Rotor wing structure with good noise reduction effect and aerocar

Abstract

The invention relates to the field of rotors, in particular to a rotor structure with a good noise reduction effect and an aerocar. The rotor structure with the good noise reduction effect comprises bionic protrusions and a rotor body, each bionic protrusion comprises a rotating side and a round corner side, the rotating sides are connected with a driving structure, the round corner sides make contact with springs, and the bionic protrusions are arranged at the tail end of the rotor body in an array mode; rotor wing holes used for containing the bionic protrusions and the springs are further distributed in the rotor wing body in an array mode. The bionic protrusions can stretch out at a low speed, so that noise reduction is conducted on the rotor wings, the bionic protrusions are retracted at a high speed, noise of the aerocar can be reduced, sound pollution is reduced, and the aerocar has wide application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of rotor wind noise, and in particular to a rotor structure and a flying vehicle with good noise reduction effect. Background Art

[0002] Traffic congestion and the development of automation technology have led to the rapid development of research on urban air mobility (UAM), and the rotor is an important part of the flying car. The movement of the rotor in the air will produce complex flow phenomena, such as turbulence and vortices, which will cause changes in air pressure and thus generate noise. In order to meet the public's comfort requirements and popularize flying cars in the future, it is necessary to reasonably design the rotor structure to achieve noise reduction.

[0003] At present, there are many studies on airfoil noise reduction. Drawing on the structure, function and mechanism of organisms in the biological world for bionic noise reduction is an emerging method that has attracted much attention. Existing bionic noise reduction structures mainly include trailing edge serrations, leading edge waves, leading edge protrusions and surface grooves. The noise reduction effect of these structures is highly correlated with the additional noise generated by the structure itself and the rotor speed. Some structures can only reduce noise under specific working conditions, and may increase noise when the working conditions change. Summary of the invention

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A rotor structure with good noise reduction effect comprises a bionic protrusion and a rotor body, wherein the bionic protrusion comprises a rotating side and a rounded side, the rotating side is connected to a driving structure and the rounded side is in contact with a spring, an array of bionic protrusions is arranged at the tail end of the rotor body, and an array of rotor holes for placing the bionic protrusions and springs are distributed on the rotor body.

[0006] As a further solution of the present invention: the spring includes a spring platform and a spring body, the normal bounce length of the spring is greater than the length of the rotor hole, the longitudinal cross-sectional shapes of the rotor hole and the spring platform are both inverted T-shaped and have a clearance fit, the cross-sectional shape of the rotor hole is consistent with the cross-sectional shape of the raised part of the spring platform, and the spring can be stuck in the rotor hole when bouncing.

[0007] As a further solution of the present invention: the rounded corner side is in a chamfered shape to prevent wear, and the bionic protrusion is a fish fin-shaped protrusion.

[0008] As a further solution of the present invention, the cross-sectional shape of the rotor hole is consistent with the shapes of the two side surfaces of the bionic protrusion, ensuring that there is no obvious uneven structure on the rotor surface when the rotor rotates at high speed and is closed.

[0009] As a further solution of the present invention: the driving structure includes a rack, several gears and a rotating column, each gear is fixedly connected to a rotating column, the rack is meshed with the gear, and the rotating column is connected to the rotating side. When the rack translates, the gear, the rotating column and the bionic protrusion will rotate.

[0010] As a further solution of the present invention: the cross section of the rotor hole is consistent in shape with the raised portion of the spring platform, ensuring that there is no obvious uneven structure on the rotor surface when the rotor rotates at a low speed and the device is turned on.

[0011] A flying vehicle comprises a vehicle body and other equipment, and also comprises the above-mentioned rotor structure with good noise reduction effect.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The bionic protrusion can be opened and closed according to different rotor speeds, relying on the drive structure and springs. The influence of the speed on the rotor is taken into consideration to ensure that the aerodynamic noise can be minimized under different working conditions.

