Unmanned aerial vehicle rotor wing silencer

Abstract

The utility model relates to an unmanned aerial vehicle rotor wing silencer which comprises a first supporting shell, a second supporting shell and a sound absorption unit. The first supporting shell and the second supporting shell are fixedly arranged on a rotor wing of the unmanned aerial vehicle in a clamped mode, the sound absorption units are bonded to the inner surface of the first supporting shell and the inner surface of the second supporting shell, and each sound absorption unit is of a porous structure. The device has the advantages of being simple in structure and easy to install, the sound absorption unit is of a porous structure, noise generated by the rotor wings can be effectively absorbed and reduced when the unmanned aerial vehicle flies, and the device has the advantages of being environmentally friendly, silencing and free of delay.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental protection noise reduction and silencing, and particularly relates to a drone rotor silencer. Background Art

[0002] With the popularization of drones in the civilian field, it is becoming more and more common to encounter situations where drones are taking pictures or transporting nearby. While drones enrich and facilitate our lives, they also cause many problems, and noise pollution is a very serious one. In order to improve the flight speed and endurance of drones, rotating machinery is continuously strengthened and the overall weight is reduced, which leads to a continuous increase in the noise of propeller wings. For those engaged in drone-related work, being in a high-noise environment for a long time first affects the loss of human hearing and then causes various ear diseases, which in turn leads to psychological diseases such as anxiety and irritability, seriously endangering people's physical and mental health. Moreover, when performing surveys that require extremely low noise, the noise of propeller wings can easily lead to the failure of the survey task.

[0003] Although a variety of silencing devices have been proposed, these devices have problems such as complex structures that increase the body weight, or complex operations that are not easy to master, or there is a silencing lag and they cannot well meet the requirements of environmental protection and silencing. Content of the Utility Model

[0004] In order to solve the above problems existing in the prior art, the utility model provides a drone rotor silencer. The technical problems to be solved by the utility model are realized through the following technical solutions:

[0005] The utility model provides a drone rotor silencer, including: a first support housing, a second support housing and a sound-absorbing unit; the first support housing and the second support housing are fixedly clamped on the rotor of the drone, and the sound-absorbing unit is adhered to the inner surfaces of both the first support housing and the second support housing, and the sound-absorbing unit has a porous structure.

[0006] In some embodiments, a plurality of clamping grooves are uniformly formed on the clamping surface of the first support housing, and a plurality of clamping buckles are uniformly formed on the clamping surface of the second support housing; the positions of the plurality of clamping buckles correspond to the positions of the plurality of clamping grooves one by one.

[0007] In some embodiments, the rotor of the drone includes: a plurality of rotor blades, a hub, and a rotor shaft; the plurality of rotor blades are movably mounted on the hub, the hub is disposed on the rotor shaft, and the rotor shaft is connected to the fuselage of the drone; a plurality of support rods and a fitting layer are installed inside the second support housing; the fitting layer is used for clamping on the rotor shaft; one end of each support rod is fixed on the outer surface of the fitting layer, and the other end is fixed on the inner surface of the second support housing.

[0008] In some embodiments, a hole is formed in the second support housing to allow the rotor of the drone to extend into the interior of the second support housing; and, a movable door is provided on the second support housing, and the movable door can move circumferentially along the second support housing to cover or expose the hole.

[0009] In some embodiments, the movable door includes: a spring and a door panel; one end of the spring is fixed on the inner surface of the second support housing, and the other end is fixedly connected to the door panel; when the spring is stretched circumferentially along the second support housing, it pushes the door panel to cover the hole; when the spring is compressed circumferentially along the second support housing, it pulls the door panel away from the hole, and the hole is exposed.

[0010] In some embodiments, the sound absorption unit includes: a first sound absorption unit and a second sound absorption unit; the first sound absorption unit is adhered to the inner surface of the first support housing, and the second sound absorption unit is adhered to the inner surface of the second support housing.

[0011] In some embodiments, the sound absorption unit is sound-absorbing cotton.

[0012] In some embodiments, the two-dimensional cross-section of the first support housing is semi-circular or semi-elliptical, and the top of the first support housing is hollowed out.

[0013] In some embodiments, the two-dimensional cross-section of the first sound absorption unit is semi-circular or semi-elliptical.

