CN218172586U

CN218172586U - Flexible propeller and power device

Info

Publication number: CN218172586U
Application number: CN202222901964.6U
Authority: CN
Inventors: 胡华智; 丁凯
Original assignee: Ehang Intelligent Equipment Guangzhou Co Ltd
Current assignee: Ehang Intelligent Equipment Guangzhou Co Ltd
Priority date: 2022-11-02
Filing date: 2022-11-02
Publication date: 2022-12-30
Anticipated expiration: 2032-11-02

Abstract

The utility model discloses a flexible propeller, which comprises a blade, a buffer cushion and a connecting assembly, wherein the blade is provided with a head end and a tail end, the tail end of the blade is provided with a mounting hole, the connecting assembly is provided with a connecting column, the connecting column is arranged in the mounting hole in a penetrating way, a gap is arranged between the connecting column and the mounting hole, and the buffer cushion is arranged between the blade and the connecting assembly; the paddle is connected with the connecting assembly through the mounting hole and the connecting column, the paddle is not rigidly connected with the connecting assembly but has a certain gap, and a buffer pad is arranged between the paddle and the connecting assembly and used for absorbing the vibration of the paddle and allowing the paddle to swing relative to the connecting assembly to avoid the accumulation of vibration energy.

Description

Flexible propeller and power device

Technical Field

The utility model relates to an airborne vehicle technical field especially relates to a flexible screw and power device.

Background

At present, large-scale many rotor crafts generally evolve by unmanned aerial vehicle and come, and two leaf rigidity screw are adopted more to this kind of large-scale many rotor crafts. The rigid propeller has extremely simple structure and is easy to produce and manufacture. When the rigid propeller is applied to the small unmanned aerial vehicle, the rigidity of the rigid propeller is larger for the size of the rigid propeller, so that the resonance frequency of the rigid propeller is higher, and the resonance frequency of the rigid propeller cannot be reached in the flying process of the small unmanned aerial vehicle. However, when rigid propellers are used on large multi-rotor aircraft, the problem of resonance of the rigid propellers becomes significant. The resonance frequency of the multi-rotor aircraft falls within the excitation frequency of the large multi-rotor aircraft, so that the whole aircraft can generate harmful vibration under certain conditions, normal operation of the flight attitude sensor can be influenced, and even fatigue of structural members can be brought, so that the service life of the aircraft is shortened.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a flexible screw and a power device to solve the problem that the current rigid screw easily produces harmful vibration with a multi-rotor aircraft.

The purpose of the utility model is realized by adopting the following technical scheme:

a flexible propeller comprising a blade, a cushion pad and a connection assembly;

the blade is provided with a head end and a tail end, and the tail end of the blade is provided with a mounting hole;

be equipped with the spliced pole on the coupling assembling, the spliced pole wears to locate there is the clearance between mounting hole and the two, the blotter is located between paddle and the coupling assembling.

In some optional embodiments, the cushion pad is ring-shaped, and the connecting column is sleeved with the cushion pad.

In some optional embodiments, the connecting assembly includes a first connecting plate and a second connecting plate arranged in parallel, two ends of the connecting column are respectively and fixedly connected to the first connecting plate and the second connecting plate, the paddle is located between the first connecting plate and the second connecting plate, the number of the cushions is multiple, two cushions are arranged at the tail end of each paddle, and the two cushions of the paddle are respectively connected to the first connecting plate and the second connecting plate.

In some optional embodiments, the number of the paddles is provided with a plurality, the number of the connecting columns is provided with a plurality, each paddle corresponds to one connecting column, and the connecting columns are uniformly arranged around the first connecting plate.

In some optional embodiments, the first connecting plate is circular, a circle of connecting holes is circumferentially formed on the first connecting plate, each connecting hole corresponds to one connecting column, and the connecting columns are fixedly connected to the connecting holes.

In some optional embodiments, the cushion pad is made of rubber.

In some optional embodiments, a cylindrical buffer sleeve is further disposed between the two buffer pads on each blade, two ends of the buffer sleeve are respectively connected to the two buffer pads, and the buffer sleeve is sleeved on the connecting column.

In some optional embodiments, a first boss is disposed on the first connecting plate, a first groove is disposed on the cushion pad connected to the first connecting plate, and the first boss is embedded in the first groove.

