Blades, propellers and multicopter drones

Abstract

The utility model provides a kind of paddle, propeller, power assembly and multi-rotor unmanned aerial vehicle, wherein, paddle is applied to multi-rotor unmanned aerial vehicle, and it includes: main part;Soft piece, around the edge of main part, soft piece includes the first side with the main part forms the leading edge of paddle, the second side with the main part forms the tip of paddle, and the third side across the main part, the first side, the second side, the third side are the three edges of enclosed shape, improve the security of paddle.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a blade, propeller, power assembly, and multi-rotor UAV. Background Technology

[0002] Drone propellers are typically made of rigid, sharp blades. When these blades strike a person, they can easily cause injury, especially during rotation when the blades spin at high speeds, further increasing the risk of injury. To mitigate the impact, some propeller blades have protective edges; however, these edges are prone to slipping off the blades, rendering them ineffective. Utility Model Content

[0003] To address at least one of the aforementioned and other technical problems in the prior art, this utility model provides a blade, propeller, power assembly, and multi-rotor drone, which can effectively reduce the impact force of the blade on the human body and the injury to the human body, and improve the bonding strength between the soft parts and the main body, thereby reducing the risk of the soft parts slipping off.

[0004] The first aspect of this utility model provides a propeller blade for use in a multi-rotor unmanned aerial vehicle, comprising: a main body; and a flexible component surrounding an edge disposed on the main body, the flexible component including a first side forming a leading edge of the propeller blade with the main body, a second side forming a tip of the propeller blade with the main body, and a third side spanning the main body, wherein the first side, the second side, and the third side are three sides in an enclosing shape.

[0005] A second aspect of this invention provides a propeller for use in a multi-rotor unmanned aerial vehicle (UAV), the propeller comprising a hub and at least two blades mounted on the hub, the blades being of the type described above.

[0006] A third aspect of this utility model provides a multi-rotor unmanned aerial vehicle (UAV) including a fuselage, an arm, and the aforementioned propeller, wherein the root of the arm is mechanically coupled to the fuselage, and the propeller is connected to the end of the arm.

[0007] As shown in the illustrative embodiment of this utility model, a soft component is disposed around the edge of the main body. The first side of the soft component is disposed at the leading edge of the blade, and the second side is disposed at the tip of the blade. When the blade hits a person, the leading edge and tip of the blade exert a greater impact force. At this time, the soft component acts as a buffer, effectively reducing the impact force and thus mitigating injury. The third side of the soft component spans the main body, ensuring a tight bond between the soft component and the main body. This increases the contact area between the soft component and the main body, improves the bonding strength, and reduces the risk of slippage.

[0008] Additional aspects and further advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description. Attached Figure Description

[0009] Figure 1 This is a perspective view of a propeller blade according to an illustrative embodiment of the present invention;

[0010] Figure 2 This is a side view of a propeller blade according to an illustrative embodiment of the present invention;

[0011] Figure 3 This is a side view of a blade according to another illustrative embodiment of the present invention;

[0012] Figure 4 This is a partial cross-sectional view of a blade according to an illustrative embodiment of the present invention;

[0013] Figure 5 This is an exploded view of a propeller blade according to an illustrative embodiment of the present invention; and

[0014] Figure 6 This is a partial view of the second end of a blade according to an illustrative embodiment of the present invention.

[0015] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0016] 1. Main body; 11. Hard component; 111. Through hole; 1111. First through hole; 1112. Second through hole; 2. Soft component; 21. First side; 22. Second side; 23. Third side; 24. Fourth side; 25. Protrusion; 3. Rounded corner; 4. Edge; 41. Soft layer; 42. Intermediate layer. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0019] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0020] When using expressions such as "at least one of A, B, and C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C. Similarly, when using expressions such as "at least one of A, B, or C," the meaning should generally be interpreted according to the understanding of someone skilled in the art. For example, "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C.

[0021] The angle adjustment structure and accessories of the image capture device of this utility model will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0022] Example 1

[0023] Reference Figure 1 and Figure 2 As shown, this utility model provides a propeller blade for use in a multi-rotor unmanned aerial vehicle (UAV). The propeller blade includes a main body 1 and a flexible component 2. The flexible component 2 is disposed around the edge of the main body 1. The flexible component 2 includes a first side 21 that forms the leading edge of the propeller blade with the main body 1, a second side 22 that forms the tip of the propeller blade with the main body 1, and a third side 23 that spans the main body 1. The first side 21, the second side 22, and the third side 23 are three sides that form an enclosing shape.

