WO2018058769A1

WO2018058769A1 - Blade, airscrew, power package and unmanned aerial vehicle

Info

Publication number: WO2018058769A1
Application number: PCT/CN2016/106550
Authority: WO
Inventors: 刘峰; 邓涛; 江彬
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2016-09-27
Filing date: 2016-11-21
Publication date: 2018-04-05
Also published as: CN206202682U; CN109641654A

Abstract

Provided is a blade (100) used for an airscrew (300). At a position on the blade (100) where the distance from a centre of gyration of the airscrew (300) is 52.38% of the radius of gyration of the airscrew (300), the attack angle of the blade (100) is 13.59±2.5 degrees; at a position on the blade (100) where the distance from the centre of gyration of the airscrew (300) is 66.67% of the radius of gyration of the airscrew (300), the attack angle of the blade (100) is 11.09±2.5 degrees; and at a position on the blade (100) where the distance from the centre of gyration of the airscrew (300) is 80.95% of the radius of gyration of the airscrew (300), the attack angle of the blade (100) is 9.76±2.5 degrees. Also provided are the airscrew (300) using the blade (100), and a power package (200) and an unmanned aerial vehicle using the airscrew (300). Through the design of attack angles of different portions of the blade, the air resistance is reduced, the efficiency is improved, and the propelling force is relatively large.

Description

Blades, propellers, power packs and unmanned aerial vehicles

Technical field

The present invention relates to a paddle, a propeller having the paddle, a power kit having the propeller, and an aircraft having the power kit.

Background technique

The propeller on the unmanned aerial vehicle is a key component of the unmanned aerial vehicle, and the propeller is used to convert the rotation of the motor or the engine intermediate shaft of the UAV into a propulsive force to provide flight power to the unmanned aerial vehicle. The prior art propellers have low working efficiency due to the contour and structure constraints, and cannot meet the expected driving force requirements at work.

Summary of the invention

In view of the above, it is necessary to provide a blade having higher efficiency, and it is also necessary to provide a propeller using the blade and a power pack and an unmanned aerial vehicle using the propeller.

a blade for a propeller, wherein a distance from a center of rotation of the propeller on the blade is 52.38% of a radius of gyration of the propeller, and an angle of attack of the blade is 13.59 ± 2.5 degrees; The distance from the center of rotation of the propeller on the blade is 66.67% of the radius of gyration of the propeller, the angle of attack of the blade is 11.09 ± 2.5 degrees; the pitch of the propeller is from the propeller The distance from the center of revolution is 80.95% of the radius of gyration of the propeller, and the angle of attack of the blade is 9.76 ± 2.5 degrees.

Further, the distance from the center of rotation of the propeller on the blade is 38.10% of the radius of gyration of the propeller, and the angle of attack of the blade is 16.68±2.5 degrees;

Or/and, the distance from the center of rotation of the propeller on the blade is 95.24% of the radius of gyration of the propeller, and the angle of attack of the blade is 8.60 ± 2.5 degrees.

Further, the rotary diameter of the propeller is 210 mm, and the angle of attack of the blade is 16.68±2.5 degrees at a distance of 40 mm from the center of rotation of the propeller;

Or / and, at a distance of 55 mm from the center of rotation of the propeller, the angle of attack of the blade is 13.59 ± 2.5 degrees;

Or / and, at a distance of 70 mm from the center of rotation of the propeller, the angle of attack of the blade is 11.09 ± 2.5 degrees;

Or / and, at a distance of 85 mm from the center of rotation of the propeller, the angle of attack of the blade is 9.76 ± 2.5 degrees;

Or/and, at an angle of 100 mm from the center of rotation of the propeller, the blade has an angle of attack of 8.60 ± 2.5 degrees.

Further, the distance from the center of rotation of the propeller on the blade is 52.38% of the radius of gyration of the propeller, and the chord length of the blade is 18.44±5 mm;

Or / and, the distance from the center of rotation of the propeller on the blade is 66.67% of the radius of gyration of the propeller, the chord length of the blade is 16.08 ± 5 mm;

Or/and, the distance from the center of rotation of the propeller on the blade is 80.95% of the radius of gyration of the propeller, and the chord length of the blade is 13.75 ± 5 mm.

Further, the distance from the center of rotation of the propeller on the blade is 38.10% of the radius of gyration of the propeller, and the chord length of the blade is 20.66±5 mm;

Or/and, the distance from the center of rotation of the propeller on the blade is 95.24% of the radius of gyration of the propeller, and the chord length of the blade is 11.26 ± 5 mm.