In some optional embodiments, a second boss is disposed on the second connecting plate, a second groove is disposed on the cushion pad connected to the second connecting plate, and the second boss is embedded in the second groove.

In order to solve the same technical problem, the utility model also provides a power device, including the motor and as above flexible screw, coupling assembling fixed connection in the main shaft of motor.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the paddle is connected with the connecting assembly through the mounting hole and the connecting column, the paddle is not rigidly connected with the connecting assembly but has a certain gap, and a buffer cushion is arranged between the paddle and the connecting assembly and used for absorbing the vibration of the paddle and allowing the paddle to swing relative to the connecting assembly, so that the vibration energy accumulation is avoided.

Drawings

Fig. 1 is a schematic view of the overall structure of the flexible propeller of the utility model;

fig. 2 is an exploded schematic view of the flexible propeller of the utility model;

FIG. 3 is an enlarged schematic view at A in FIG. 2;

in the figure: 10. a paddle; 20. a cushion pad; 30. connecting columns; 40. a first connecting plate; 41. a first boss; 50. a second connecting plate; 51. a second boss; 60. a buffer sleeve.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for purposes of illustration only.

Unless defined otherwise, 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. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1

Referring to fig. 1 to 3, a flexible propeller of the present invention is schematically shown, which includes a blade 10, a cushion pad 20 and a connecting assembly.

The blade 10 has a head end and a tail end, and the tail end of the blade 10 is provided with a mounting hole. The connecting column 30 is arranged on the connecting component, the connecting column 30 penetrates through the mounting hole, a gap is reserved between the connecting column 30 and the mounting hole, and the cushion pad 20 is arranged between the paddle 10 and the connecting component. The cushion 20 not only absorbs the shock generated by the blade 10, but also allows the blade 10 to oscillate relative to the attachment assembly to avoid the build up of shock energy. Wherein, the cushion pad 20 is ring-shaped, and the connecting column 30 is sleeved with the cushion pad 20.

The vibration of the aircraft mainly comes from the following three conditions (taking a two-blade paddle as an example): 1. the speed of two blades 10 when flying in a certain direction of the aircraft will add a travel speed to the leading blade 10 and the trailing blade 10, and the speed of the addition is just an increase or decrease in speed. The increase or decrease of the speed will bring about the change of the lift force. Which is a periodic variation related to the motor speed. If the periodic lift force change acts on the traditional rigid propeller, the periodic deformation of the propeller is brought, and the elastic potential energy is accumulated on the propeller. If the vibrations are comparable to the fixed frequency of the blade 10, a persistent resonance is caused. However, this phenomenon, when acting on a flexible paddle: for the advancing blade 10, due to the rising of the lift force, the blade 10 can automatically flap upwards, the flap upwards reduces the attack angle with the airflow, so that the lift force is reduced, the lift force of each blade 10 is kept unchanged, and the vibration caused by the deformation of the blade 10 can not be brought. Due to the fact that each blade 10 swings up and down, the angular speed in the oscillation direction can be automatically increased and decreased due to the principle of conservation of angular momentum, the rotating mass center of the blade 10 is maintained on the shaft, and eccentric oscillation is reduced. Because the swinging and the vibration are realized by adopting the deformation and the friction of the cushion pad 20, the inertia energy of the system can be consumed, and the vibration energy can be quickly consumed in the form of friction heat without causing large-amplitude co-vibration. 2. When the flight attitude of the aircraft changes, the change of the paddle plane of the paddle 10 lags the paddle axis by 90 degrees due to the gyroscopic effect of the paddle 10. This change, if a rigid propeller, will cause elastic deformation, creating a shock. And just to the utility model discloses a flexible screw only can take place to wave and shake with the pendulum, can not cause the vibrations energy to pile up. 3. The fluctuation of the torque brings about a swinging motion to the flexible paddle, and the vibration is also inhibited.

Further, coupling assembling includes parallel arrangement's first connecting plate 40 and second connecting plate 50, and the both ends of spliced pole 30 are fixed connection in first connecting plate 40 and second connecting plate 50 respectively, and the paddle 10 is located between first connecting plate 40 and the second connecting plate 50, and the quantity of blotter 20 is equipped with a plurality ofly, and the tail end of every paddle 10 is equipped with two blotters 20, and two blotters 20 of paddle 10 connect respectively in first connecting plate 40 and second connecting plate 50. The first connecting plate 40 and the second connecting plate 50 clamp the blade 10 at both sides of the blade 10, and stable connection of the blade 10 is realized.