[0024] In detail, refer to Figure 1 As shown, the first end of the main body 1 ( Figure 1 The left end of the middle blade is mounted to the blade hub via a mounting part. The flexible component 2 surrounds the second end of the main body 1. Figure 1 The edge of the right end of the middle blade. The end of the main body 1 furthest from the hub has a higher probability of causing injury to the human body. The soft part 2 is provided at the second end of the main body 1, which can effectively reduce the impact force of the blade on the human body, thereby reducing the injury caused by the blade.

[0025] It should be noted that, referring to Figure 2 As shown, the leading edge of the blade refers to Figure 2 The upper side of the main body 1. The trailing edge of the blade refers to... Figure 2 The lower side of the main body 1. Airflow flows from the leading edge to the trailing edge. The blade tip refers to... Figure 2 The right side of the main body 1.

[0026] Furthermore, referring to Figure 1and Figure 2 As shown, the first side 21 forms the leading edge of the blade with the main body 1, and the second side 22 forms the tip of the blade with the main body 1. In this way, when the blade hits the human body, the leading edge and tip of the blade have a greater impact force on the human body. At this time, the soft part 2 can form a buffer effect, effectively reducing the impact force of the blade on the human body, thereby reducing the damage caused by the blade to the human body.

[0027] The third side 23 of the soft component 2 spans across the main body 1. The first side 21, the second side 22, and the third side 23 are three sides that form an enclosing shape, which increases the area of ​​the joint surface between the soft component 2 and the main body 1, making the soft component 2 and the main body 1 tightly joined, improving the joint strength between the soft component 2 and the main body 1, and reducing the risk of the soft component 2 slipping off.

[0028] In some illustrative embodiments, reference is made to Figure 2 As shown, the first side 21, the second side 22, and the third side 23 are connected end to end to form a roughly triangular enclosing structure.

[0029] In this embodiment, the soft component 2 forms a roughly triangular surrounding structure around the second end of the main body 1. The mating surface between the soft component 2 and the wide surface of the main body 1 is roughly triangular. While maintaining the lightweight nature of the soft component 2, the area of ​​the mating surface between the soft component 2 and the main body 1 is increased, thereby improving the bonding strength between the soft component 2 and the main body 1 and reducing the risk of the soft component 2 slipping off.

[0030] In addition, the soft component 2 forms a roughly triangular enclosing structure with a unique visual identity, creating a differentiated appearance and enhancing the brand recognition of the propeller blades.

[0031] In some illustrative embodiments, reference is made to Figure 1 and Figure 3 As shown, the blade also includes a fourth side 24 that forms the trailing edge of the blade with the main body 1. The fourth side 24 and the first side 21 extend in the length direction of the blade, and the length of the fourth side 24 is less than the length of the first side 21.

[0032] In detail, the trailing edge of the blade also poses a possibility of causing injury to the human body. When the trailing edge of the blade hits the human body, the soft component 2 located at the trailing edge of the blade can act as a buffer, effectively reducing the impact force of the blade on the human body, thereby reducing the harm caused by the blade.

[0033] It should be noted that, because the leading edge of the blade is located upstream in the direction of blade rotation, the probability of the trailing edge of the blade causing injury to the human body is lower than that of the leading edge. The length of the fourth side 24 is shorter than the length of the first side 21, which further reduces the risk of injury to the human body while maintaining lightweight design.

[0034] In some illustrative embodiments, reference is made to Figure 3 As shown, the first side 21, the second side 22, the third side 23 and the fourth side 24 are connected end to end to form a roughly trapezoidal enclosing structure.

[0035] In this embodiment, the generally trapezoidal surrounding structure formed by the soft component 2 is disposed around the second end of the main body 1. The mating surface between the soft component 2 and the wide surface of the main body 1 is generally trapezoidal, which further increases the area of ​​the mating surface between the soft component 2 and the main body 1, improves the bonding strength between the soft component 2 and the main body 1, and reduces the risk of the soft component 2 slipping off.

[0036] In some illustrative embodiments, reference is made to Figure 3 As shown, the transition between the second side 22 and the first side 21 and the fourth side 24 is smooth, forming a rounded corner 3.

