A foldable propeller capable of withstanding high-speed airflow

Abstract

A folding propeller capable of withstanding high-speed airflow comprises: a power motor, a hub, an adapter bracket, a limiter, a reed, a centrifugal lock, a locking shaft, a propeller shaft, a propeller root, a blade, a steel ball, a coil spring, a top screw, and a fairing. When the drone is at high speed and the propeller power system is not working, the propeller is ensured to be in a folded state, so that the drone has a smoother appearance. Under the action of high-speed airflow, the propeller blades in the folded state will not open; in addition, when the propeller power system starts working, the blades can be smoothly opened and put into a working state only by rotating the propeller power motor. The present invention solves the problem of folding, storing and unfolding the blades of the drone propeller power system. The folded state can withstand high-speed airflow and can be converted to the unfolded state, and the unfolded state can work normally.

Description

Technical Field

[0001] The invention relates to a folding propeller capable of withstanding high-speed airflow, and belongs to the field of unmanned aerial vehicle power systems. Background Art

[0002] Modern drones are developing towards miniaturization. The folding structure is suitable for small space storage. After being released, the structure can be quickly unfolded and quickly enter the flight state. This is an important design idea for drones. At present, the folding of drone propellers is mainly to meet the needs of reducing storage space. After folding, the shape of the propeller power system is not smooth and cannot withstand high-speed airflow. Therefore, drones cannot fly at high speed (speed greater than 80m / s) with high aerodynamic performance (low resistance, low interference) in the folded state. Summary of the invention

[0003] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art, and to propose a folding propeller that can withstand high-speed airflow. When the drone is at high speed and the propeller power system is not working, the propeller is guaranteed to be in a folded state, so that the drone has a smoother appearance. Under the action of high-speed airflow, the propeller blades in the folded state will not open; in addition, when the propeller power system starts working, the blades can be smoothly opened only by the rotation of the propeller power motor, and are in a working state. The present invention solves the problem of folding, storing and unfolding the blades of the propeller power system of the drone. The folded state can withstand high-speed airflow and can be converted to the unfolded state, and the unfolded state can work normally.

[0004] The technical solution of the present invention is:

[0005] A folding propeller capable of withstanding high-speed airflow, comprising: a power motor, a propeller hub, an adapter bracket, a limiter, a reed, a centrifugal force lock, a locking shaft, a propeller root shaft, a propeller root, a propeller blade, a steel ball, a spiral spring, a top screw, and a fairing;

[0006] A plurality of blades and propeller roots are connected to the propeller hub via a propeller root shaft; the blades and propeller roots can rotate around the corresponding propeller root shaft; and a plurality of blades and propeller roots are evenly distributed circumferentially on the propeller hub;

[0007] The power motor is used to drive the propeller hub to rotate;

[0008] The fairing is fixedly connected to the propeller hub, and grooves matching the number and shape of the propeller blades are processed on the fairing;

[0009] A plurality of centrifugal locks are fixedly connected to the propeller hub via a lock shaft, and the centrifugal locks can rotate around the lock shaft;

[0010] A plurality of limiters are fixedly connected to the propeller hub, and a spring is fixedly connected to each limiter;

[0011] A locking groove corresponding to the centrifugal force lock protrusion is machined on the propeller root;

[0012] The limiter, the reed and the centrifugal lock cooperate to lock the blade and the root of the propeller in a folded state;

[0013] The centrifugal lock can rotate around the lock shaft under the action of centrifugal force, and the centrifugal lock pushes the spring to bend and deform, so that the blade and the root of the blade are unlocked from the folded state;

[0014] There are multiple through holes on the propeller hub corresponding to the propeller root, and the steel balls are fixed in the through holes through coil springs and top screws; the locking groove on the propeller root cooperates with the steel balls to lock the blades and the propeller root in the expanded state after they are rotated into place.

[0015] The propeller hub is connected to the power motor through an adapter bracket; or the propeller hub is directly connected to the power motor.

[0016] When folded, the blades are stored in grooves in the fairing, creating a smooth appearance.

[0017] The locking groove of the blade root includes: an auxiliary locking groove and a folding locking groove;

[0018] The auxiliary locking groove and the folding locking groove are distributed around the propeller root axis, and the relative distribution angle is equal to the angle of the propeller from folding to unfolding.

[0019] The locking groove depth is greater than 0.9 times the radius of the steel ball.

