WO2017124781A1

WO2017124781A1 - Propeller, power assembly and unmanned aircraft

Info

Publication number: WO2017124781A1
Application number: PCT/CN2016/101740
Authority: WO
Inventors: 刘峰; 江彬; 邓涛; 王庶
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2016-01-19
Filing date: 2016-10-11
Publication date: 2017-07-27
Also published as: CN205345321U

Abstract

Provided is a propeller comprising blades (200), wherein the blades (200) rotate to form a propeller disk. At a position away from the centre of the propeller disk with 50.14% of the radius of the propeller disk, the angle of attack of the blade (200) is 14.4±3 degrees; at a position away from the centre of the propeller disk with 70.08% of the radius of the propeller disk, the angle of attack of the blade (200) is 10.5±3 degrees; and at a position away from the centre of the propeller disk with 90.03% of the radius of the propeller disk, the angle of attack of the blade (200) is 8±3 degrees. In addition, further provided are an unmanned aircraft comprising the above-mentioned propeller and a power assembly thereof.

Description

Propeller, power pack and unmanned aerial vehicle

Technical field

The present invention relates to a propeller, 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 of the unmanned aerial vehicle or the shaft of the engine into thrust or lift. The outer shape of the propeller in the prior art is mostly rectangular, and the resistance is large and the efficiency is low, which results in the small flying speed of the unmanned aerial vehicle and the short following distance, which seriously affects the flight performance of the unmanned aerial vehicle.

Summary of the invention

In view of the above, it is necessary to provide a propeller capable of reducing drag, improving efficiency, increasing the range of the UAV, and improving the flight performance of the UAV. It is also necessary to provide a power kit with the propeller and no Human aircraft.

A propeller includes a paddle that rotates to form a paddle. At an angle of 50.14% of the radius of the paddle from the center of the paddle, the blade has an angle of attack of 14.4 ± 3 degrees; at a distance from the center of the paddle is 70.08 of the radius of the paddle At %, the angle of attack of the blade is 10.5 ± 3 degrees; at a distance of 90.03% of the radius of the paddle from the center of the paddle, the blade has an angle of attack of 8 ± 3 degrees.

Further, at an angle of 20.11% of the radius of the paddle from the center of the paddle, the blade has an angle of attack of 23.2±3 degrees; and/or

The angle of attack of the blade is 20.9 ± 3 degrees at a distance of 30.2% of the radius of the paddle from the center of the paddle; and/or

The angle of attack of the blade is 17.7 ± 3 degrees at a distance of 40.17% of the radius of the paddle from the center of the paddle;

At an angle of 60.11% of the radius of the paddle from the center of the paddle, the blade has an angle of attack of 12.2 ± 3 degrees; and/or

The blade is attacked at a distance of 80.06% of the radius of the paddle from the center of the paddle An angle of 6.8 ± 3 degrees; and / or

At an angle from the center of the paddle to the paddle, the blade has an angle of attack of 7.5 ± 3 degrees.

Further, the paddle has a diameter of 700 mm, and the blade has an angle of attack of 23.2 ± 3 degrees at a distance of 70.4 mm from the center of the paddle; and/or

At an angle of 105.7 mm from the center of the paddle, the blade has an angle of attack of 20.9 ± 3 degrees; and/or

The blade has an angle of attack of 17.7 ± 3 degrees at a distance of 140.6 mm from the center of the paddle; and/or

The angle of attack of the blade is 14.4 ± 3 degrees at a distance of 175.5 mm from the center of the paddle; and/or

The angle of attack of the blade is 12.2 ± 3 degrees at a distance of 210.4 mm from the center of the paddle; and/or

The blade has an angle of attack of 10.5 ± 3 degrees at a distance of 245.3 mm from the center of the paddle; and/or

At an angle of 280.2 mm from the center of the paddle, the blade has an angle of attack of 6.8 ± 3 degrees; and/or

At an angle of 315.1 mm from the center of the paddle, the blade has an angle of attack of 8 ± 3 degrees; and/or

The blade has an angle of attack of 7.5 ± 3 degrees at a distance of 350 mm from the center of the paddle.