[0037] In this way, by setting the rounded corner 3, the transition of the rounded corner 3 is smooth, avoiding the formation of sharp edges. The rounded corner 3 greatly reduces the risk of injury to the human body compared to sharp edges, and improves the safety of the propeller blade.

[0038] It is understandable that the connection point between the second side 22 and the first side 21 and the fourth side 24 can also be an angle.

[0039] In some illustrative embodiments, the main body 1 is made of one of the following materials: metal, carbon fiber, wood, plastic, and glass fiber. It has good strength and good mechanical properties to meet the required hardness and strength so that it can rotate under the drive of the drive component, generate lift, and drive the multi-rotor UAV to fly normally.

[0040] In some illustrative embodiments, the flexible component 2 is made of one of the following materials: foam, cotton, rubber, and silicone.

[0041] In this embodiment, the hardness of the main body 1 is greater than that of the soft component 2. The soft component 2 has a certain degree of elasticity and can undergo slight deformation, which can form a buffer effect, effectively reducing the impact force of the blade on the human body, thereby reducing the harm caused by the blade to the human body.

[0042] In some illustrative embodiments, the ratio of the first side 21 to the leading edge ranges from 5% to 8%. For example, the ratio of the first side 21 to the leading edge can be 5%, 6%, 7%, 8%, etc., determined according to actual needs. In this way, while ensuring the required strength of the blade, the first side 21 forms a buffer at the leading edge of the blade, effectively reducing the impact force of the blade on the human body, thereby reducing the harm caused by the blade.

[0043] In some illustrative embodiments, the ratio of the fourth side 24 to the trailing edge ranges from 2% to 5%. For example, the ratio of the fourth side 24 to the trailing edge can be 2%, 3%, 4%, 5%, etc., determined according to actual needs. In this way, while ensuring the required strength of the blade, the fourth side 24 forms a buffer at the trailing edge of the blade, effectively reducing the impact force of the blade on the human body, thereby reducing the harm caused by the blade.

[0044] Reference Figure 2 and Figure 3 As shown, in some illustrative embodiments, the angle formed by the extensions of the second side 22 and the third side 23 ranges from 15° to 25°. For example, the angle formed by the extensions of the second side 22 and the third side 23 can be 15°, 17°, 19°, 21°, 23°, 25°, etc.

[0045] It should be noted that, with the length of the first side 21 remaining constant, the smaller the angle formed by the extensions of the second side 22 and the third side 23, and the smaller the length of the fourth side 24, the higher the lightweighting of the flexible component 2. However, the smaller the contact area between the flexible component 2 and the main body 1, the lower the stability of the connection between the flexible component 2 and the main body 1.

[0046] In this embodiment, the two ends of the third side 23 are connected to the first side 21 and the fourth side 24, respectively. The included angle formed by the extensions of the second side 22 and the third side 23 further defines the length relationship between the first side 21 and the fourth side 24, thereby achieving a balance between the lightweight of the soft component 2 and the stability of the soft component 2 in conjunction with the main body 1.

[0047] Reference Figure 3 and Figure 4 As shown, in some illustrative embodiments, the main body 1 is provided with a rigid member 11 bonded to the flexible member 2, and the flexible member 2 and the rigid member 11 form an edge portion 4. At least a portion of the edge portion 4 includes a flexible layer 41 formed by the flexible member 2 away from the main body 1 and an intermediate layer 42 close to the main body 1. The flexible layer 41 is connected to the main body 1 through the intermediate layer 42. The intermediate layer 42, in its cross-section along the blade width direction or along the blade length direction, includes a structure in which the flexible member 2 and the rigid member 11 are stacked.

[0048] In detail, the rigid member 11 is formed by extending the main body 1 outward in the length direction, that is, in Figure 4In this embodiment, the rigid member 11 extends to the right from the main body 1. In this embodiment, the rigid member 11 extends from the middle of the cross-section of the main body 1. Of course, it may not extend from the middle of the cross-section of the main body 1. For example, in other embodiments, it may extend from the upper part of the cross-section of the main body 1, or from the lower part of the cross-section of the main body 1, or from both the upper and lower parts of the cross-section of the main body 1 to form an intermittent rigid member 11, depending on the structure of the intermediate layer 42.

