through the annular notch.

[0015] By adopting the above technical solution, a circular notch coaxial with the drive shaft is opened in the central area of ​​the dustproof net. The thin line can pass freely through this notch, and as the swing arm rotates, the thin line can move freely in the circumferential direction within the circular notch without any obstruction. The diameter of the circular notch is designed to accommodate the radial displacement of the thin line caused by the swing arm, achieving the effect of allowing the thin line to rotate without interference.

[0016] In one alternative implementation, an elastic lip seal is fixed to the upper and lower surfaces of the annular notch, and the two elastic lip seals form a double lip seal in their natural state.

[0017] By adopting the above technical solution, an elastic lip sealing sheet is fixed on the upper and lower surfaces of the annular notch, respectively. The two sealing sheets naturally contact and adhere to each other, forming a self-sealing structure. When a thin thread passes between the two sealing sheets, the elastic lip sheet wraps around the thread while maintaining contact pressure. Due to the good elasticity of the sealing sheet, even during the rotational movement of the thread, the lip sheet can deform according to the positional changes of the thread, thus compensating for the reduced dustproof performance caused by the annular notch.

[0018] In one alternative implementation, the surface of the resilient lip seal is coated with a low-friction coating.

[0019] By employing the above technical solution, a low-friction coating is applied to the surface of the sealing plate, significantly reducing the frictional resistance and wear rate between the wire and the sealing plate. This coating has self-lubricating properties, allowing the wire to slide smoothly while protecting the surface integrity of the sealing plate. The reduction in frictional resistance also reduces the additional energy consumption of the drive motor to overcome the friction of the wire, minimizing the negative impact on flight endurance and achieving the effect of reduced friction.

[0020] In one alternative implementation, the top of the sealing cover has multiple vent holes, which are inclined toward the propeller.

[0021] By adopting the above technical solution, multiple vents are opened at the top of the sealing cover, providing a direct channel for hot air to escape. The outward-sloping design prevents rainwater from falling directly into the vents under gravity. Even if a small amount of rainwater splashes onto the opening, it will be blown away by the combined effect of the tilt angle and the propeller airflow, preventing it from entering the sealing cover. This effectively reduces the risk of overheating while maintaining the overall waterproof and dustproof performance of the sealing cover.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. The resonant cavity acoustic generator automatically starts after the drone stops, radiating frequency-converted sound waves to the entire body through the conduit network, causing the attached dust to vibrate and fall off, eliminating the need for manual cleaning and significantly improving the continuous operation capability and ease of use in high dust environments; 2. By using a shape memory alloy spring to sense the temperature rise caused by the blockage of the dustproof mesh, the waterproof box window is automatically pushed open to form an auxiliary air duct, ensuring that the motor receives sufficient cooling airflow, effectively preventing overheating damage, and improving the safety of long-term operation in harsh environments; 3. Utilizing the disappearance of centrifugal force when the motor stops, the driving rubber rod automatically impacts the dustproof net, forcibly removing the dust accumulated in the mesh through mechanical vibration. The structure is simple and reliable, achieving self-cleaning of the dustproof net and extending the maintenance-free cycle. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a rainproof and dustproof multi-rotor drone.

[0024] Figure 2 This is a schematic diagram of the internal structure of the waterproof box.

[0025] Figure 3 This is a schematic diagram of the acoustic waveguide.

[0026] Explanation of reference numerals in the attached drawings: 1. fuselage; 2. arm; 3. wing; 4. sealing cover; 5. waterproof box; 6. propeller; 7. vent; 8. window panel; 9. shape memory alloy; 10. drive shaft; 11. swing arm; 12. counterweight; 13. thin line; 14. dustproof net; 15. rubber rod; 16. sealing plate; 17. radial hole. Detailed Implementation

[0027] The present application will be further described in detail below with reference to all the accompanying drawings in the embodiments of the present application.

[0028] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after the connection. It should be understood that when component A is fixedly connected to component C via component B, changes in the relative positional relationship due to deformation of components A, B, and C are permissible. The integrated structure obtained by the two components through a one-piece molding process means that during the formation of one of the two components, that component is connected to the other component, without requiring further processing (such as bonding, welding, snap-fit ​​connections, or screw connections) to connect the two components.