Further, at a distance of 50.14% of the radius of the paddle from the center of the paddle, the chord length of the blade is 50.08±5 mm; and/or

The chord length of the blade is 41.53 ± 5 mm at a distance of 70.08% of the radius of the paddle from the center of the paddle; and/or

The chord length of the blade is 32.42 ± 5 mm at a distance of 90.03% of the radius of the paddle from the center of the paddle.

Further, at a distance of 20.11% of the radius of the paddle from the center of the paddle, the chord length of the paddle is 41.94±5 mm; and/or

The chord length of the blade is 56.42 ± 5 mm at a distance of 30.2% of the radius of the paddle from the center of the paddle; and/or

The chord length of the blade is 53.82 ± 5 mm at a distance of 40.17% of the radius of the paddle from the center of the paddle; and/or

The chord length of the blade is 45.89 ± 5 mm at a distance of 60.11% of the radius of the paddle from the center of the paddle; and/or

The chord length of the blade is 36.85 ± 5 mm at a distance of 80.06% of the radius of the paddle from the center of the paddle; and/or

At a radius from the center of the paddle to the paddle, the blade has a chord length of 28.08 ± 5 mm.

Further, the paddle has a diameter of 700±30 mm;

Or/and, the length of the blade is 325 ± 30 mm.

Further, the paddle includes a downwardly facing leaf surface, an upward leaf back, a first side edge connecting one side of the leaf back and the leaf surface, and a connecting the leaf back and the leaf surface The second side edge of the other side, the cross section of the leaf face and the cross section of the blade back are both curved.

Further, the leaf surface includes a first bulging portion that protrudes downward; the first side edge includes a curved outwardly convex second bulging portion; and the second side edge includes a curved surface a third arched portion that protrudes outward.

Further, the first arching portion, the second arching portion and the third arching portion are both near the center of the paddle.

Further, the number of the blades is two, and the two blades are centrally symmetric with respect to the center of the paddle;

Or/and the thickness of the end of the blade away from the center of the paddle is less than the thickness of other portions of the blade.

Further, the propeller is a folding paddle, and the propeller includes a paddle that is rotatably coupled to the blade, the number of the blades being at least two;

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

a propeller, the propeller being a folding paddle comprising a paddle and at least two blades rotatably coupled to the paddle;

The paddle formed by the blade has a diameter of 700±30 mm, and the length of the paddle is 325±30 mm;

At an angle of 30.2% of the radius of the paddle from the center of the paddle, the blade has an angle of attack of 20.9 ± 3 degrees and the blade has a chord length of 56.42 ± 5 mm; The center of the paddle is 50.14% of the radius of the paddle, the blade has an angle of attack of 14.4 ± 3 degrees, the blade has a chord length of 50.08 ± 5 mm; at the center of the paddle At 70.08% of the radius of the paddle, the blade has an angle of attack of 10.5 ± 3 degrees and the blade has a chord length of 41.53 ± 5 mm.

A power kit for an unmanned aerial vehicle, the power kit comprising a propeller as described above;

A motor for driving the propeller to rotate, the motor having a KV value of 120.

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 of the present invention reduces the air resistance, improves the efficiency, increases the flight distance 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.

DRAWINGS

1 is a schematic structural view of a positive paddle according to an embodiment of the present invention.

Fig. 2 is a structural schematic view showing another angle of the front paddle of Fig. 1.

Figure 3 is a schematic view showing the structure of the blade of Figure 2;

4 is a cross-sectional view of the A-A section of the blade of FIG. 2, the A-A section being 70.4 mm from the center of the paddle of the propeller.

Figure 5 is a cross-sectional view of the B-B section of the paddle of Figure 2 with the B-B section 105.7 mm from the center of the paddle of the propeller.

Figure 6 is a cross-sectional view of the C-C section of the paddle of Figure 2 with the C-C section 140.6 mm from the center of the paddle of the propeller.

Figure 7 is a cross-sectional view of the D-D section of the paddle of Figure 2 with the D-D profile 175.5 mm from the center of the paddle of the propeller.

Figure 8 is a cross-sectional view of the E-E section of the paddle of Figure 2 with the E-E section 210.4 mm from the center of the propeller paddle.

Figure 9 is a cross-sectional view of the F-F section of the paddle of Figure 2 with the F-F profile 245.3 mm from the center of the paddle of the propeller.

Figure 10 is a cross-sectional view of the G-G section of the paddle of Figure 2 with the G-G profile 280.2 mm from the center of the paddle of the propeller.