Further, the diameter of the rotation of the propeller is 210 ± 50 mm.

Further, the paddle includes a leaf surface and a leaf back disposed away from each other, and a first side edge connecting one side of the leaf back and the leaf surface, and another connecting the leaf back and the leaf surface The second side edge of one side.

Further, the cross-sectional profile of the leaf surface and the cross-sectional profile of the blade back are both curved structures.

Further, the first side edge comprises a curved outwardly convex first arching portion; the second side edge comprises a curved outwardly projecting second arching portion.

Further, the distance from the paddle of the blade to the paddle is 4.25 mm.

A propeller comprising a paddle and at least one blade as described above, the blade being provided with a mounting portion, the mounting portion being coupled to the paddle.

Further, the propeller further includes a paddle, and the blade is provided with a mounting portion, and the mounting portion is connected to the paddle.

Further, the mounting portion is provided with a connecting hole for engaging with a fastener, so that the mounting portion can be connected to the paddle by the fastener;

Or/and, the center of the paddle is a center of rotation of the propeller, and the mounting portion is provided with a connecting hole through which the mounting portion can be connected to the paddle, the connecting hole The center is spaced apart from the center of the paddle by a predetermined distance.

Further, the propeller is a folding paddle, the number of the blades is at least two, and each of the blades is rotatably coupled to the paddle;

Alternatively, the propeller includes a hub that is fixedly coupled to the blade, the number of the blades being at least two.

Further, the propeller has a geometric pitch of 3 ± 0.5 inches.

Further, the power pack includes at least one propeller as described above and a drive member that drives the propeller to rotate.

Further, the driving member is a motor, and the propeller is connected to the motor, and the motor has a KV value of 1400 rpm / (minute·volt).

An unmanned aerial vehicle comprising a fuselage, a plurality of arms, and a plurality of power sets as described above, the plurality of arms being coupled to the body, the plurality of power sets being respectively mounted on the plurality of On the arm.

The propeller provided by the invention reduces the air resistance, improves the efficiency, and has a relatively large driving force through the design of the angle of attack on different parts of the blade.

DRAWINGS

FIG. 1 is a schematic structural view of a power package according to an embodiment of the present invention.

2 is a schematic view showing the structure of a blade of the propeller of the power pack of FIG. 1.

Figure 3 is a front elevational view of the paddle of Figure 2.

Figure 4 is a side elevational view of the paddle of Figure 2.

Figure 5 is a side elevational view of another perspective of the paddle of Figure 2.

Figure 6 is a front elevational view of the paddle of Figure 3.

Figure 7 is a cross-sectional view of the A-A section of the blade of Figure 6.

Figure 8 is a cross-sectional view of the B-B section of the blade of Figure 6.

Figure 9 is a cross-sectional view of the C-C section of the blade of Figure 6.

Figure 10 is a cross-sectional view of the D-D section of the blade of Figure 6.

Figure 11 is a cross-sectional view of the E-E section of the blade of Figure 6.

Main component symbol description

Blade 100

Mounting section 101

Connection hole 103

Foliage 10

Leaf back 20

First side edge 30

First arched portion 31

Second side edge 40

Second arch 41

The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or the component can be present. When a component is considered to "connect" another component, it can be directly connected to another component or possibly a central component. When a component is considered to be "set to" another component, it can be placed directly on another component or possibly with a centered component.

Unless otherwise defined, all technical and scientific terms used herein and techniques pertaining to the invention Those skilled in the art generally understand the same meaning. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

In the process of implementing the present invention, the inventors have found the following problems:

(1) The efficiency of the propeller is related to the angle of attack and the chord length of the propeller. For this reason, the inventors made major improvements in the shape and structure of the propeller.

(2) In particular, the efficiency of the propeller is affected by the angle of attack and the chord length in the middle of the propeller (40% to 90%). For this reason, the inventors focused on improving the center of the propeller.

(3) The shape and structure of the propeller directly affect the direction of the driving force and the driving force generated when it is rotated. For this reason, the inventors have made some improvements in this respect.