The quantity of paddle 10 is equipped with a plurality ofly, and the quantity of spliced pole 30 is equipped with a plurality ofly, and every paddle 10 corresponds a spliced pole 30, and a plurality of spliced poles 30 encircle first connecting plate 40 evenly and set up. The number of blades 10 can be increased or decreased according to the actual requirements of the aircraft. Specifically, the first connecting plate 40 is circular, a circle of connecting holes are circumferentially arranged on the first connecting plate 40, each connecting hole corresponds to one connecting column 30, and the connecting columns 30 are fixedly connected to the connecting holes. The circular first connecting plate 40 can mount two or more numbers of blades 10.

The buffer pads 20 are made of rubber materials, a cylindrical buffer sleeve 60 is further arranged between the two buffer pads 20 on each blade 10, two ends of the buffer sleeve 60 are respectively connected to the two buffer pads 20, the connecting column 30 is sleeved with the buffer sleeve 60, and the connecting column 30 and the blades 10 can be separated by the buffer sleeve 60 so as to prevent vibration energy of the blades 10 from being directly transmitted to the connecting column 30.

In order to avoid the abnormal displacement between the cushion pad 20 and the first connecting plate 40 or the second connecting plate 50, the first connecting plate 40 is provided with a first boss 41, the cushion pad 20 connected with the first connecting plate 40 is provided with a first groove, and the first boss 41 is embedded in the first groove; the second connecting plate 50 is provided with a second boss 51, the cushion pad 20 connected with the second connecting plate 50 is provided with a second groove, and the second boss 51 is embedded in the second groove.

Example 2

In order to solve the same technical problem, the present embodiment provides a power device, which includes a motor and the flexible propeller as described above, and the connecting assembly is fixedly connected to the main shaft of the motor.

In summary, the paddle 10 is connected to the connecting assembly through the mounting hole and the connecting column 30, the paddle 10 is not rigidly connected to the connecting assembly but has a gap, and the cushion pad 20 is disposed between the paddle 10 and the connecting assembly for absorbing the vibration of the paddle 10 and allowing the paddle 10 to swing relative to the connecting assembly, thereby avoiding the accumulation of vibration energy.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A flexible propeller is characterized by comprising a paddle, a buffer pad and a connecting assembly;

2. The flexible propeller of claim 1 wherein the cushion is ring-shaped and is disposed around the connecting column.

3. The flexible propeller of claim 1, wherein the connecting assembly comprises a first connecting plate and a second connecting plate arranged in parallel, two ends of the connecting column are fixedly connected to the first connecting plate and the second connecting plate respectively, the paddle is located between the first connecting plate and the second connecting plate, the number of the cushions is provided in plurality, two cushions are provided at the tail end of each paddle, and two cushions of the paddle are connected to the first connecting plate and the second connecting plate respectively.

4. The flexible propeller of claim 3 wherein there are a plurality of said blades and a plurality of said connecting posts, one connecting post for each of said blades, and a plurality of said connecting posts are uniformly disposed around said first connecting plate.

5. The flexible propeller of claim 4 wherein said first connecting plate is circular and has a ring of attachment holes circumferentially disposed thereon, each attachment hole corresponding to one of said attachment posts, said attachment posts being fixedly attached to said attachment holes.

6. The flexible propeller of claim 1, wherein the cushion is made of a rubber material.

7. The flexible propeller of claim 3, wherein a cylindrical buffer sleeve is further disposed between the two buffer pads on each blade, two ends of the buffer sleeve are respectively connected to the two buffer pads, and the buffer sleeve is sleeved on the connecting column.

8. The flexible propeller of claim 7, wherein the first connecting plate is provided with a first boss, the cushion pad connected with the first connecting plate is provided with a first groove, and the first boss is embedded in the first groove.

9. The flexible propeller of claim 7, wherein the second connecting plate is provided with a second boss, the cushion pad connected with the second connecting plate is provided with a second groove, and the second boss is embedded in the second groove.

10. A power plant comprising an electric motor and a flexible propeller as claimed in any one of claims 1 to 9, said connection assembly being fixedly connected to the main shaft of said motor.