[0014] 2. The cross-sectional shape of the rotor hole is consistent with the shape of the raised portion of the spring platform, that is, when the bionic raised portion is opened, the remaining surface of the rotor can be guaranteed to be smooth without generating other eddies.

[0015] 3. The cross-sectional shape of the rotor hole is consistent with the shapes of the two side surfaces of the bionic protrusion, that is, when the bionic protrusion is retracted, the surface of the rotor can be guaranteed to be smooth without generating other vortices.

[0016] 4. The rounded corners of the bionic protrusions are set to be chamfered to ensure that when the rounded corners squeeze the spring, it will not leave much wear on the spring, thereby increasing its service life.

[0017] 5. The rotor hole and the spring platform are in an inverted T shape, and the normal spring-up length of the spring is greater than the length of the rotor hole. This ensures that when the bionic protrusion is opened, the protruding part of the spring platform can fit the rotor hole as closely as possible, further ensuring that the surface of the rotor is smooth and no other vortices are generated.

[0018] 6. The driving structure can drive the rotation of multiple gears, rotating columns and bionic protrusions only by the translational movement of one rack, which can ensure that all bionic protrusions are opened or closed at the same time and save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a rotor structure rotating at a low speed with good noise reduction effect in an embodiment of the present invention.

[0020] Figure 2 This is a structural diagram of a high-speed rotating rotor structure with good noise reduction effect in an embodiment of the present invention.

[0021] Figure 3This is a structural diagram of the driving structure used in the rotor structure with good noise reduction effect in an embodiment of the present invention.

[0022] Figure 4 Schematic diagram of the array shape of bionic protrusions in a rotor structure with good noise reduction effect in an embodiment of the present invention.

[0023] Figure 5 Schematic diagram of the effect of the bionic protrusion array on the total circumferential sound pressure level of the rotor in a rotor structure with good noise reduction effect at different rotation speeds in an embodiment of the present invention.

[0024] In the figure: 1-bionic protrusion, 11-rounded side, 12 rotating side, 2-rotor hole, 3-spring platform, 4-spring body, 5-rotor body, 6-rotating column, 7-gear, 8-rack. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0027] See also Figure 1-Figure 5 The embodiment of the present invention provides a rotor structure with good noise reduction effect, comprising a bionic protrusion 1 and a rotor body 5, wherein the bionic protrusion 1 is divided into a rounded side 11 and a rotating side 12, wherein the rotating side 12 is connected to the driving structure and the rounded side 11 is in contact with the spring, and the bionic protrusion 1 is arranged in an array at the tail end of the rotor body 5, and the rotor body 5 is also provided with rotor holes 2 for placing the bionic protrusion 1 and the spring in an array, such as Figure 4 and Figure 5 As shown, the height H, maximum width W and array spacing S of the bionic protrusion 1 can be designed according to different rotors. At a rotation speed of 3000 rpm, the airfoil equipped with the bionic protrusion 1 can almost achieve circumferential noise reduction compared to the basic airfoil; at a rotation speed of 5000 rpm, the bionic protrusion 1 will generate larger vortices, which will increase the noise sound pressure level at certain angles of the rotor.

[0028] As a preferred embodiment provided by the present invention, the driving structure includes a rotating column 6, a gear 7 and a rack 8, the spring includes a spring platform 3 and a spring body 4, the rotating side 12 of the bionic protrusion 1 is connected to the rotating column 6, and the rounded side 11 is chamfered to ensure that no wear is caused as much as possible when in contact with the spring platform 3, thereby improving the life of the structure.

[0029] As a preferred embodiment provided by the present invention, the rotor hole 2 is used to place the spring platform 3 and the spring body 4. The longitudinal cross-sectional shapes of the spring platform 3 and the rotor hole 2 are both inverted T-shaped and clearance-fitted. The cross-sectional shape of the rotor hole 2 is consistent with the cross-sectional shape of the raised part of the spring platform 3. The normal bounce length of the spring body 4 is greater than the length of the rotor hole 2. This can ensure that when the bionic protrusion 1 is opened at a low speed, the spring platform 3 can just fit into the rotor hole 2, reducing wear while ensuring that the rotor surface can remain smooth, which can reduce eddy currents. Preferably, the bionic protrusion 1 is a fish fin-shaped protrusion.