Embodiments of the present invention provide a propeller that includes a paddle. The distance from the center of rotation of the propeller on the blade is 52.38% of the radius of gyration of the propeller, the angle of attack of the blade is 13.59 ± 2.5 degrees; the propeller is spaced from the propeller The distance of the center of rotation is 66.67% of the radius of gyration of the propeller, the angle of attack of the blade is 11.09 ± 2.5 degrees; the distance from the center of rotation of the propeller on the blade is the propeller At 80.95% of the radius of gyration, the angle of attack of the blade is 9.76 ± 2.5 degrees.

The embodiment of the present invention further provides a power package of an unmanned aerial vehicle, the power package includes a propeller and a motor, the propeller is connected to the motor, and the motor is used to drive the propeller to rotate, the KV of the motor The value is 1400 rpm / (minute volts). The propeller includes a blade on which the distance from the center of rotation of the propeller is 66.67% of the radius of gyration of the propeller, and the angle of attack of the blade is 11.09 ± 2.5 degrees; The distance from the center of rotation of the propeller on the blade is 80.95% of the radius of gyration of the propeller, and the angle of attack of the blade is 9.76 ± 2.5 degrees. The propeller can provide a large driving force.

An embodiment of the present invention further provides an unmanned aerial vehicle including a fuselage, a plurality of arms, and a plurality of power sets, wherein the plurality of arms are connected to the body, and the plurality of power sets are respectively installed in the On multiple arms. The power pack includes a propeller and a motor, the propeller being coupled to the motor for driving the propeller to rotate, the motor having a KV value of 1400 rpm / (minute volt). The propeller includes a blade on the blade that is in rotation from the propeller The distance of the core is 66.67% of the radius of gyration of the propeller, the angle of attack of the blade is 11.09±2.5 degrees; the distance from the center of rotation of the propeller on the blade is the radius of gyration of the propeller At 80.95%, the blade has an angle of attack of 9.76 ± 2.5 degrees.

Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The features of the embodiments and examples described below can be combined with each other without conflict.

An unmanned aerial vehicle according to an embodiment of the present invention includes a fuselage, an arm, a propeller, and a driving member for driving the rotation of the propeller, and the arm is coupled to the fuselage. It will be appreciated that in some embodiments, the propeller may be a folding paddle. The number of the propellers may be selected according to actual needs, and may be one, two or more. In this embodiment, the driving component is a motor, and the KV value of the motor is 1400 rpm/(minute·volt); it can be understood that in other embodiments, the KV value of the motor can be selected according to actual flight requirements. The drive member may be in other forms such as an engine or the like.

The propeller may be a positive paddle or a reverse paddle. The so-called positive paddle refers to a propeller that rotates counterclockwise to generate lift from the tail of the driving part such as the motor to the direction of the motor head; the so-called reverse paddle refers to the clockwise rotation from the tail of the motor to the direction of the motor head to generate lift. propeller. The structure of the positive paddle is mirror symmetrical with the structure of the reverse paddle, so the structure of the propeller is only exemplified by a positive paddle.

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a power package according to an embodiment of the present invention. Specifically, in the embodiment, the power package 200 is connected to the arm, and the arm is plural. The power package 200 includes a propeller 300 and a driving member 400, and the propeller 300 and the driving member 400 are included. There are a plurality of, and each of the driving members 400 drives one of the propellers 300 to rotate to constitute a power pack 200. At least one set of the power pack 200 is provided on each arm.

It will be appreciated that the power pack 200 can also include a drive member 400 and a plurality (e.g., two) of propellers 300.

In addition, the terms of the upper and lower orientations appearing in the description of the embodiments of the present invention are based on the conventional operating posture of the propeller 300 and the aircraft after the propeller 300 is mounted on the aircraft, and should not be considered. Restrictive.

Referring to FIG. 2 to FIG. 4 simultaneously, a schematic structural view of the blade 100 of the propeller 300 provided by the embodiment of the present invention is shown. The propeller 300 includes a paddle (not shown) and a setting Two blades 100 on either side of the paddle are disposed symmetrically about the center of the paddle. The two blades 100 and the paddle rotate to form a paddle. In the present embodiment, the center of the paddle substantially coincides with the center of the paddle. Of course, in other embodiments, the propeller 300 can be a straight paddle, and the propeller 300 can include a hub and two or more blades 100 that are fixedly coupled to the hub.

