阅读说明：本技术 一种减阻螺旋桨及无人机 (Resistance-reducing propeller and unmanned aerial vehicle ) 是由 龚帮民 张立 程灵泉 姜超然 艾剑良 于 2021-10-18 设计创作，主要内容包括：本发明公开了一种减阻螺旋桨及无人机,属于无人机领域。减阻螺旋桨包括电机座、电机、连接套、桨叶和桨叶限位装置；电机固定安装在电机座上,连接套固定连接在电机的输出轴上；桨叶通过桨叶轴可转动地连接在连接套上,桨叶轴垂直于电机的输出轴,桨叶至少有两个且以电机为中心周向均匀布置；每个桨叶与连接套之间均连接有桨叶限位装置,桨叶限位装置用于限制桨叶的转动范围,桨叶的转动范围的两个端点分别对应于桨叶平行于和垂直于电机的输出轴。无人机则包括机身和安装在机身上的减阻螺旋桨。本发明的减阻螺旋桨在应用于飞机上后,桨叶能够在电机工作时张开而提供推力、在电机关闭后收起而减小阻力、在运输和保存时收起而降低尺寸。(The invention discloses a drag reduction propeller and an unmanned aerial vehicle, and belongs to the field of unmanned aerial vehicles. The drag reduction propeller comprises a motor base, a motor, a connecting sleeve, a blade and a blade limiting device; the motor is fixedly arranged on the motor base, and the connecting sleeve is fixedly connected to an output shaft of the motor; the paddle is rotatably connected to the connecting sleeve through a paddle shaft, the paddle shaft is perpendicular to an output shaft of the motor, and at least two paddles are uniformly arranged in the circumferential direction by taking the motor as the center; all be connected with paddle stop device between every paddle and the adapter sleeve, paddle stop device is used for restricting the rotation range of paddle, and two endpoints of the rotation range of paddle are parallel to and perpendicular to the output shaft of motor corresponding to the paddle respectively. The unmanned aerial vehicle comprises a vehicle body and a resistance-reducing propeller installed on the vehicle body. After the drag reduction propeller is applied to an airplane, the blades can be unfolded to provide thrust when the motor works, folded to reduce resistance when the motor is closed, and folded to reduce size when in transportation and storage.)

1. A drag reduction propeller is characterized in that: comprises a motor base, a motor, a connecting sleeve, a blade and a blade limiting device; the motor is fixedly arranged on the motor base, and the connecting sleeve is fixedly connected to an output shaft of the motor; the blades are rotatably connected to the connecting sleeve through blade shafts, the blade shafts are perpendicular to an output shaft of the motor, and at least two blades are uniformly arranged in the circumferential direction by taking the output shaft of the motor as a center; each blade and the connecting sleeve are connected with a blade limiting device, and the blade limiting devices are used for limiting the rotating range of the blades.

2. The drag reducing propeller of claim 1, wherein: the two end points of the rotating range of the paddle correspond to the output shaft of the motor, wherein the paddle is parallel to the output shaft of the motor and is perpendicular to the output shaft of the motor.

3. The drag reducing propeller of claim 1, wherein: the paddle is fixedly connected with the paddle shaft, and the paddle shaft is rotatably connected with the connecting sleeve; the paddle limiting device comprises limiting pieces fixedly connected to the paddle shaft and baffle plates fixedly mounted on the connecting sleeve, wherein the number of the baffle plates is two, and the limiting pieces are limited between the two baffle plates.

4. The drag reducing propeller of claim 3, wherein: the paddle limiting device comprises two limiting pieces, and the two limiting pieces are fixedly mounted on the paddle shafts on two sides of the paddle respectively.

5. The drag reducing propeller of claim 1, wherein: the paddle shaft is in threaded connection with the connecting sleeve.

6. The drag reducing propeller of claim 1, wherein: and the motor base is provided with a lightening hole.

7. The drag reducing propeller of claim 1, wherein: the motor is fixedly provided with a first gasket, and the first gasket is in threaded connection with the motor base.

8. The drag reducing propeller of claim 1, wherein: the output shaft of the motor is connected with a shaft sleeve through a key, and the connecting sleeve is fixedly arranged on the shaft sleeve.

9. The utility model provides an unmanned aerial vehicle, includes the fuselage and connects wing on the fuselage, its characterized in that: the fuselage and/or the wing are provided with a drag reducing propeller as defined in any one of claims 1 to 8; when the blades in the drag reduction propeller are parallel to the output shaft of the motor, the tips of the blades face the rear part of the fuselage.