Figure 11 is a cross-sectional view of the H-H section of the paddle of Figure 2 with the H-H profile 315.1 mm from the center of the propeller paddle.

Figure 12 is a cross-sectional view of the I-I section of the paddle of Figure 2 with the I-I section 350 mm from the center of the paddle of the propeller.

Main component symbol description

正桨 Positive paddle	100100
桨座 Paddle	101101
桨叶 Paddle	200200
叶面 Leaf surface	1010
第一拱起部 First arch	1111
叶背Leaf back	2020
第一侧缘 First side edge	3030
第二拱起部 Second arch	3131
第二侧缘 Second side edge	4040
第三拱起部 Third arch	4141
连接件 Connector	5050
连接孔 Connection hole	5151

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 one A component is considered to be "set to" another component, which can be set directly on another component or possibly a centered component.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. 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 of the propeller and the chord length. For this reason, the inventors have made some improvements in this respect.

(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.

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 other 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 member is a motor, and the KV value of the motor is 120; it can be understood that in other embodiments, the driving 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 clockwise 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 counterclockwise 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.

Specifically, in the embodiment, the plurality of arms are plural, and the propeller and the driving member are all plural, and each driving member drives one of the propellers to rotate to form a power set. At least one set of the power kit is provided on each arm.

In addition, the upper and lower orientation terms appearing in the present embodiment are based on the conventional running posture of the propeller and the aircraft after the propeller is mounted on the aircraft, and should not be used as a reference. The description is considered to be restrictive.

Referring to FIG. 1 to FIG. 3 , a positive paddle 100 is provided according to an embodiment of the present invention. The front paddle 100 includes a paddle 101 and two blades 200 disposed on two sides of the paddle 101 . The two blades 200 are centrally symmetrical about the center of the paddle 101. The two blades 200 are rotated to form a paddle. In the present embodiment, the center of the paddle 101 substantially coincides with the center of the paddle. Of course, in other embodiments, the positive paddle 100 is a straight paddle, and the positive paddle 100 includes a hub and two blades 200 that are fixedly coupled to the hub.

In this embodiment, the paddle has a diameter of 700 ± 30 mm. Specifically, the paddle may have a diameter of 670 mm, 680 mm, 690 mm, 700 mm, 710 mm, 730 mm, or any value within a range of values defined by any two of the above values. Preferably, the paddle has a diameter of 700 mm. It can be understood that the paddles 200 and the paddles 101 can be integrally formed or connected to each other by a connecting member. Of course, the number of the blades 200 may be other numbers according to actual needs; as in another embodiment, the number of the blades 200 is three, and the three blades 200 are opposite to the paddles. The centers are evenly spaced 120 degrees apart in the circumferential direction; in other embodiments, the blades 200 are rotatably coupled to the paddles 101.

The paddle 101 can be used to connect with a rotating shaft of a driving member of the unmanned aerial vehicle to enable the driving member to drive the positive paddle 100 to rotate. A reinforcing spacer may be embedded in the paddle 101, and the reinforcing piece may be made of a lightweight high-strength material such as aluminum alloy to improve the strength of the propeller.

Each of the blades 200 includes a downwardly facing leaf surface 10, an upwardly facing leaf back 20, a first side edge 30 connecting the leaf back 20 and a side of the leaf surface 10, and a connection to the leaf back 20 And a second side edge 40 of the other side of the foliar surface 10.

In one embodiment, the foliage 10 and the blade back 20 are curved surfaces. The foliar surface 10 includes a first bulging portion 11 that projects downwardly, the first bulging portion 11 being smoothly transitionally connected to other portions of the foliar surface 10. In the present embodiment, the first arching portion 11 is adjacent to one end of the blade 200 connected to the paddle 101. The first side edge 30 includes a curved, outwardly projecting second bulge 31. The second arched portion 31 is smoothly transitionally connected to other portions of the first side edge 30. In the present embodiment, the second arching portion 31 is adjacent to one end of the blade 200 connected to the paddle 101. The second side edge 40 includes a curved, outwardly projecting third bulge 41 that is smoothly transitionally connected to other portions of the second side edge 40. Present implementer In the formula, the third arching portion 41 is close to one end of the blade 200 connected to the paddle 101, that is, the third arching portion 41 is close to the center of the paddle.