In the present embodiment, the propeller 300 is a fixed propeller, and the two blades 100 are fixedly coupled to the paddle. Specifically, in the illustrated embodiment, one end of the blade 100 is provided with a mounting portion 101, and the mounting portion 101 is provided with a connecting hole 103 through which the mounting portion 101 and the paddle are Connected to connect the paddle 100 to the paddle. In the present embodiment, the connecting hole 103 is a threaded hole, and a fastener such as a screw is disposed in the threaded hole, and the mounting portion 101 is connected to the paddle by the fastener. In one embodiment, the distance between the center of the connecting hole 103 and the center O of the paddle is approximately 4.25 mm. It can be understood that in other embodiments, the distance between the center of the connecting hole 103 and the center of the paddle can be set according to actual needs, and is not limited to the description of the embodiments of the present invention. Even in some embodiments, the mounting portion 101 and the connecting hole 103 may be omitted.

It will be appreciated that in other embodiments, the propeller 300 can be a foldable paddle, the paddle 100 being rotatably coupled to the paddle. Alternatively, in some embodiments, the paddle 100 is integrally formed with the paddle or, in some embodiments, the paddle 100 is removably mounted to the paddle by a connector. It is not limited to being described in the embodiment of the present invention. It will also be appreciated that the number of blades 100 in each of the propellers 300 may be other numbers, such as three, four, etc., depending on actual needs. Specifically, as in another embodiment, the number of the blades 100 is three, and the three blades 100 are evenly spaced in the circumferential direction with respect to the center of the paddle.

In the present embodiment, the paddle has a diameter of 210 ± 5 mm. Specifically, the diameter of the paddle may be 205 mm, 207.5 mm, 210 mm, 212.5 mm, 215 mm, or the diameter of the paddle may be any value within a range of values defined by any two of the above values. . Preferably, the paddle has a diameter of 210 mm. Since the paddle is formed by the rotation of the paddle 100 and the paddle, the "center of the paddle" and the "paddle center" mentioned above and below, should be understood as "propeller" "slewing center", similarly, "paddle" mentioned above and below The diameter of the disk and the diameter of the paddle are to be understood as the "swing diameter of the propeller", "the radius of the paddle" and "the radius of the paddle" should be understood as "the radius of gyration of the propeller".

The paddle can be used to connect with a rotating shaft of the driving member 400 of the unmanned aerial vehicle to enable the driving member 400 to drive the propeller 300 to rotate. A reinforcing spacer may be embedded in the paddle, and the reinforcing sheet may be made of a lightweight high-strength material such as aluminum alloy to increase the strength of the propeller 300.

Referring to FIG. 5 at the same time, in the embodiment, the paddle is substantially cylindrical. Two of the blades 100 are disposed in a central symmetry on both sides of the paddle, and the connection between each of the blades 100 and the paddle is threadedly connected. In the present embodiment, the geometric pitch of the propeller 300 is 3 ± 0.5 inches, and the geometric pitch is the distance that the blade advances one revolution when the blade angle of attack is zero. Specifically, the geometric pitch of the propeller 300 can be 2.5 inches, 2.6 inches, 2.7 inches, 2.8 inches, 2.9 inches, 3.0 inches, 3.1 inches, 3.2 inches, 3.3 inches, 3.4 inches, 3.5 inches, or the geometry The pitch can be any value within the range of values defined by any two of the above values. Preferably, the geometric pitch is 3 inches.

The blade 100 includes a blade face 10 and a blade back 20 disposed away from each other, and a first side edge 30 connecting the blade back 20 and a side of the blade face 10, connecting the blade back 20 and the The second side edge 40 of the other side of the foliage 10. The cross-sectional profile of the foliage 10 and the cross-sectional profile of the blade back 20 are both curved (see Figures 7-11). When the propeller 300 is mounted on the driving member 400 of the drone, the blade surface 10 faces the driving member 400, that is, the blade surface 10 is disposed downward; and the blade back 20 Deviating from the drive member 400, that is, the leaf back 20 is disposed upward. In the present embodiment, the leaf surface 10 and the leaf back 20 are curved surfaces. The first side edge 30 includes a curved, outwardly projecting first arched portion 31. The first arching portion 31 is smoothly transitionally connected to other portions of the first side edge 30. In the present embodiment, the first arching portion 31 is disposed adjacent to the paddle. The second side edge 40 includes a curved, outwardly projecting second bulge 41 that is smoothly transitionally connected to other portions of the second side edge 40. In the present embodiment, the second arching portion 41 is disposed adjacent to the paddle.