[0014] In some embodiments, the two-dimensional cross-section of the second support housing is funnel-shaped.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: Aiming at the problems of the existing noise elimination device having a complex structure that increases the weight of the fuselage, or being complex to operate and not easy to start, or having a noise elimination lag and not being able to well meet the environmental protection noise elimination requirements, the present utility model provides a drone rotor muffler. The drone rotor muffler includes a first support housing, a second support housing, and a sound absorption unit, and has the characteristics of simple structure and easy installation. Moreover, the sound absorption unit is a porous structure, which can effectively absorb and reduce the noise generated by the rotor when the drone is flying, and has the advantages of environmental protection and no noise elimination lag. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the structural composition of the drone rotor muffler provided by the present utility model;

[0017] Figure 2 is an installation schematic diagram of the first support housing and the second support housing provided by the present utility model;

[0018] Figure 3 is a schematic diagram of the internal air flow trend of the drone rotor muffler provided by the present utility model;

[0019] Figure 4 is a schematic diagram of the internal composition of the second support housing provided by the present utility model.

[0020] Reference Signs:

[0021] 1. First support housing; 2. Second support housing; 3. Sound absorption unit; 4: Rotor; 11. Clamping groove; 21. Movable door; 22. Support rod; 23. Fitting layer; 24. Buckle; 31. First sound absorption unit; 32. Second sound absorption unit; 41. Rotor blade; 42. Rotor hub; 43. Rotor shaft; 211. Spring; 212. Door panel; 221. First support rod; 222. Second support rod; 223. Third support rod; 224. Fourth support rod; 225. Fifth support rod. Detailed Description of the Preferred Embodiments

[0022] The following further describes the present utility model in detail with reference to specific embodiments, but the implementation manners of the present utility model are not limited thereto.

[0023] Now, with reference to the accompanying drawings, the drone rotor muffler proposed by the present utility model will be described in detail. Figure 1 is a schematic diagram of the structural composition of the drone rotor muffler provided by the present utility model; Figure 2 is an installation schematic diagram of the first support housing and the second support housing provided by the present utility model; Figure 3 is a schematic diagram of the internal air flow trend of the drone rotor muffler provided by the present utility model; Figure 4 is a schematic diagram of the internal composition of the second support housing provided by the present utility model. It should be noted that, for clearly seeing the composition structure of the drone rotor muffler, Figures 1 to 3 the sound absorption unit in

[0024] such as Figure 1As shown in the figure, the drone rotor muffler includes: a first support housing 1, a second support housing 2, and a sound absorption unit 3; the first support housing 1 and the second support housing 2 are fixedly clamped on the rotor 4 of the drone, and the sound absorption unit 3 is adhered to the inner surfaces of both the first support housing 1 and the second support housing 2. The sound absorption unit 3 has a porous structure.

[0025] Here, the drone rotor muffler is provided on one rotor of the drone. Assuming the drone has 4 rotors, the corresponding number of drone rotor mufflers is 4.

[0026] Here, the two-dimensional cross-section of the first support housing 1 is semi-circular or semi-elliptical, and the top of the first support housing 1 is hollowed out. The two-dimensional cross-section of the second support housing 2 is funnel-shaped. This design can increase the installation area of the sound absorption unit inside the housing to enhance the sound absorption effect.

[0027] Please refer to Figure 2 , a plurality of clamping grooves 11 are evenly opened on the clamping surface of the first support housing 1, and a plurality of clamping buckles 24 are evenly opened on the clamping surface of the second support housing 2; the positions of the plurality of clamping buckles 24 correspond one by one to the positions of the plurality of clamping grooves 11. Through the clamping of the plurality of clamping buckles 24 and the plurality of clamping grooves 11, the first support housing 1 and the second support housing 2 are fixedly connected together. If it is necessary to replace the first support housing 1 or the second support housing 2, only the clamping connection between the plurality of clamping buckles 24 and the plurality of clamping grooves 11 needs to be released.

[0028] Here, the preparation materials of both the first support housing 1 and the second support housing 2 are polyethylene. Polyethylene has the advantage of extremely light weight, which can protect the shape of the housing from deformation while reducing the weight of the drone. Moreover, the design of the two housings can also reduce external wind resistance and lower the additional power consumption of the drone.

[0029] Please continue to refer to 1 to Figure 3 , the sound absorption unit 3 is sound-absorbing cotton. The sound absorption unit 3 includes: a first sound absorption unit 31 and a second sound absorption unit 32; the first sound absorption unit 31 is adhered to the inner surface of the first support housing 1, and the second sound absorption unit 32 is adhered to the inner surface of the second support housing 2. Here, the two-dimensional cross-section of the first sound absorption unit 31 is semi-circular or semi-elliptical. It should be noted that both the first sound absorption unit 31 and the second sound absorption unit 32 are integrally formed. Among them, at the hollowed-out part at the top of the first support housing 1, to ensure the sound absorption effect of the first sound absorption unit 31, the thickness of the first sound absorption unit provided at the hollowed-out part at the top of the first support housing 1 is increased.