[0020] The centrifugal lock is pressed by the spring to prevent the centrifugal lock from being out of the locked state due to vibration or airflow.

[0021] The beneficial effects of the present invention compared with the prior art are:

[0022] In the folded state, the blades of the present invention form a relatively smooth shape with the fairing, and a locking mechanism is provided to lock the blades in a folded state and close to the fairing, so that the blades can withstand the impact of airflow at a relatively high speed. In addition, in the folded state, the present invention has a relatively smooth shape, so the aerodynamic resistance generated by the system is relatively small, and the aerodynamic interference force generated is relatively small, which is conducive to the high-speed flight of the UAV in the folded state. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a schematic diagram of the installation of the foldable propeller of the present invention on a UAV in a folded state.

[0024] Figure 2 The figure is a schematic diagram of the installation of the foldable propeller of the present invention on a UAV in an unfolded state.

[0025] Figure 3 This is a schematic diagram of the foldable propeller of the present invention in a folded state as an independent component.

[0026] Figure 4 This is a cross-sectional view of the foldable propeller of the present invention in an unfolded state.

[0027] Figure 5 This is a cross-sectional view of the foldable propeller of the present invention in a folded state.

[0028] Figure 6 It is a partial cross-sectional view of the propeller root locking mechanism of the foldable propeller of the present invention in the folded state.

[0029] Figure 7 It is a partial cross-sectional view of the foldable propeller of the present invention in a state where the foldable propeller is folded but the centrifugal lock is unlocked.

[0030] Figure 8 The figure is a cross-sectional view of the propeller blades and the fairing of the foldable propeller of the present invention in the folded state.

[0031] Fig. 9 It is a schematic diagram of the folding propeller blades and propeller root of the present invention.

[0032] Fig.10 It is a schematic diagram of the centrifugal lock of the folding propeller of the present invention. DETAILED DESCRIPTION

[0033] like Figure 1 , 2 The present invention is a folding propeller that can withstand high-speed airflow. Its main function is to ensure that the propeller is in a folded state when the drone is flying at high speed and the propeller power system is not working, so that the drone has a smoother appearance. Under the action of high-speed airflow, the propeller blades in the folded state will not open; in addition, when the propeller power system starts working, the blades can be smoothly opened only by the rotation of the propeller power motor, and are in a working state. The present invention solves the problem of folding, storing and unfolding the blades of the propeller power system of the drone. The folded state can withstand high-speed airflow and can be converted to the unfolded state, and the unfolded state can work normally.

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The present invention provides a folding propeller capable of withstanding high-speed airflow. Figure 5 , 6 As shown, it includes: a power motor 1, a propeller hub 2, an adapter bracket 3, a stopper 4, a spring 5, a centrifugal lock 6, a lock shaft 7, a propeller root shaft 8, a propeller root 9, a propeller blade 10, a steel ball 11, a spiral spring 12, a top screw 13, and a fairing 14. A plurality of propeller blades 10 and a propeller root 9 are connected to the propeller hub 2 through the propeller root shaft 8; the propeller blades 10 and the propeller root 9 can rotate around the corresponding propeller root shaft 8; and a plurality of propeller blades 10 and a propeller root 9 are evenly distributed circumferentially on the propeller hub 2. The power motor 1 is used to drive the propeller hub 2 to rotate.

[0036] The fairing 14 is fixedly connected to the hub 2, and grooves matching the number and shape of the blades 10 are processed on the fairing 14. Figure 8 A plurality of centrifugal locks 6 are fixedly connected to the hub 2 via a lock shaft 7 , and the centrifugal locks 6 can rotate around the lock shaft 7 .

[0037] A plurality of stoppers 4 are fixedly connected to the hub 2, and a reed 5 is fixedly connected to each stopper 4. A locking groove corresponding to the protruding portion of the centrifugal lock 6 is processed on the blade root 9. The stoppers 4, the reed 5 and the centrifugal lock 6 cooperate to lock the blade 10 and the blade root 9 in a folded state. The centrifugal lock 6 can rotate around the lock shaft 7 under the action of centrifugal force, and the centrifugal lock 6 pushes the reed 5 to bend and deform, so that the blade 10 and the blade root 9 are unlocked from the folded state. Figure 7 shown.

[0038] A plurality of through holes are processed on the hub 2 at positions corresponding to the blade root 9, and the steel ball 11 is fixed in the through hole by a coil spring 12 and a top screw 13; the locking groove on the blade root 9 cooperates with the steel ball 11, so that the blade 10 and the blade root 9 are locked in the unfolded state after being rotated into place.