In the propeller 300 provided by the embodiment of the present invention, the blade 100 has no sharp twist, the stress is small, the structural strength is high, the fracture is not easy, and the reliability is high. One end of the blade 100 remote from the paddle is the thinnest portion of the paddle 100, which is advantageous for reducing air resistance. That is, The thickness of one end of the blade 100 away from the center of the paddle is less than the thickness of other portions of the paddle 100.

In the present embodiment, the length of the blade 100 is 96 ± 5 mm. The length of the blade 100 may be any value between 91 mm and 101 mm, such as 91 mm, 93.5 mm, 96 mm, 98.5 mm, 101 mm, or the length of the paddle 100 may be any two of the above. Any value within the range of values defined by the values. Preferably, the blade 100 has a length of 96 mm.

The angle of attack referred to herein refers to the angle between the chord of the blade 100 and the velocity of the incoming flow.

Referring to FIG. 6 and FIG. 7 simultaneously, the distance from the center O of the paddle on the paddle 100 is 38.10% of the paddle radius, and the angle of attack α1 of the paddle 100 is 16.68±2.5. degree. Specifically, the angle of attack α1 of the blade 100 herein may be 14.18 degrees, 15.18 degrees, 15.68 degrees, 16.68 degrees, 17.68 degrees, 18.18 degrees, 19.18 degrees, or the angle of attack α1 of the blade 100 herein. Any value within the numerical range defined by any two of the above numerical values may be used. In the present embodiment, the angle of attack α1 is 16.68 degrees. The distance from the center O of the paddle on the paddle 100 is 38.10% of the paddle radius, and the chord length L1 of the paddle 100 is 20.66 ± 5 mm. Specifically, the chord length L1 of the blade 100 herein may be 15.66 mm, 16.66 mm, 18.66 mm, 20.66 mm, 22.66 mm, 24.66 mm, 25.66 mm, or the chord length L1 of the blade 100 herein. The numerical value within the range of values defined by any two of the above values may be, in the present embodiment, the chord length L1 is 20.66 mm.

Referring to FIG. 6 and FIG. 8 simultaneously, the distance from the center O of the paddle on the paddle 100 is 52.38% of the paddle radius, and the angle of attack α2 of the paddle 100 is 13.59±2.5. degree. Specifically, the angle of attack α2 of the blade 100 herein may be 11.09 degrees, 12.09 degrees, 12.59 degrees, 13.59 degrees, 14.59 degrees, 15.09 degrees, 16.09 degrees, or the angle of attack α2 of the blade 100 herein. Any value within the numerical range defined by any two of the above numerical values may be used. In the present embodiment, the angle of attack α2 is 13.59 degrees. The distance from the center O of the paddle on the paddle 100 is 52.38% of the paddle radius, and the chord length L2 of the paddle 100 is 18.44 ± 5 mm. Specifically, the chord length L2 of the blade 100 herein may be 13.44 mm, 14.44 mm, 16.44 mm, 18.44 mm, 20.44 mm, 22.44 mm, 23.44 mm, or, in particular, the paddle 100 herein. The chord length L2 can be any value within a range of values defined by any two of the above values. In the present embodiment, the chord length L2 is 18.44 mm.

Referring to FIG. 6 and FIG. 9 simultaneously, the distance from the center O of the paddle on the paddle 100 is 66.67% of the paddle radius, and the angle of attack α3 of the paddle 100 is 11.09±2.5. degree. Specifically, the angle of attack α3 of the blade 100 herein may be 8.59 degrees, 9.59 degrees, 10.09 degrees, 11.09 degrees, 12.09 degrees, 12.59 degrees, 13.59 degrees, or the angle of attack α3 of the blade 100 herein. Any value within the numerical range defined by any two of the above numerical values may be used. In the present embodiment, the angle of attack α3 is 11.09 degrees. The distance from the center O of the paddle on the paddle 100 is 66.67% of the paddle radius, and the chord length L3 of the paddle 100 is 16.08 ± 5 mm. Specifically, the chord length L3 of the blade 100 herein may be 11.08 mm, 12.08 mm, 14.08 mm, 16.08 mm, 18.08 mm, 20.08 mm, 21.08 mm, or the chord length L3 of the blade 100 herein. Any value within the numerical range defined by any two of the above numerical values may be used. In the present embodiment, the chord length L3 is 16.08 mm.