[0049] Optionally, the rigid component 11 is integrally formed with the main body 1, that is, the rigid component 11 and the main body 1 can be understood as a single component. This design can increase the overall strength of the rigid component 11 and the main body 1, while reducing the manufacturing difficulty.

[0050] Furthermore, the rigid component 11 and the main body 1 are integrally formed from the same material, which facilitates manufacturing. Of course, the rigid component 11 and the main body 1 can also be integrally formed from different materials. For example, the main body 1 and the rigid component 11 can be formed by machining an object containing two materials. It should also be noted that the rigid component 11 and the main body 1 can also be formed by connecting separate parts.

[0051] Specifically, the edge portion 4 includes a soft layer 41 located away from the main body portion 1, i.e., a soft layer 41 surrounding the rigid component 11. The soft layer 41 is formed from the soft component 2, meaning it is integrally molded from the same material. In other words, the soft component 2 and the soft layer 41 can be understood as a single component. This design increases the overall strength of the soft component 2 and the soft layer 41 while reducing manufacturing difficulty. Of course, it is also possible for the soft component 2 and the soft layer 41 to be formed by connecting separate components.

[0052] Reference Figure 4 As shown, in some illustrative embodiments, the cross-section of the intermediate layer 42 along the blade width direction includes a rigid member 11 located in the middle and soft members 2 located on both sides of the rigid member 11.

[0053] Specifically, in the thickness direction of the blade ( Figure 4 In the vertical direction of the blade, the cross-section of the intermediate layer 42 along the blade width direction includes the rigid component 11 located in the middle and the rigid component 11 located on both sides (in the vertical direction). Figure 4 The soft component 2 (on both sides of the hard component 11) wraps around the hard component 11. By setting the intermediate layer 42, which includes the soft component 2 and the hard component 11 in a stacked structure, the contact area between the soft component 2 and the hard component 11 can be effectively increased, so that the soft layer 41 can be firmly connected to the main body 1 and is not easy to fall off.

[0054] In some illustrative embodiments, the ratio of the thickness of the flexible component 2 to the thickness of the blade ranges from 29% to 39%. For example, the ratio of the thickness of the flexible component 2 to the thickness of the blade can be 29%, 31%, 33%, 35%, 37%, 39%, etc.

[0055] It should be noted that the higher the ratio of the thickness of the soft component 2 to the thickness of the blade, the greater the cushioning effect of the blade, but the lower the blade's hardness and strength. Conversely, the lower the ratio, the lower the blade's cushioning effect, but the higher its hardness and strength. By limiting the ratio of the thickness of the soft component 2 to the thickness of the blade, the required cushioning effect, hardness, and strength of the blade are achieved.

[0056] Reference Figure 4 , Figure 5 and Figure 6 As shown, in some illustrative embodiments, in the thickness direction of the blade ( Figure 4 In the vertical direction, the rigid component 11 is provided with a through hole 111, and the flexible component 2 is provided with a protrusion 25 that engages with the through hole 111. In this way, at least a portion of the protrusion 25 is embedded in the through hole 111.

[0057] By setting the through hole 111 and the protrusion 25, the bonding strength between the soft part 2 and the hard part 11 is increased, making it less likely for the soft part 2 to detach. The pull-out force of the soft part 2 reaches 25N-30N, and the probability of the soft part 2 detaching at a speed of 8000rpm is less than 5%. In particular, when the blade rotates, the protrusion 25 of the soft part 2 embedded in the through hole 111 can overcome the centrifugal force of the soft part 2, avoiding the situation where the centrifugal force of the soft part 2 is too large, causing the soft part 2 to peel off from the hard part 11.

[0058] Reference Figure 5 and Figure 6 As shown, in some illustrative embodiments, multiple through holes 111 are provided, and the multiple through holes 111 are distributed at intervals on the hard part 11. The multiple through holes 111 have the same diameter to reduce the difficulty of processing.

[0059] Reference Figure 6 As shown, in some illustrative embodiments, multiple through holes 111 are provided, and the diameters of the multiple through holes 111 are different. Since the extensions of the third side 23 and the second side 22 form an angle, the length of the rigid member 11 near the first side 21 is greater than the length of the rigid member 11 near the fourth side 24. Therefore, the diameter of the through hole 111 can be limited according to the space provided in the rigid member 11.