The blade 200 also includes a connector 50 that is coupled to the paddle 101 by the connector 50. In the present embodiment, the connecting member 50 is provided with a connecting hole 51, and a distance L between a central axis of the connecting hole 51 and a center O of the paddle is about 35 mm. The connecting member 50 is connected to the paddle 101 through the connecting hole 51.

In the present embodiment, the blade 200 is not sharply twisted, the stress is small, the structural strength is high, the fracture is not easy, and the reliability is high. One end of the blade 200 away from the paddle 101 is the thinnest portion of the paddle 200, which is advantageous for reducing air resistance. That is, the thickness of one end of the blade 200 away from the center of the paddle is less than the thickness of other portions of the paddle 200.

In the present embodiment, the length of the blade 200 is 325 ± 30 mm. The length of the blade 200 may be any value between 295 mm and 355 mm, such as 305 mm, 315 mm, 325 mm, 335 mm, 345 mm, 355 mm, or a range of values defined by any two of the above values. Any value within. Preferably, the blade 200 has a length of 325 mm.

The angle of attack referred to herein refers to the angle between the chord of the blade 200 and the velocity of the incoming flow. The angle of attack of the blade 200 is 23.2 ± 3 degrees at a distance O from the center O of the paddle at 20.11% of the radius of the paddle. The angle of attack of the blade 200 may be 20.2 degrees, 21.2 degrees, 22.2 degrees, 23.2 degrees, 24.2 degrees, 25.2 degrees, 26.2 degrees, or a value within a numerical range defined by any two of the above values. In this embodiment, It is 23.2 degrees. The chord length of the blade 200 is 41.94 ± 5 mm at a distance O from the center O of the paddle at 20.11% of the radius of the paddle. The chord length of the blade 200 may be 36.94 mm, 38.94 mm, 40.94 mm, 42.94 mm, 44.94 mm, 46.94 mm, or a value within a numerical range defined by any two of the above values, which is 41.94 mm in the present embodiment. .

The angle of attack of the blade 200 is 20.9 ± 3 degrees at a distance O from the center O of the paddle that is 30.2% of the radius of the paddle. The angle of attack of the blade 200 may be 17.9 degrees, 18.9 degrees, 19.9 degrees, 20.9 degrees, 21.9 degrees, 22.9 degrees, 23.9 degrees, or a value within a numerical range defined by any two of the above values. In this embodiment, It is 20.9 degrees. At a distance O from the center O of the paddle to 30.2% of the radius of the paddle, the chord length of the blade 200 is 56.42 ± 5 mm. The chord length of the blade 200 may be 51.42 mm, 53.42 mm, 55.42 mm, 57.42 mm, 59.42 mm, 61.42 mm, or a value within a numerical range defined by any two of the above values, the present embodiment In the formula, it is 56.42 mm.

The angle of attack of the blade 200 is 17.7 ± 3 degrees at a distance O from the center O of the paddle at 40.17% of the radius of the paddle. The angle of attack of the blade 200 may be 14.7 degrees, 15.7 degrees, 16.7 degrees, 17.7 degrees, 18.7 degrees, 19.7 degrees, 20.7 degrees, or a value within a numerical range defined by any two of the above values. In this embodiment, It is 17.7 degrees. The chord length of the blade 200 is 53.82 ± 5 mm at a distance O from the center O of the paddle at 40.17% of the radius of the paddle. The chord length of the blade 200 may be 48.82 mm, 50.82 mm, 52.82 mm, 54.82 mm, 56.82 mm, 58.82 mm, or a value within a numerical range defined by any two of the above values, which is 53.82 mm in the present embodiment. .

The angle of attack of the blade 200 is 14.4 ± 3 degrees at a distance O from the center O of the paddle at 50.14% of the radius of the paddle. The angle of attack of the blade 200 may be 11.4 degrees, 12.4 degrees, 13.4 degrees, 14.4 degrees, 15.4 degrees, 16.4 degrees, 17.4 degrees, or a value within a numerical range defined by any two of the above values. In this embodiment, It is 14.4 degrees. The chord length of the blade 200 is 50.08 ± 5 mm at a distance O from the center O of the paddle at 50.14% of the radius of the paddle. The chord length of the blade 200 may be 45.08 mm, 47.08 mm, 49.08 mm, 51.08 mm, 53.08 mm, 55.08 mm, or a value within a numerical range defined by any two of the above values, which is 50.08 mm in the present embodiment. .