[0030] Please continue to refer to 1 to Figure 3When the rotor 4 of the UAV is in working state, air enters from the first sound absorbing unit 31 at the top hollow of the first supporting shell 1, and is discharged from the bottom of the second supporting shell 2 along the inner surface of the first supporting shell 1 and the inner surface of the second supporting shell 2. This method can minimize the airflow attenuation, effectively make up for the deficiency of the rotor wind force weakening, reduce the power consumption during flight, and effectively shorten the flight time and increase the flight speed while reducing the rotor noise.

[0031] Please refer to Figure 4 The second support shell 2 is provided with a hole (not shown in the figure) that allows the rotor 4 of the drone to extend into the interior of the second support shell 2; and the second support shell 2 is provided with a movable door 21, which can move along the circumference of the second support shell 2 to cover or expose the hole.

[0032] Here, the movable door 21 includes: a spring 211 and a door plate 212; one end of the spring 211 is fixed to the inner surface of the second supporting shell 2, and the other end is fixedly connected to the door plate 212; when the spring 211 is stretched along the circumference of the second supporting shell 2, the door plate 212 is pushed to cover the hole; when the spring 211 is compressed along the circumference of the second supporting shell 2, the door plate 212 is pulled away from the hole, and the hole is exposed.

[0033] Please continue to refer to Figure 1 and Figure 4 The rotor 4 of the UAV includes: a plurality of rotor blades 41, a hub 42 and a rotor shaft 43; a plurality of rotor blades 41 are movably mounted on the hub 42, the hub 42 is arranged on the rotor shaft 43, and the rotor shaft 43 is connected to the fuselage of the UAV (not shown in the figure); a plurality of support rods 22 and a bonding layer 23 are installed in the second support shell 2; the bonding layer 23 is used to be clamped on the rotor shaft 43; one end of each support rod 22 is fixed to the outer surface of the bonding layer 23, and the other end is fixed to the inner surface of the second support shell 2. Specifically, in order to further ensure that the rotor shaft 43 will not be separated from the bonding layer 23, a double-sided adhesive is pasted on the bonding layer 23, and the bonding layer 23 and the rotor shaft 43 are further fixed by the double-sided adhesive to ensure that the UAV rotor 4 will not loosen in the UAV rotor muffler.

[0034] It should be noted that each support rod 22 is obliquely disposed in the second support shell 2 to support the bonding layer 23 located at the center of the second support shell 2. The inclination angle of each support rod 22 can be set according to actual needs.

[0035] To verify the noise reduction effect of the UAV rotor muffler provided by the present utility model, an experiment was conducted by installing the UAV rotor muffler provided by the present utility model on existing UAV products on the market (for example, DJI Mavic Pro). The comparison of the UAV rotor noise data before installing the UAV rotor muffler and the UAV rotor noise data after installing the UAV rotor muffler is shown in Table 1 below. By comparing the UAV rotor noise data before and after installing the UAV rotor muffler in Table 1, it can be seen that the UAV rotor muffler provided by the present utility model can effectively reduce the UAV rotor noise.

[0036] Table 1

[0037]

[0038] In one embodiment, the user pushes the spring on the UAV rotor muffler to rotate the spring circumferentially along the shell of the UAV rotor muffler to expose the hole provided on the shell. One end of the rotor shaft of the UAV rotor passes through the hole and extends into the interior of the UAV rotor muffler to be clamped on the inner fitting layer, and double-sided tape is used to reinforce the connection between the fitting layer and the rotor shaft; four UAV rotor mufflers are respectively installed on the rotors of the UAV, the control power supply of the UAV is turned on, and the blades on the UAV rotor are driven to rotate and the rotor shaft is twisted by a specific angle to travel from location A to location B. Among them, when the UAV rotor is working, air enters from the top of the shell of the UAV rotor muffler and then flows out from the bottom of the shell of the UAV rotor muffler. And a part of the noise sound wave generated by the UAV rotor will be directly absorbed by the sound absorption unit, and a part passes through the sound absorption unit and reaches the muffler shell. The shell is made of polyethylene plastic shell, which has high hardness and strength, and the sound wave will be reflected back when it collides with it. During the process of being reflected back, it passes through the sound absorption unit again, and the sound wave is weakened again. After passing through the sound absorption unit, the sound wave continuously reflects in the chamber and continuously collides with the wall of the device, and finally the sound energy is converted into heat energy. And based on the necking design of the UAV rotor muffler, very few sound waves can propagate outward, and the external manifestation is that the sound is significantly weakened.