[0060] In some illustrative embodiments, the plurality of through holes 111 include at least one first through hole 1111 and at least one second through hole 1112. The diameter of the first through hole 1111 ranges from 0.32 mm to 0.38 mm. For example, the diameter of the first through hole 1111 can be 0.32 mm, 0.34 mm, 0.36 mm, 0.38 mm, etc. The diameter of the second through hole 1112 ranges from 0.22 mm to 0.28 mm. For example, the diameter of the second through hole 1112 can be 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, etc.

[0061] Understandably, the method of increasing the bonding strength between the soft component 2 and the hard component 11 is not limited to providing through holes 111 on the hard component 11. In some illustrative embodiments, grooves can also be provided on the hard component 11 in the thickness direction of the blade. By providing grooves, the soft component 2 can be partially embedded in the grooves, increasing the bonding strength between the soft component 2 and the hard component 11, making the soft component 2 less likely to fall off. In particular, when the blade rotates, the protrusion 25 of the soft component 2 embedded in the through hole 111 can overcome the centrifugal force of the soft component 2, avoiding the situation where the centrifugal force of the soft component 2 is too large, causing the soft component 2 to peel off from the hard component 11.

[0062] In an alternative illustrative embodiment, a boss can also be provided on the rigid member 11 in the thickness direction of the blade. The boss is spaced apart from the main body 1. When the soft member 2 is formed on the rigid member 11, the portion of the soft member 2 embedded between the rigid member 11 and the main body 1 can form an inverted structure with the rigid member 11, so that the soft member 2 and the rigid member 11 are firmly bonded together. In particular, when the blade rotates, the soft member 2 embedded between the rigid member 11 and the main body 1 can overcome the centrifugal force of the soft member 2 due to the obstruction of the rigid member 11, avoiding the situation where the soft member 2 peels off from the rigid member 11 when the centrifugal force is too large.

[0063] In an alternative illustrative embodiment, a roughening layer may also be provided on the hard component 11 in the thickness direction of the blade. The roughening layer can increase the contact area between the hard component 11 and the soft component 2, thereby increasing the bonding strength between the hard component 11 and the soft component 2.

[0064] In some illustrative embodiments, the flexible part 2 and the main body 1 are formed by two-color injection molding, that is, the flexible part 2 and the main body 1 are injection molded on the same two-color injection molding machine. Specifically, the two-color injection molding machine includes an identical rear mold and two different front molds. During injection molding, the main body 1 and the rigid part 11 of the blade are first injection molded using the rear mold and one set of front molds. After the main body 1 and the rigid part 11 are formed, the mold is opened, and then the rear mold is rotated 180° and the other set of front molds is closed to injection mold the flexible part 2 of the blade. This cycle is repeated to continuously perform the injection molding of the blade. The flexible layer 41 and the main body 1 are formed by two-color injection molding, which has high production efficiency. Moreover, it can effectively avoid surface quality problems such as burrs, scratches, and breaks in the molded blade, resulting in a high product yield and a good product appearance.

[0065] In some illustrative embodiments, the flexible part 2 is formed onto the main body 1 through a two-stage injection molding process. That is, the flexible part 2 and the main body 1 are injection molded on different injection molding machines. Specifically, the main body 1 and the rigid part 11 are first injection molded on the mold of one set of injection molding machines. After the main body 1 and the rigid part 11 are formed, the product is removed and placed into the mold of another set of injection molding machines to form the flexible part 2. Two-stage injection molding places lower demands on mold design and has the advantage of low cost in small-batch production.

[0066] In some illustrative embodiments, the flexible component 2 is fixed to the main body 1 by adhesive. Specifically, an adhesive is applied to the surface of the rigid component 11 and / or the flexible component 2, and the flexible component 2 is adhered to the rigid component 11. It should be noted that in this embodiment, the rigid component 11 has two configurations. One configuration is that the rigid component 11 extends from the middle of the cross-section of the main body 1, the thickness of the rigid component 11 is less than the thickness of the main body 1, and the outer surface of the rigid component 11 is not flush with the outer surface of the main body 1, so that the outer surface of the flexible component 2 is approximately flush with the outer surface of the main body 1 when the flexible component 2 is adhered.