[0029] The directional terms mentioned in the embodiments of this application, such as "upper", "lower", "side", etc., are only for reference to the direction of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0030] The term "multiple" refers to at least two. The term "more than" includes the stated number. The term "and / or" describes a relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0031] This application discloses a rainproof and dustproof multi-rotor drone.

[0032] Reference Figure 1 A rainproof and dustproof multi-rotor drone includes a streamlined body 1 with a hollow interior to accommodate a flight control module, a power management module, a communication module, and other electronic components.

[0033] Six arms 2 are fixedly connected to the outer surface of the fuselage 1 by fasteners. The arms 2 are hollow tubular structures that radiate outwards from the fuselage 1. Each arm 2 has a wing 3 fixedly connected to its end.

[0034] A sealing cover 4 is fixedly connected to the upper side of each wing 3. The sealing cover 4 is cylindrical, and its lower edge is sealed to the upper surface of the wing 3. Waterproofing and dustproofing are achieved through sealing rings.

[0035] A waterproof box 5 is fixedly connected to the underside of each wing 3. The waterproof box 5 is box-shaped, and its top opening is sealed to the underside of the wing 3.

[0036] A through hole is provided on the wing 3, which extends vertically through the wing 3 and its upper and lower ends are connected to the inner cavity of the sealing cover 4 and the inner cavity of the waterproof box 5, respectively. A cross support block is fixed on the inner wall of the through hole. The cross support block is composed of four support arms converging at the center. The outer ends of the support arms are fixedly connected to the inner wall of the through hole, and the central part is used to install the drive motor.

[0037] The drive motor housing is fixed to the upper outer surface of the cross support block with screws. The output shaft of the drive motor extends vertically upward, passes through the central opening at the top of the sealing cover 4, and a propeller 6 is fixedly connected to the top of the output shaft.

[0038] The top of the sealing cover 4 has multiple vent holes 7, which are all inclined toward the propeller 6. That is, the axis of each vent hole 7 is at an acute angle to the vertical direction and points toward the plane of rotation of the propeller 6.

[0039] Reference Figure 1 and Figure 2 The waterproof box 5 has a dustproof mesh 14 inside, which is surrounded by an elastic sealing ring and is slidably embedded in the guide groove on the inner wall of the waterproof box 5. The dustproof mesh 14 divides the inner cavity of the waterproof box 5 into upper and lower areas, with the upper area communicating with the through hole and the lower area communicating with the outside atmosphere.

[0040] Reference Figure 1 A vibrating cavity airflow acoustic generator is installed in the internal cavity of the body 1. The air inlet of the vibrating cavity airflow acoustic generator is connected to a compressed air tank through a high-pressure air pipe. The compressed air tank is also installed inside the body 1 and is made of carbon fiber wound composite material to store high-pressure compressed air.

[0041] The outlet of the cavity airflow acoustic wave generator is connected to an acoustic wave duct network, which consists of six flexible pipes distributed inside each hollow arm 2 and extending along the arm 2 to the vicinity of each wing 3.

[0042] Reference Figure 1 and Figure 3 Multiple radiation holes 17 are provided at different locations in the acoustic waveguide network. These radiation holes 17 face the outer surfaces of the body 1 and the arm 2, and are close to, as shown in the reference. Figure 2 , the outer wall of the waterproof box 5 of the dustproof net 14.

[0043] Reference Figure 1The fuselage 1 also contains a control unit, which is a functional module of the flight control system. Its input is connected to the stop signal output of the flight control system, and its output is connected to a solenoid valve, which is installed on the pipeline between the compressed air tank and the resonant airflow acoustic generator.

[0044] Reference Figure 1 and Figure 3 The control unit is configured to open the solenoid valve only after the drone has landed and the motor has completely stopped, so that the high-pressure gas in the compressed air tank enters the resonant airflow sonic generator, driving the generator to work in frequency conversion scanning mode to generate high-intensity sound waves. The sound waves are transmitted through the sound wave duct network and radiated outward from each radiation hole 17, thereby shaking off the dust attached to the outer surfaces of the body 1, arm 2, dustproof net 14, etc.