[0039] The propeller hub 2 is connected to the power motor 1 through the adapter bracket 3; or the propeller hub 2 is directly connected to the power motor 1.

[0040] In the folded state, the blades 10 are stored in the grooves of the fairing 14, forming a smooth appearance.

[0041] The locking groove of the blade root 9 includes: an auxiliary locking groove 902 and a folding locking groove 901;

[0042] The auxiliary locking groove 902 and the folding locking groove 901 are distributed around the propeller root axis 8, and the relative distribution angle is equal to the angle of the propeller from folding to unfolding.

[0043] The depth of the locking groove 901 is greater than 0.9 times the radius of the steel ball 11 .

[0044] The centrifugal lock 6 is pressed by the spring leaf 5 to prevent the centrifugal lock 6 from being out of the locked state due to vibration or airflow.

[0045] Example

[0046] A folding propeller capable of withstanding high-speed airflow comprises: a power motor 1, a propeller hub 2, an adapter bracket 3, a limiter 4, a reed 5, a centrifugal force lock 6, a lock shaft 7, a propeller root shaft 8, a propeller root 9, a propeller blade 10, a steel ball 11, a spiral spring 12, a top screw 13, and a fairing 14.

[0047] The power motor 1 is a power source for driving the propeller to rotate and generate thrust, and in the present invention, is also a power source for unfolding the propeller blades.

[0048] The hub 2 is an important basic structure of the folding propeller. Most parts are installed on the hub 2. The hub 2 is connected to the power motor 1 through the adapter bracket 3, and can also be directly connected to the power motor 1.

[0049] The blade 10 is folded and stored in the groove of the fairing 14 to form a smooth shape. The blade root 9 is locked by the centrifugal lock 6, and the centrifugal lock 6 is pressed by the spring 5 to prevent the centrifugal lock 6 from being out of the locked state due to vibration and airflow.

[0050] When ready to be deployed, the power motor 1 rotates, the centrifugal lock 6 rotates around the lock shaft 7 under the action of centrifugal force, pushing the spring 5 to bend and deform, the centrifugal lock 6 is out of the locked state, the blade 10 and the blade root 9 rotate around the blade root shaft 8 under the action of centrifugal force, and rotate to the deployed state, the steel ball 11 falls into the pit on the blade root, and the blade 10 and the blade root 9 are locked in the deployed state. Figure 4 shown.

[0051] 1) A propeller root 9 having a centrifugal lock 6 and being lockable by the centrifugal lock 6 in a folded state.

[0052] 2) The blade root 9 and the blade 10 may be integrally manufactured components without a clear interface. When they are integral components, the blade root 9 or the blade 10 described in the present invention are regarded as the same component. Fig. 9 shown.

[0053] 3) The propeller root 9 has a folding locking groove 901 .

[0054] 4) The blade root 9 has a folding auxiliary locking groove 902 .

[0055] 5) The auxiliary locking groove 902 and the folding locking groove 901 are distributed around the propeller root rotation axis hole 903, and the relative distribution angle is equal to the angle of the propeller from folding to unfolding.

[0056] 6) The depth of the locking groove 901 is greater than 0.9 times the radius of the steel ball 11 .

[0057] 7) The centrifugal lock 6 has a mass block 601 that generates centrifugal force when the propeller rotates in the folded state. The centrifugal force generated by the mass block 601 causes the centrifugal lock 6 to rotate around its rotation axis hole 603.

[0058] 8) If Fig.10 As shown, the centrifugal lock 6 has a locking surface 602 for locking the blade root. In the locked state, the locking surface 602 is in contact with the blade root groove 901.

[0059] 9) The mass block 601 and the locking surface 602 are axially distributed around the rotation axis 603, and the distribution angles differ by 50° to 180°.

[0060] 10) The fairing 14 has grooves 1402 having the same number as the blades 10, for storing the blades 10 in a folded state.

[0061] 11) When the fairing 14 makes any transverse fairing cross section 1401, the cross section 1001 of the corresponding blade 10 fits with the fairing cross section 1401, and the maximum gap of the fitting part is less than 1 mm.