10. A drone according to claim 9, characterized in that: and a second gasket is fixedly installed on the motor base and is in threaded connection with the fuselage and/or the wing.

Technical Field

The invention relates to the field of unmanned aerial vehicles, in particular to a drag reduction propeller and an unmanned aerial vehicle.

Background

The fixed-wing aircraft can generate the lifting force for flying only by a certain relative speed with the air, and has the characteristics of high flying speed, economy and high carrying capacity due to the principle.

Compared with manned fixed-wing aircrafts, the fixed-wing unmanned aerial vehicle has more advantages in flying scenes with large voyage and high altitude requirements, such as power line patrol, road monitoring and the like. In the measurement field, by carrying surveying and mapping equipment such as a camera, the area of 20 square kilometers can be surveyed once by an electric fixed wing unmanned aerial vehicle with the endurance of 2.5 hours and the speed per hour of 80 kilometers. So high efficiency, the surveying and mapping ability on a large scale for fixed wing unmanned aerial vehicle can demonstrate the value in the emergent rescue after natural disasters such as earthquake, flood take place undoubtedly. If again in the field of patrolling and examining, fixed wing unmanned aerial vehicle also is the sharp ware of long-range patrolling and examining of remote area circuit, pipeline etc..

For a push-back drone, i.e. the engine applies thrust to the drone from the rear side. From the focus, its most electronic equipment and equipment of taking photo by plane all install the head at unmanned aerial vehicle, so when arranging power in unmanned aerial vehicle's back, the focus is better to be adjusted. In addition, because the electronic equipment is arranged at the front part of the unmanned aerial vehicle, the power must be arranged at the rear part, so that the influence of engine vibration on the electronic equipment such as a gyroscope cloud deck and the like is reduced.

But at speed reduction and gliding flight in-process, the screw paddle of engine keeps the expansion state can be unfavorable for flight, leads to flight resistance great, and the paddle of expansion state also does not benefit to unmanned aerial vehicle's transportation and save.

Disclosure of Invention

Aiming at the problems that the blades of a push-back unmanned aerial vehicle in the prior art can bring flight resistance when the unmanned aerial vehicle glides and is inconvenient to transport and store, the invention aims to provide the drag reduction propeller and the unmanned aerial vehicle.

In order to achieve the purpose, the technical scheme of the invention is as follows:

in a first aspect, the invention provides a drag reduction propeller, which comprises a motor base, a motor, a connecting sleeve, a blade and a blade limiting device, wherein the motor base is connected with the motor; the motor is fixedly arranged on the motor base, and the connecting sleeve is fixedly connected to an output shaft of the motor; the blades are rotatably connected to the connecting sleeve through blade shafts, the blade shafts are perpendicular to an output shaft of the motor, and at least two blades are uniformly arranged in the circumferential direction by taking the output shaft of the motor as a center; each blade and the connecting sleeve are connected with a blade limiting device, and the blade limiting devices are used for limiting the rotating range of the blades.

Preferably, the two end points of the rotation range of the paddle correspond to the paddle being parallel and perpendicular to the output shaft of the motor, respectively.

Preferably, the paddle is fixedly connected with the paddle shaft, and the paddle shaft is rotatably connected with the connecting sleeve; the paddle limiting device comprises limiting pieces fixedly connected to the paddle shaft and baffle plates fixedly mounted on the connecting sleeve, wherein the number of the baffle plates is two, and the limiting pieces are limited between the two baffle plates.

Preferably, the blade limiting device comprises two limiting pieces, and the two limiting pieces are respectively and fixedly installed on the blade shafts on two sides of the blade.

Preferably, the blade shaft is in threaded connection with the connecting sleeve.

Preferably, the motor base is provided with a lightening hole.

Preferably, a first gasket is fixedly mounted on the motor and is in threaded connection with the motor base.

Preferably, the output shaft of the motor is connected with a shaft sleeve through a key, and the connecting sleeve is fixedly arranged on the shaft sleeve.

In a second aspect, the invention further provides an unmanned aerial vehicle, which comprises a fuselage and wings connected to the fuselage, wherein the fuselage and/or the wings are provided with the anti-drag propellers; when the blades in the drag reduction propeller are parallel to the output shaft of the motor, the tips of the blades face the rear part of the fuselage.