The angle of attack of the blade 200 is 12.2 ± 3 degrees at a distance O from the center O of the paddle that is 60.11% of the radius of the paddle. The angle of attack of the blade 200 may be 9.2 degrees, 10.2 degrees, 11.2 degrees, 12.2 degrees, 13.2 degrees, 14.2 degrees, 15.2 degrees, or a value within a numerical range defined by any two of the above values. In this embodiment, It is 12.2 degrees. The chord length of the blade 200 is 45.89 ± 5 mm at a distance O from the center O of the paddle at 60.11% of the radius of the paddle. The chord length of the blade 200 may be 40.89 mm, 42.89 mm, 44.89 mm, 46.89 mm, 48.89 mm, 50.89 mm, or a value within a numerical range defined by any two of the above values, which is 45.89 mm in the present embodiment. .

The angle of attack of the blade 200 is 10.5 ± 3 degrees at a distance of 70.08% from the center O of the paddle. The angle of attack of the blade 200 may be 7.5 degrees, 8.5 degrees, 9.5 degrees, 10.5 degrees, 11.5 degrees, 12.5 degrees, 13.5 degrees, or a value within a numerical range defined by any two of the above values. In this embodiment, It is 10.5 degrees. The chord length of the blade 200 is 41.53 ± 5 mm at a distance of 70.08% from the center O of the paddle. The blade 200 The chord length may be 36.53 mm, 38.53 mm, 40.53 mm, 42.53 mm, 44.53 mm, 46.53 mm, or a numerical value defined by any two of the above values, which is 41.53 mm in the present embodiment.

The angle of attack of the blade 200 is 6.8 ± 3 degrees at a distance O from the center O of the paddle at 80.06% of the radius of the paddle. The angle of attack of the blade 200 may be 3.8 degrees, 4.8 degrees, 5.8 degrees, 6.8 degrees, 7.8 degrees, 8.8 degrees, 9.8 degrees, or a value within a numerical range defined by any two of the above values. In this embodiment, It is 6.8 degrees. The chord length of the blade 200 is 36.85 ± 5 mm at a distance of 80.06% from the center O of the paddle. The chord length of the blade 200 may be 31.85 mm, 33.85 mm, 35.85 mm, 37.85 mm, 39.85 mm, 41.85 mm, or a value within a numerical range defined by any two of the above values, which is 36.85 mm in the present embodiment. .

The angle of attack of the blade 200 is 8 ± 3 degrees at a distance O from the center O of the paddle at 90.03% of the radius of the paddle. The angle of attack of the blade 200 may be 5 degrees, 6 degrees, 7 degrees, 8 degrees, 9 degrees, 10 degrees, 11 degrees, or a value within a numerical range defined by any two of the above values. In this embodiment, It is 8 degrees. The chord length of the blade 200 is 32.42 ± 5 mm at a distance of 90.03% from the center O of the paddle. The chord length of the blade 200 may be 27.42 mm, 29.42 mm, 31.42 mm, 33.42 mm, 35.42 mm, 37.42 mm, or a value within a numerical range defined by any two of the above values, which is 32.42 mm in the present embodiment. .

The angle of attack of the blade 200 is 7.5 ± 3 degrees at a radius from the center O of the paddle to the paddle. The angle of attack of the blade 200 may be 4.5 degrees, 5.5 degrees, 6.5 degrees, 7.5 degrees, 8.5 degrees, 9.5 degrees, 10.5 degrees, or a value within a range of values defined by any two of the above values, in this embodiment It is 7.5 degrees. The chord length of the blade 200 is 28.08 ± 5 mm at a radius from the center of the paddle to the paddle. The chord length of the blade 200 may be 23.08 mm, 25.08 mm, 27.08 mm, 29.08 mm, 31.08 mm, 33.08 mm, or a value within a numerical range defined by any two of the above values, which is 28.08 mm in the present embodiment. .