[0045] Reference Figure 1 and Figure 2 Each waterproof box 5 has a window on its outer wall. A window panel 8 is hinged to the edge of the window and can be flipped open outwards. A hook is fixed to the inner surface of the waterproof box 5, one end of a shape memory alloy 9 spring is hooked to the hook, and the other end of the shape memory alloy 9 spring is fixed to the inner wall of the waterproof box 5.

[0046] The shape memory alloy 9 spring is made of nickel-titanium alloy, and its phase change temperature is set at a value higher than the upper limit of the normal operating temperature of the drive motor. When the temperature inside the waterproof box 5 is lower than this set value, the shape memory alloy 9 spring is in a contracted state, pulling the window panel 8 tight and fitting it against the edge of the window to keep the window closed. When the dustproof net 14 is blocked, causing a decrease in cooling airflow and a rise in motor temperature that causes the temperature inside the waterproof box 5 to exceed the set value, the shape memory alloy 9 spring extends, overcoming the weight of the window panel 8 and the friction of the hinge, and pushes the window panel 8 outward, thereby forming an auxiliary air inlet or outlet on the side wall of the waterproof box 5, allowing external cold air to bypass the blocked dustproof net 14 and directly enter the waterproof box 5, or allowing hot air inside the sealing cover 4 to be quickly discharged.

[0047] Each drive motor's output shaft also extends a coaxial drive shaft 10 from its lower end, passing through the center hole of the cross support block and extending into the interior of the waterproof box 5. Two swing arms 11 are connected to the drive shaft 10.

[0048] Reference Figure 2Each swing arm 11 has one end hinged to the drive shaft 10 via a hinge pin, and the other end is a free end. A lightweight counterweight 12 is fixed to this free end to increase the centrifugal force of the swing arm 11. A thin line 13 is connected to each lightweight counterweight 12. The thin line 13 is made of high-strength, low-elongation fiber rope, such as Kevlar line or fishing line. The swing arm 11 is connected to the drive shaft 10 by a return spring.

[0049] One end of the thin line 13 is fixed to the lightweight counterweight 12, and the other end extends downward and passes through the dustproof net 14, and is then connected to a rubber rod 15 located below the dustproof net 14. The rubber rod 15 is cylindrical and made of rubber material with a certain degree of elasticity and hardness.

[0050] During flight, the drive motor rotates at high speed, and the transmission shaft 10 drives the swing arm 11 to rotate synchronously. The lightweight counterweight 12 is thrown outward under the action of centrifugal force, and the free end of the rubber rod 15 is pulled down by the thin line 13, causing the rubber rod 15 to swing downward and leave the lower surface of the dustproof net 14, thereby ensuring that the dustproof net 14 is in an unobstructed ventilation state during flight.

[0051] As the drone lands and the motor speed gradually decreases to near zero, the centrifugal force decreases accordingly. When the elastic force of the reset torsion spring exceeds the centrifugal force, the rubber rod 15 rebounds rapidly upward under the drive of the reset torsion spring, striking the lower surface of the dustproof net 14 and shaking off the dust adhering to the dustproof net 14.

[0052] An annular notch, coaxial with the drive shaft 10, is provided in the central area of ​​the dustproof net 14. The width of the annular notch is greater than the diameter of the thin wire 13, and its radius is designed to accommodate the radial displacement of the thin wire 13 when the swing arm 11 swings.

[0053] The thin line 13 passes through the annular gap and can move freely along the circumference of the annular gap when the swing arm 11 rotates without rubbing or snagging with the solid part of the dustproof net 14.

[0054] A layer of elastic lip seal 16 is fixed to the upper and lower surfaces of the annular notch, respectively. These two layers of elastic lip seal 16 are made of silicone and are annular in shape.

[0055] As the thin wire 13 passes through, the lips of the two sealing sheets 16 wrap around the outer surface of the thin wire 13 while maintaining contact pressure between them, thereby effectively preventing dust from leaking out from the annular notch. A polytetrafluoroethylene coating is applied to the surface of the elastic lip sealing sheet 16.