[0062] Principle description:

[0063] like Figure 3 As shown, in the folded locked state: the blade 10 is in the groove 1402 of the fairing 14, the steel ball 11, under the action of the coil spring 12, presses against the auxiliary locking groove 902 to provide a secondary locking force, and the centrifugal lock 6, under the action of the spring 5, has its locking surface 602 and the locking groove 901 fitted to provide the main locking force. In the locked state, it can withstand the airflow of 0 to 100 m / s at sea level vertical to the propeller rotation axis (the conversion method is that the airflow velocity component perpendicular to the axis is taken when the airflow pressure is equal), and the blade 10 will not be separated from the fairing 14 or even unfolded.

[0064] Unlock and deploy: When the power motor 1 rotates to a certain speed, the centrifugal lock 6 rotates around the lock shaft 7 under the action of centrifugal force. When the centrifugal force is large enough, the centrifugal lock 6 pushes the spring 5 to bend and deform, and the centrifugal lock 6 is out of the locked state. The blade 10 and the blade root 9 rotate around the blade root shaft 8 under the action of centrifugal force, and the steel ball 11 is out of the auxiliary locking groove 902. The blade 10 and the blade root 9 rotate until they are deployed, and the steel ball 11 falls into the locking groove 901 on the blade root, and the blade 10 and the blade root 9 are locked in the deployed state.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A folding propeller capable of withstanding high-speed airflow, characterized in that: include: A power motor (1), a propeller hub (2), an adapter bracket (3), a stopper (4), a spring leaf (5), a centrifugal lock (6), a locking shaft (7), a propeller shaft (8), a propeller root (9), a propeller blade (10), a steel ball (11), a spiral spring (12), a top screw (13), and a fairing (14); A plurality of blades (10) and a blade root (9) are connected to a hub (2) via a blade root shaft (8); the blades (10) and the blade root (9) are capable of rotating around the corresponding blade root shaft (8); and a plurality of blades (10) and the blade root (9) are evenly distributed circumferentially on the hub (2); The power motor (1) is used to drive the propeller hub (2) to rotate; The fairing (14) is fixedly connected to the hub (2), and grooves having the same number and shape as the blades (10) are processed on the fairing (14); A plurality of centrifugal locks (6) are fixedly connected to the propeller hub (2) via a lock shaft (7), and the centrifugal locks (6) are capable of rotating around the lock shaft (7); A plurality of limiters (4) are fixedly connected to the propeller hub (2), and a spring leaf (5) is fixedly connected to each limiter (4); A locking groove corresponding to the protruding portion of the centrifugal lock (6) is processed on the blade root (9); The stopper (4), the reed (5) and the centrifugal lock (6) cooperate to lock the blade (10) and the blade root (9) in a folded state; The centrifugal lock (6) can rotate around the lock shaft (7) under the action of centrifugal force, and the centrifugal lock (6) pushes the reed (5) to bend and deform, so that the blade (10) and the blade root (9) are unlocked from the folded state; A plurality of through holes are processed on the propeller hub (2) at positions corresponding to the propeller root (9), and a steel ball (11) is fixed in the through hole through a coil spring (12) and a top screw (13); a locking groove on the propeller root (9) cooperates with the steel ball (11), so that the propeller blade (10) and the propeller root (9) are locked in an unfolded state after being rotated into position.

2. A foldable propeller capable of withstanding high-speed airflow according to claim 1, characterized in that: The propeller hub (2) is connected to the power motor (1) via an adapter bracket (3); or the propeller hub (2) is directly connected to the power motor (1).

3. A foldable propeller capable of withstanding high-speed airflow according to claim 1, characterized in that: In the folded state, the blades (10) are stored in the grooves of the fairing (14), forming a smooth appearance.

4. A foldable propeller capable of withstanding high-speed airflow according to any one of claims 1 to 3, characterized in that: The locking groove of the blade root (9) comprises: an auxiliary locking groove (902) and a folding locking groove (901); The auxiliary locking groove (902) and the folding locking groove (901) are distributed around the propeller root axis (8), and the relative distribution angle is equal to the angle of the propeller from folding to unfolding.

5. A foldable propeller capable of withstanding high-speed airflow according to claim 4, characterized in that: The depth of the locking groove (901) is greater than 0.9 times the radius of the steel ball (11).

6. A foldable propeller capable of withstanding high-speed airflow according to claim 4, characterized in that: The centrifugal force lock (6) is pressed by the spring leaf (5) to prevent the centrifugal force lock (6) from being out of the locked state due to vibration or airflow.

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