Referring to FIG. 4 to FIG. 12, in the embodiment, the paddle has a diameter of 700 mm. At an angle of 70.4 mm from the center of the paddle, the angle of attack of the blade 200 is 23.2 degrees, the chord length L1 of the blade 200 is 41.94 mm; at a distance of 105.7 mm from the center of the paddle, The angle of attack of the blade 200 is 20.9 degrees, the chord length L2 of the blade 200 is 56.42 mm, and the angle of attack of the blade 200 is 17.7 degrees at a distance of 140.6 mm from the center of the paddle. Blade 200 The chord length L3 is 53.82 mm; the angle of attack of the blade 200 is 14.4 degrees at a distance of 175.5 mm from the center of the paddle, and the chord length L4 of the blade 200 is 50.08 mm; The center of the disk is 210.4 mm, the angle of attack of the blade 200 is 12.2 degrees, the chord length L5 of the blade 200 is 45.89 mm, and the blade 200 is at a distance of 245.3 mm from the center of the paddle. The angle of attack is 10.5 degrees, the chord length L6 of the blade 200 is 41.53 mm; at an angle of 280.2 mm from the center of the paddle, the angle of attack of the blade 200 is 6.8 degrees, the chord of the blade 200 The length L7 is 36.85 mm; at an angle of 315.1 mm from the center of the paddle, the angle of attack of the blade 200 is 8 degrees, the chord length L8 of the blade 200 is 32.42 mm; at a distance from the paddle At an angle of 350 mm at the center, the angle of attack of the blade 200 is 7.5 degrees, and the chord length L9 of the blade 200 is 28.08 mm.

Please refer to Table 1. Table 1 shows the comparison of the test results of the propeller provided by the present embodiment with an existing propeller. As can be seen from the table, the tension/shaft power of the propeller provided by the present embodiment is larger than the tension/shaft power of the existing propeller, that is, the propeller provided by the present embodiment can provide the same power input. The larger pulling force; that is, the propeller provided by the embodiment can provide the same pulling force with less power input, thereby saving power consumption, increasing the following distance and improving efficiency. In the case where the same pulling force is provided, the power consumption of the propeller provided by the present embodiment can be reduced by 3% to 10%. Under the same conditions, the maximum pulling force that the propeller provided by the embodiment can provide is increased by 30%-50%, so that the propeller is more operable and more accelerating in actual flight.

The propeller provided by the invention reduces the air resistance, improves the efficiency, increases the flight distance 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 the spirit of the invention is Appropriate changes and modifications to the above embodiments are intended to fall within the scope of the invention.

Claims

A propeller comprising a paddle that rotates to form a paddle, characterized in that the blade is attacked at a distance of 50.14% of the radius of the paddle from the center of the paddle The angle is 14.4 ± 3 degrees; at an angle of 70.08% of the radius of the paddle from the center of the paddle, the blade has an angle of attack of 10.5 ± 3 degrees; at a distance from the center of the paddle At 90.03% of the radius of the paddle, the blade has an angle of attack of 8 ± 3 degrees.
The propeller according to claim 1, wherein said blade has an angle of attack of 23.2 ± 3 degrees at a distance of 20.11% of a radius of said paddle from a center of said paddle; and/or

The angle of attack of the blade is 20.9 ± 3 degrees at a distance of 30.2% of the radius of the paddle from the center of the paddle; and/or

The angle of attack of the blade is 17.7 ± 3 degrees at a distance of 40.17% of the radius of the paddle from the center of the paddle;

At an angle of 60.11% of the radius of the paddle from the center of the paddle, the blade has an angle of attack of 12.2 ± 3 degrees; and/or

The angle of attack of the blade is 6.8 ± 3 degrees at a distance of 80.06% of the radius of the paddle from the center of the paddle; and/or

At an angle from the center of the paddle to the paddle, the blade has an angle of attack of 7.5 ± 3 degrees.
A propeller according to claim 1, wherein said paddle has a diameter of 700 mm, and said blade has an angle of attack of 23.2 ± 3 degrees at a distance of 70.4 mm from the center of said paddle; and / or

At an angle of 105.7 mm from the center of the paddle, the blade has an angle of attack of 20.9 ± 3 degrees; and/or

The blade has an angle of attack of 17.7 ± 3 degrees at a distance of 140.6 mm from the center of the paddle; and/or

The angle of attack of the blade is 14.4 ± 3 degrees at a distance of 175.5 mm from the center of the paddle; and/or