Preferably, a second gasket is fixedly mounted on the motor base, and the second gasket is in threaded connection with the fuselage and/or the wing.

Adopt above-mentioned technical scheme, because the adapter sleeve, for the rotatable paddle axle of adapter sleeve and be used for restricting paddle turned angle's paddle stop device's setting, make the motor rotate the back, the paddle takes place to rotate for the adapter sleeve through the paddle axle under centrifugal action, thereby make the paddle expand the state of perpendicular to motor output shaft, thereby produce thrust through rotatory, and after the motor stall rotates, under the effect of air resistance or external force, the paddle takes place to rotate for the adapter sleeve through the paddle axle once more, thereby make the paddle shrink to the state of packing up that is on a parallel with the motor output shaft, thereby reduce air resistance and be convenient for transportation and save.

Drawings

FIG. 1 is a schematic view of a drag reducing propeller of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a schematic structural diagram of an unmanned aerial vehicle according to the present invention.

In the figure, 1-paddle, 2-paddle shaft, 3-output shaft of motor, 4-shaft sleeve, 5-spacing piece, 6-baffle piece, 7-connecting sleeve, 8-motor, 9-motor base, 10-second washer, 11-fuselage, 12-lightening hole, 13-first washer and 14-wing.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on structures shown in the drawings, and are only used for convenience in describing the present invention, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the technical scheme, the terms "first" and "second" are only used for referring to the same or similar structures or corresponding structures with similar functions, and are not used for ranking the importance of the structures, or comparing the sizes or other meanings.

In addition, unless expressly stated or limited otherwise, the terms "mounted" and "connected" are to be construed broadly, e.g., the connection may be a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two structures can be directly connected or indirectly connected through an intermediate medium, and the two structures can be communicated with each other. To those skilled in the art, the specific meanings of the above terms in the present invention can be understood in light of the present general concepts, in connection with the specific context of the scheme.

Example one

A drag reduction propeller is shown in figures 1 and 2 and comprises a motor base 9, a motor 8, a connecting sleeve 7, blades 1 and blade limiting devices.

Wherein, motor 8 fixed mounting is on motor cabinet 9, for example, has first packing ring 13 through the fixed understanding of welded mode on motor 8's the casing, is provided with the external screw thread on the circumference outer wall of first packing ring 13, and is corresponding be provided with on motor cabinet 9 with the internal thread hole of this external screw thread looks adaptation to make motor 8 through 13 threaded connection of first packing ring on motor cabinet 9, in order to make things convenient for dismantlement and maintenance motor 8.

Wherein, the connecting sleeve 7 is fixedly connected on the output shaft 3 of the motor 8. For example, the output shaft 3 of the motor 8 is connected with the shaft sleeve 4 through a key, and the connecting sleeve 7 is fixedly arranged on the shaft sleeve 4 through welding.

Wherein, the paddle 1 is rotatably connected on the connecting sleeve 7 through the paddle shaft 2, and the paddle shaft 2 is vertical to the output shaft 3 of the motor 8. For example, the root of paddle 1 seted up with the shaft hole of 2 looks adaptations of paddle shaft, paddle shaft 2 wear to establish in this shaft hole after fixed can through the key, and two tip of paddle shaft 2 all bulge in the shaft hole to in with adapter sleeve 7 rotatable coupling. For example, two opposite lugs are arranged on the outer wall of the connecting sleeve 7, shaft holes which are coaxially arranged are also formed in the two opposite lugs, and two ends of the blade shaft 2 are respectively installed in the shaft holes on the two lugs; or, the shaft holes on the lugs are replaced by threaded holes, and threads are correspondingly arranged at two ends of the paddle shaft 2, so that the paddle shaft 2 is screwed on the connecting sleeve 7 in a threaded mode, and the axial movement of the paddle shaft 2 is related to the circumferential rotation of the paddle shaft, so that the paddle shaft 2 can be effectively prevented from axially moving in the using process.

It is understood that there are at least two blades 1, and at least two blades 1 are circumferentially uniformly arranged around the axis of the output shaft 3 of the motor 8, that is, the blade shafts 2 are configured with at least two blades, and the blade shafts 2 are uniformly distributed on the same circumference around the axis of the output shaft 3 of the motor 8 while ensuring that the blade shafts 2 are perpendicular to the output shaft 3 of the motor 8.