[0030] As a preferred embodiment provided by the present invention, the rounded side 11 can contact the spring platform 3 and can press the spring body 4 into the lower end of the rotor hole 2. The rotating side 12 of the bionic protrusion 1 is consistent with the shape of the rotor hole 2, ensuring that the rotor surface can remain smooth at high speed and reducing eddy currents.

[0031] As a preferred embodiment provided by the present invention, the gear 7 in the driving structure is fixedly connected to the rotating column 6, and the gear 7 is meshed with the rack 8. When the speed is switched, the rack 8 moves left and right in a translational manner, thereby driving the gear 7 and the rotating column 6 to rotate, and the rotating column 6 drives the bionic protrusion 1 to rotate.

[0032] The working principle of the present invention is:

[0033] When the rotor switches from high speed to low speed, the rack 8 translates to the left, which can drive the gear 7 and the rotating column 6 to rotate clockwise, thereby driving the bionic protrusion 1 to rotate out of the rotor hole 2 to the outer surface of the tail end of the rotor body 5, thereby achieving the effect of reducing wind noise. At the same time, the spring platform 3 and the spring body 4 are no longer squeezed by the bionic protrusion 1, and they bounce up from the bottom of the rotor hole 2 until they are stuck in the upper end of the rotor hole 2.

[0034] When the rotor switches from low speed to high speed, the rack 8 translates to the right, which can drive the gear 7 and the rotating column 6 to rotate counterclockwise, thereby driving the bionic protrusion 1 from the outer surface of the tail end of the rotor body 5 into the rotor hole 2, avoiding the bionic protrusion 1 from generating large eddy currents and noise at high speed. At the same time, the rounded side 11 of the bionic protrusion 1 will be squeezed with the spring platform 3 during the rotation process, and the spring platform 3 and the spring body 4 will be pressed into the lower end of the rotor hole 2 until the rotating side 12 and the upper surface of the rotor hole 2 are completely fitted.

[0035] A flying vehicle comprises a vehicle body and other equipment, and also comprises the above-mentioned rotor structure with good noise reduction effect.

[0036] It should be noted that in the present invention, unless otherwise clearly specified and limited, the terms "rotate", "fix", "have", etc. should be understood in a broad sense, for example, it can be a welding connection, a bolt connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A rotor structure with good noise reduction effect, comprising a bionic protrusion and a rotor body, characterized in that: The bionic protrusion includes a rotating side and a rounded side, the rotating side is connected to the driving structure and the rounded side is in contact with the spring, the bionic protrusion array is arranged at the tail end of the rotor body, and the rotor body is also provided with an array of rotor holes for placing the bionic protrusions and springs.

2. The rotor structure with good noise reduction effect according to claim 1, characterized in that: The spring comprises a spring platform and a spring body. The normal springing length of the spring is greater than the length of the rotor hole. The longitudinal cross-section shapes of the rotor hole and the spring platform are both inverted T-shape and have clearance fit.

3. The rotor structure with good noise reduction effect according to claim 1 or 2, characterized in that: The rounded side is a rounded shape.

4. The rotor structure with good noise reduction effect according to claim 1, characterized in that: The cross-sectional shape of the rotor hole is consistent with the shapes of the two side surfaces of the bionic protrusion.

5. The rotor structure with good noise reduction effect according to claim 2, characterized in that: The cross section of the rotor hole is consistent with the shape of the raised portion of the spring platform.

6. The rotor structure with good noise reduction effect according to claim 1 or 5, characterized in that: The driving structure comprises a rack, a plurality of gears and a rotating column, each gear is fixedly connected to a rotating column, the rack is meshed with the gear, and the rotating column is connected to the rotating side.

7. A flying car, comprising a car body and other equipment, characterized in that: It also includes a rotor structure with good noise reduction effect as described in any one of claims 1-6.

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