The angle of attack of the blade is 12.2 ± 3 degrees at a distance of 210.4 mm from the center of the paddle; and/or

The blade has an angle of attack of 10.5 ± 3 degrees at a distance of 245.3 mm from the center of the paddle; and/or

At an angle of 280.2 mm from the center of the paddle, the blade has an angle of attack of 6.8 ± 3 degrees; and/or

At an angle of 315.1 mm from the center of the paddle, the blade has an angle of attack of 8 ± 3 degrees; and/or

The blade has an angle of attack of 7.5 ± 3 degrees at a distance of 350 mm from the center of the paddle.
The propeller according to claim 1, wherein said blade has a chord length of 50.08 ± 5 mm at a distance of 50.14% of a radius of said paddle from a center of said paddle; and/or

The chord length of the blade is 41.53 ± 5 mm at a distance of 70.08% of the radius of the paddle from the center of the paddle; and/or

The chord length of the blade is 32.42 ± 5 mm at a distance of 90.03% of the radius of the paddle from the center of the paddle.
A propeller according to claim 4, wherein said blade has a chord length of 41.94 ± 5 mm at a distance of 20.11% of the radius of said paddle from the center of said paddle; and/or

The chord length of the blade is 56.42 ± 5 mm at a distance of 30.2% of the radius of the paddle from the center of the paddle; and/or

The chord length of the blade is 53.82 ± 5 mm at a distance of 40.17% of the radius of the paddle from the center of the paddle; and/or

The chord length of the blade is 45.89 ± 5 mm at a distance of 60.11% of the radius of the paddle from the center of the paddle; and/or

The chord length of the blade is 36.85 ± 5 mm at a distance of 80.06% of the radius of the paddle from the center of the paddle; and/or

At a radius from the center of the paddle to the paddle, the blade has a chord length of 28.08 ± 5 mm.
The propeller according to claim 1, wherein said paddle has a diameter of 700 ± 30 mm;

Or/and, the length of the blade is 325 ± 30 mm.
A propeller according to claim 1 wherein said blade includes a downwardly facing blade face, an upwardly facing blade back, a first side edge connecting said leaf back and said leaf face, and a connection The leaf back and A second side edge of the other side of the foliate, the cross section of the foliar surface and the cross section of the leaf back are both curved.
A propeller according to claim 7, wherein said foliate includes a first bulging portion that protrudes downward; said first side edge includes a curved second outwardly projecting second bulging portion; The second side edge includes a curved, outwardly projecting third bulge.
A propeller according to claim 8, wherein said first arching portion, said second arching portion and said third arching portion are both adjacent to a center of said paddle.
A propeller according to claim 1, wherein said number of blades is two, and said two said blades are centrally symmetrical with respect to a center of said paddle;

Or/and the thickness of the end of the blade away from the center of the paddle is less than the thickness of other portions of the blade.
A propeller according to claim 1, wherein said propeller is a folding paddle, and said propeller includes a paddle rotatably coupled to said blade, said number of said blades being at least two;

Alternatively, the propeller includes a hub that is fixedly coupled to the blade, the number of the blades being at least two.
A propeller, wherein the propeller is a folding paddle, comprising a paddle and at least two blades rotatably coupled to the paddle;

The paddle formed by the blade has a diameter of 700±30 mm, and the length of the paddle is 325±30 mm;

At an angle of 30.2% of the radius of the paddle from the center of the paddle, the blade has an angle of attack of 20.9 ± 3 degrees and the blade has a chord length of 56.42 ± 5 mm; The center of the paddle is 50.14% of the radius of the paddle, the blade has an angle of attack of 14.4 ± 3 degrees, the blade has a chord length of 50.08 ± 5 mm; at the center of the paddle At 70.08% of the radius of the paddle, the blade has an angle of attack of 10.5 ± 3 degrees and the blade has a chord length of 41.53 ± 5 mm.
A power kit for an unmanned aerial vehicle, characterized in that the power kit comprises the propeller according to any one of claims 1 to 12;

A motor for driving the propeller to rotate, the motor having a KV value of 120.
An unmanned aerial vehicle comprising a fuselage, a plurality of arms and a plurality of power sets according to claim 13, wherein the plurality of arms are connected to the body, and the plurality of power sets are respectively installed in the On multiple arms.