[0067] Example 2

[0068] This invention also proposes a propeller for use in a multi-rotor drone. The propeller includes a hub and at least two blades mounted on the hub, wherein the blades are those described in any of the above embodiments. Because the propeller uses the aforementioned blades, the soft component 2 can provide cushioning when the blades hit a human body, effectively reducing injury. Furthermore, it increases the contact area between the soft component 2 and the hard component 11, effectively increasing the bonding strength between them, making the soft layer 41 less likely to detach from the main body 1.

[0069] Example 3

[0070] This utility model also proposes a multi-rotor drone, which includes a fuselage, arms, a drive unit, and a propeller. The root of the arms is mechanically coupled to the fuselage, and the propeller is connected to the end of the arms. The propeller includes a hub and at least two blades mounted on the hub. The propeller is mounted to the drive unit via the hub, and the blades are those described in any of the above embodiments. Because the multi-rotor drone uses the aforementioned blades, the soft layer 41 can provide a cushioning effect when the blades hit a person, effectively reducing injury. Furthermore, it increases the contact area between the soft component 2 and the hard component 11, effectively increasing the bonding strength between them, making the soft layer 41 less likely to detach from the main body 1.

[0071] It should be noted that the blades proposed in this utility model are not limited to use on multi-rotor drones, but can also be used on fixed-wing drones. When the blades are used on fixed-wing drones, the root of the blades is directly connected to the fuselage of the fixed-wing drone and used as wings.

[0072] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference in the accompanying drawings and are not intended to limit the scope of protection of this utility model. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this utility model.

[0073] The embodiments of the present invention have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the present invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the present invention, and all such substitutions and modifications should fall within the scope of the present invention.

Claims

1. A blade for use in a multi-rotor unmanned aerial vehicle, characterized in that, include: Main body; A flexible component is disposed at the edge of the main body portion. The flexible component includes a first side that forms the leading edge of a blade with the main body portion, a second side that forms the tip of the blade with the main body portion, and a third side that spans the main body portion. The first side, the second side, and the third side are three sides that form an enclosing shape. The first side, the second side, and the third side are connected end to end to form a roughly triangular enclosing structure. Alternatively, the flexible component may further include a fourth side that forms the trailing edge of the blade with the main body, the fourth side and the first side extending in the length direction of the blade, the length of the fourth side being less than the length of the first side.

2. The blade according to claim 1, characterized in that, The first side, the second side, the third side, and the fourth side are connected end to end to form a roughly trapezoidal enclosure structure.

3. The blade according to claim 1, characterized in that, The ratio of the first side to the leading edge ranges from 5% to 8%; and / or, The ratio of the fourth side to the trailing edge ranges from 2% to 5%; and / or, The angle formed by the extensions of the second side and the third side ranges from 15° to 25°; and / or, The ratio of the thickness of the flexible component to the thickness of the blade ranges from 29% to 39%.

4. The blade according to claim 1, characterized in that, The main body is provided with a rigid component that is combined with the soft component, and the soft component and the rigid component form an edge portion; At least a portion of the edge portion includes a soft layer formed by the soft material away from the main body portion and an intermediate layer near the main body portion; the soft layer is connected to the main body portion through the intermediate layer; The intermediate layer, in its cross-section along the blade width direction or along the blade length direction, comprises a structure in which the soft component and the hard component are stacked.

5. The blade according to claim 4, characterized in that, The cross-section of the intermediate layer along the blade width direction includes a rigid component in the middle and soft components on both sides of the rigid component.

6. The blade according to claim 5, characterized in that, In the thickness direction of the blade, the rigid component is provided with a through hole, and the flexible component is provided with a protrusion that engages with the through hole.

7. The blade according to claim 6, characterized in that, Multiple through holes are provided, and the diameter of the multiple through holes is the same; and / or The multiple through holes are provided, and the diameters of the multiple through holes are different; or, the multiple through holes include at least one first through hole and at least one second through hole, the diameter of the first through hole is in the range of 0.32mm to 0.38mm, and the diameter of the second through hole is in the range of 0.22mm to 0.28mm.

8. A propeller for use in a multi-rotor unmanned aerial vehicle, characterized in that, The propeller includes a hub and at least two blades mounted on the hub, the blades being the blades according to any one of claims 1 to 7.

9. A multi-rotor unmanned aerial vehicle, characterized in that, It includes a fuselage, an arm, and a propeller as described in claim 8, wherein the root of the arm is mechanically coupled to the fuselage, and the propeller is connected to the end of the arm.

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