Wherein, all be connected with paddle stop device between every paddle 1 and the adapter sleeve 7, paddle stop device is used for restricting the rotation range of paddle 1, also can understand, paddle stop device is used for restricting the contained angle between paddle 1 and the output shaft 3 of motor 8, for example in this embodiment, set up the contained angle between paddle 1 and the output shaft 3 of motor 8 to be 0-90, paddle 1 can rotate around the axis of paddle axle 2 in this angle range.

On the basis of the fixed connection between the blade 1 and the blade shaft 2, namely on the basis of the rotatable connection between the blade shaft 2 and the connecting sleeve 7, the blade limiting device is specifically provided with a limiting sheet 5 and two baffle sheets 6, wherein the limiting sheet 5 is fixedly connected to the blade shaft 2 in a welding or screw connection mode, the baffle sheets 6 are fixedly connected to the connecting sleeve 7 in a welding or screw connection mode, two baffle sheets 6 are configured, the two baffle sheets 6 are arranged at intervals of 90 degrees in the circumferential direction by taking the blade shaft 2 as the center, and the limiting sheet 5 is always limited within the range of 90 degrees between the two baffle sheets 6 in the process of rotating along with the blade shaft 2. The baffle plates 6 are arranged so that when the limiting plates 5 are respectively in contact with the two baffle plates 6 (i.e. two pole positions of the blade 1), the blade 1 is respectively parallel and perpendicular to the output shaft 3 of the motor 8, and when the blade 1 is parallel to the output shaft 3 of the motor 8, the tip of the blade 1 and the tail end of the output shaft 3 of the motor 8 point to the same direction. In another preferred embodiment, the blade limiting device comprises two limiting pieces 5, and the two limiting pieces 5 are respectively and fixedly mounted on the blade shaft 2 at two sides of the blade 1, so that the blocking effect of the baffle plate 6 can be improved, and the position of the blade 1 can be limited, thereby preventing the blade 1 from moving axially in the using process.

In another preferred embodiment, the motor base 9 is provided with lightening holes 12, for example, the lightening holes 12 are provided on the left, right, upper and lower four sides of the circumferential side wall of the motor base 9.

When the airplane is used, the motor base 9 is fixed on an airplane, the tail end of the output shaft 3 of the motor 8 faces one side of the rear part of the airplane, after the motor 8 is started, the paddle 1 is in an open state under the action of centrifugal force, namely, an included angle between the paddle 1 and the output shaft 3 of the motor 8 is 90 degrees, and under the action of the limiting piece 5 and one of the baffle pieces 6, the paddle 1 keeps the state and rotates, so that thrust is generated, and the airplane can move forward; and when the aircraft is in the state of sliding or when needing to transport and preserve, motor 8 stops work, under air resistance or external force effect, paddle 1 can rotate to the position that is on a parallel with output shaft 3 of motor 8 to reduce sliding resistance and whole volume size and convenient transportation and save.

Example two

An unmanned aerial vehicle comprises a fuselage 11 and wings 14 connected to the fuselage 11, wherein the fuselage 11 and/or the wings 14 are provided with drag reduction propellers disclosed in the first embodiment. And, when the blade 1 in the drag reduction propeller is parallel to the output shaft 3 of the motor 8, the tip of the blade 1 is directed toward the rear of the fuselage 11, that is, when the blade 1 is parallel to the output shaft 3 of the motor 8, the tip of the blade 1 and the tip of the output shaft 3 of the motor 8 point in the same direction.

As shown in fig. 3, the above-mentioned drag reduction propeller is fixedly mounted on the back (upper part) of the fuselage 11, and the end of the output shaft 3 of the motor 8 faces the rear part of the fuselage 11, it is understood that the output shaft 3 of the motor 8 may be parallel to the fuselage 11, or may have an angle with the fuselage 11, and the angle is suitable for the thrust generated by the blades 1 to have a horizontal component capable of driving the drone to move forward, such as 30 ° or 45 °.

In this embodiment, there is second packing ring 10 through welded mode fixed mounting on motor cabinet 9, and the outer wall of second packing ring 10 is provided with the external screw thread, is provided with the internal thread hole that uses with this external screw thread cooperation on the fuselage 11 to motor cabinet 9 can dismantle the connection on fuselage 11 through the mode of screw thread, thereby conveniently dismantles and maintains the drag reduction screw.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.