[0039] In view of the problems of the existing noise elimination device, such as complex structure increasing the body weight, or complex operation and not being easy to operate, or there being a lag in noise elimination and not being able to well meet the environmental protection noise elimination requirements, the utility model provides a drone rotor muffler. The drone rotor muffler includes a first support housing, a second support housing and a sound absorption unit. The drone rotor muffler is fixed on the drone rotor by buckling the first support housing and the second support housing on the drone rotor shaft, and has the characteristics of simple structure and easy installation. Moreover, when the drone is flying, the drone rotor muffler can make the noise sound waves reflect multiple times inside the muffler, and in each reflection process, the sound absorption unit arranged inside the housing is used to absorb and attenuate the noise energy, effectively reducing the noise generated by the rotor, and having the advantages of environmental protection and no lag in noise elimination.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0041] The above description shows and describes several preferred embodiments of the utility model. However, as mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept of the utility model herein through the above teachings or the technology or knowledge in the relevant field. And any changes and variations made by those skilled in the art without departing from the spirit and scope of the utility model shall fall within the protection scope of the appended claims of the utility model.

Claims

1. A UAV rotor muffler, characterized in that: include: A first supporting shell, a second supporting shell and a sound absorbing unit; The first supporting shell and the second supporting shell are fixedly mounted on the rotor of the UAV, and the inner surface of the first supporting shell and the inner surface of the second supporting shell are both bonded with the sound absorbing unit, and the sound absorbing unit is a porous structure.

2. The UAV rotor silencer according to claim 1, characterized in that: A plurality of snap-fit ​​grooves are evenly arranged on the snap-fit ​​surface of the first support shell, and a plurality of buckles are evenly arranged on the snap-fit ​​surface of the second support shell; the arrangement positions of the plurality of buckles correspond one-to-one to the arrangement positions of the plurality of snap-fit ​​grooves.

3. The UAV rotor silencer according to claim 1, characterized in that: The rotor of the UAV comprises: a plurality of rotor blades, a propeller hub and a rotor shaft; the plurality of rotor blades are movably mounted on the propeller hub, the propeller hub is arranged on the rotor shaft, and the rotor shaft is connected to the fuselage of the UAV; A plurality of support rods and a bonding layer are installed in the second support shell; the bonding layer is used to be clamped on the rotor shaft; one end of each support rod is fixed to the outer surface of the bonding layer, and the other end is fixed to the inner surface of the second support shell.

4. The UAV rotor silencer according to claim 1, characterized in that: The second support shell is provided with a hole allowing the rotor of the drone to extend into the interior of the second support shell; and the second support shell is provided with a movable door, which can move along the circumference of the second support shell to cover or expose the hole.

5. The UAV rotor silencer according to claim 4, characterized in that: The movable door comprises: a spring and a door plate; one end of the spring is fixed to the inner surface of the second supporting shell, and the other end is fixedly connected to the door plate; When the spring is stretched along the circumference of the second supporting shell, the door plate is pushed to cover the hole; when the spring is compressed along the circumference of the second supporting shell, the door plate is pulled away from the hole, and the hole is exposed.

6. The UAV rotor silencer according to claim 1, characterized in that: The sound absorbing unit includes: a first sound absorbing unit and a second sound absorbing unit; the first sound absorbing unit is bonded to the inner surface of the first supporting shell, and the second sound absorbing unit is bonded to the inner surface of the second supporting shell.

7. The UAV rotor silencer according to claim 1, characterized in that: The sound absorbing unit is sound absorbing cotton.

8. The UAV rotor silencer according to claim 1, characterized in that: The two-dimensional cross-section of the first supporting shell is semicircular or semi-elliptical, and the top of the first supporting shell is hollow.

9. The UAV rotor silencer according to claim 6, characterized in that: The two-dimensional cross section of the first sound absorbing unit is semicircular or semi-elliptical.

10. The UAV rotor silencer according to claim 1, characterized in that: The two-dimensional cross section of the second supporting shell is funnel-shaped.

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