[0056] The implementation principle of a rainproof and dustproof multi-rotor UAV according to an embodiment of this application is as follows: A cavity-type acoustic generator produces variable-frequency sound waves when the drone is stopped, which are radiated to the outer surface of the fuselage through a duct network, causing dust to vibrate and fall off. Simultaneously, a shape memory alloy senses temperature rise and automatically opens the window panel 8 to form an emergency heat dissipation channel. Furthermore, when the motor stops, the centrifugal force disappears, driving a rubber rod 15 to strike the dustproof net 14 for mechanical dust removal. These three elements work together to maintain a sealed dustproof environment during flight and automatically clean the drone after landing, significantly improving the UAV's continuous operation capability and reliability in harsh environments.

[0057] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other, and any combination of features in different embodiments is also within the protection scope of this application. That is to say, the multiple embodiments described above can also be arbitrarily combined according to actual needs.

[0058] It should be noted that all the above-mentioned figures are exemplary illustrations of this application and do not represent the actual size of the product. Furthermore, the dimensional proportions between the components in the figures are not intended to limit the actual product of this application. The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rainproof and dustproof multi-rotor unmanned aerial vehicle (UAV), comprising a body (1), multiple arms (2) fixedly connected to the outer surface of the body (1), wings (3) fixedly connected to the ends of the arms (2), a sealing cover (4) fixedly connected to the upper side of each wing (3), and a waterproof box (5) fixedly connected to the lower side of each wing (3), wherein the wing (3) has a through hole connecting the sealing cover (4) and the waterproof box (5), a cross support block for installing a drive motor is fixed in the through hole, the output axis of the drive motor extends upward and a propeller (6) is fixed thereon, and a dustproof net (14) is provided inside the waterproof box (5), characterized in that: It also includes a cavity airflow acoustic generator disposed inside the body (1), an acoustic wave duct network connected to the outlet of the cavity airflow acoustic generator, a plurality of radiation holes (17) opened on the acoustic wave duct network, a compressed air tank for supplying compressed air to the cavity airflow acoustic generator, and a control unit for controlling the cavity airflow acoustic generator to operate in frequency conversion scanning mode after the UAV lands and the motor stops. The acoustic wave duct network is distributed inside the body (1) and the arm (2), and the radiation holes (17) face the outer surfaces of the body (1) and the arm (2). The cavity airflow acoustic generator only operates when the UAV is stopped.

2. The rainproof and dustproof multi-rotor drone as described in claim 1, characterized in that: Each of the waterproof boxes (5) has a window on its outer wall, and a window panel (8) that can be flipped outward is hinged to the window. A shape memory alloy (9) spring is connected to the inner side of the window panel (8) by a hook. The other end of the shape memory alloy (9) spring is fixed to the inner wall of the window panel (8). When the temperature is lower than the set value, the shape memory alloy (9) spring is in a contracted state and pulls the window panel (8) closed. When the temperature is higher than the set value, it extends and pushes the window panel (8) open.

3. The rainproof and dustproof multi-rotor drone as described in claim 1, characterized in that: Each of the drive motors has a coaxial transmission shaft (10) extending from the lower end of its output shaft. Several swing arms (11) are hinged to the transmission shaft (10). A lightweight counterweight (12) is fixed to the end of each swing arm (11). A thin line (13) is connected to the lightweight counterweight (12). The thin line (13) passes downward through the dustproof net (14) and is connected to a rubber rod (15) located below the dustproof net (14).

4. A rainproof and dustproof multi-rotor drone as described in claim 3, characterized in that: A buffer spring is provided at the connection between the thin line (13) and the lightweight counterweight (12). The buffer spring is used to absorb the instantaneous impact force generated on the thin line (13) when the swing arm (11) opens outward.

5. A rainproof and dustproof multi-rotor drone as described in claim 3, characterized in that: The dustproof net (14) has an annular notch coaxial with the drive shaft (10), and the thin line (13) passes through the annular notch.

6. A rainproof and dustproof multi-rotor drone as described in claim 5, characterized in that: The upper and lower surfaces of the annular notch are respectively fixed with a layer of elastic lip seal (16), and the two layers of elastic lip seal (16) form a double lip seal in the natural state.

7. A rainproof and dustproof multi-rotor drone as described in claim 6, characterized in that: The surface of the elastic lip seal (16) is coated with a low-friction coating.

8. A rainproof and dustproof multi-rotor drone as described in claim 1, characterized in that: The top of the sealing cover (4) is provided with a plurality of vent holes (7), which are inclined toward the propeller (6).

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