Referring to FIG. 6 and FIG. 10 simultaneously, the distance from the center O of the paddle on the paddle 100 is 80.95% of the paddle radius, and the angle of attack α4 of the paddle 100 is 9.76±2.5. degree. Specifically, the angle of attack α4 of the blade 100 herein may be 7.26 degrees, 8.26 degrees, 8.76 degrees, 9.76 degrees, 10.76 degrees, 11.26 degrees, 12.26 degrees, or the angle of attack α4 of the blade 100 herein. Any value within the numerical range defined by any two of the above numerical values may be used. In the present embodiment, the angle of attack α4 is 9.76 degrees. The distance from the center O of the paddle on the paddle 100 is 80.95% of the paddle radius, and the chord length L4 of the paddle 100 is 13.75 ± 5 mm. Specifically, the chord length L4 of the blade 100 herein may be 8.75 mm, 9.75 mm, 11.75 mm, 13.75 mm, 15.75 mm, 17.75 mm, 18.75 mm, or the chord length L4 of the blade 100 herein. Any value within the numerical range defined by any two of the above numerical values may be used. In the present embodiment, the chord length L4 is 13.75 mm.

Referring to FIG. 6 and FIG. 11 simultaneously, the distance from the center O of the paddle on the paddle 100 is 95.24% of the paddle radius, and the angle of attack α5 of the paddle 100 is 8.60±2.5. degree. Specifically, the angle of attack α5 of the blade 100 herein may be 6.10 degrees, 7.10 degrees, 7.60 degrees, 8.60 degrees, 9.60 degrees, 10.10 degrees, 11.10 degrees, or the angle of attack α5 of the blade 100 herein. Any value within the numerical range defined by any two of the above numerical values may be used. In the present embodiment, the angle of attack α5 is 8.60 degrees. The distance from the center O of the paddle on the paddle 100 is the paddle At 95.24% of the disk radius, the chord length L5 of the blade 100 is 11.26 ± 5 mm. Specifically, the chord length L5 of the blade 100 herein may be 6.26 mm, 7.26 mm, 9.26 mm, 11.26 mm, 13.26 mm, 15.26 mm, 16.26 mm, or the chord length L5 of the blade 100 herein. Any value within the range of values defined by any two of the above values may be used. In the present embodiment, the chord length L5 is 11.26 mm.

Referring again to FIGS. 6-11, in the present embodiment, the paddle has a diameter of 210 mm. At an angle of 40 mm from the center of the paddle on the blade 100, the angle of attack α1 of the blade 100 is 16.68 degrees, and the chord length L1 of the blade 100 is 20.66 mm; at a distance from the paddle At an angle of 55 mm at the center, the angle of attack α2 of the blade 100 is 13.59 degrees, the chord length L2 of the blade 100 is 18.44 mm, and the blade 100 is attacked 70 mm from the center of the paddle. The angle α3 is 11.09 degrees, the chord length L3 of the blade 100 is 16.08 mm, and the angle of attack α4 of the blade 100 is 9.76 degrees at a distance of 85 mm from the center of the paddle, the paddle 100 The chord length L4 is 13.75 mm; at an angle of 100 mm from the center of the paddle, the angle of attack α5 of the blade 100 is 8.60 degrees, and the chord length L5 of the blade 100 is 11.26 mm.

Please refer to Table 1. Table 1 shows the driving force values of the propellers provided by the present embodiment at different rotational speeds.

Table 1 Propeller pull force - power value

As can be seen from the table, the propeller provided by the embodiment of the present invention requires less power under the same pulling force, thereby saving power consumption, increasing the cruising distance of the UAV, and improving efficiency.

The propeller provided by the invention reduces the air resistance, improves the efficiency, increases the cruising range of the aircraft and improves the flight performance of the aircraft through the design of the angle of attack on different parts of the blade. In addition, those skilled in the art should understand that the above embodiments are only used to illustrate the invention, and are not intended to limit the invention as long as it is within the spirit of the invention. Appropriate changes and modifications of the above embodiments are intended to fall within the scope of the invention.

Claims

A blade for use in a propeller, characterized in that: the distance from the center of rotation of the propeller on the blade is 52.38% of the radius of gyration of the propeller, and the angle of attack of the blade is 13.59 ±2.5 degrees; the distance from the center of rotation of the propeller on the blade is 66.67% of the radius of gyration of the propeller, the angle of attack of the blade is 11.09 ± 2.5 degrees; on the blade The distance from the center of rotation of the propeller is 80.95% of the radius of gyration of the propeller, and the angle of attack of the blade is 9.76 ± 2.5 degrees.
The paddle according to claim 1, wherein a distance from said center of rotation of said propeller on said blade is 38.10% of a radius of gyration of said propeller, and said blade has an angle of attack of 16.68 ±2.5 degrees;

Or/and, the distance from the center of rotation of the propeller on the blade is 95.24% of the radius of gyration of the propeller, and the angle of attack of the blade is 8.60 ± 2.5 degrees.
The paddle according to claim 1, wherein said propeller using said blade has a turning diameter of 210 mm, and said blade has an angle of attack of 16.68 at a distance of 40 mm from a center of rotation of said propeller. ±2.5 degrees;

Or / and, at a distance of 55 mm from the center of rotation of the propeller, the angle of attack of the blade is 13.59 ± 2.5 degrees;

Or / and, at a distance of 70 mm from the center of rotation of the propeller, the angle of attack of the blade is 11.09 ± 2.5 degrees;

Or / and, at a distance of 85 mm from the center of rotation of the propeller, the angle of attack of the blade is 9.76 ± 2.5 degrees;

Or/and, at an angle of 100 mm from the center of rotation of the propeller, the blade has an angle of attack of 8.60 ± 2.5 degrees.
A paddle according to claim 1, wherein a distance from said center of revolution of said propeller on said blade is 52.38% of a radius of gyration of said propeller, said chord of said blade being 18.44 ±5 mm;

Or / and, the distance from the center of rotation of the propeller on the blade is 66.67% of the radius of gyration of the propeller, the chord length of the blade is 16.08 ± 5 mm;

Or/and, the distance from the center of rotation of the propeller on the blade is 80.95% of the radius of gyration of the propeller, and the chord length of the blade is 13.75 ± 5 mm.
A paddle according to claim 4, wherein a distance from said center of revolution of said propeller on said blade is 38.10% of a radius of gyration of said propeller, said chord of said blade being 20.66 ±5 mm;

Or/and, the distance from the center of rotation of the propeller on the blade is 95.24% of the radius of gyration of the propeller, and the chord length of the blade is 11.26 ± 5 mm.
The paddle according to claim 1, wherein said propeller has a diameter of 210 ± 50 mm.
The paddle according to claim 1, wherein said blade includes a leaf surface and a leaf back disposed away from each other, and a first side edge connecting the leaf back and a side of said leaf surface, and connecting The leaf back and the second side edge of the other side of the leaf surface.
The paddle according to claim 7, wherein the cross-sectional profile of the foliar surface and the cross-sectional profile of the blade back are both curved structures.
The paddle according to claim 7, wherein said first side edge comprises a curved outwardly convex first arch; said second side edge comprises a curved outwardly projecting Second arch.
The paddle of claim 1 wherein the paddle aperture of the paddle is at a distance of 4.25 mm from the paddle.
A propeller, characterized in that the propeller comprises a paddle and at least one blade according to any one of claims 1 to 10, the blade being provided with a mounting portion, the mounting portion and the paddle Seat connection.
A propeller according to claim 10, wherein said mounting portion is provided with a coupling hole for engaging with a fastener to enable said mounting portion to be coupled by said fastener At the paddle;

Or/and, the center of the paddle is a center of rotation of the propeller, and the mounting portion is provided with a connecting hole through which the mounting portion can be connected to the paddle, the connecting hole The center is spaced apart from the center of the paddle by a predetermined distance.
A propeller according to claim 10, wherein said propeller is a folding paddle, The number of the blades is at least two, and each of the blades is rotatably coupled to the paddle;

Alternatively, the propeller includes a hub that is fixedly coupled to the blade, the number of the blades being at least two.
The propeller of claim 11 wherein said propeller has a geometric pitch of 3 ± 0.5 inches.
A power kit for an unmanned aerial vehicle, characterized in that the power kit comprises at least one propeller according to any one of claims 11 and a driving member that drives the propeller to rotate.
A power pack according to claim 15, wherein said driving member is a motor, and said propeller is coupled to said motor, said motor having a KV value of 1400 rpm / (minute volt).
An unmanned aerial vehicle comprising a fuselage, a plurality of arms, and a plurality of power sets according to claim 15 or 16, wherein the plurality of arms are coupled to the body, and the plurality of power sets are separately mounted On the plurality of arms.