Unmanned aerial vehicle comprising safety guard

Patent metadata

Field	Value
Publication number	US-2021237861-A1
Application number	US-201917049920-A
Country	US
Kind code	A1
Filing date	Apr 16, 2019
Priority date	Apr 23, 2018
Publication date	Aug 5, 2021
Grant date	—

Abstract

An unmanned aerial vehicle according to the present invention may comprise: a rotor-blade for providing thrust according to generation of main stream; and a safety guard disposed to surround the rotor-blade. The safety guard may comprise: a guide member which is disposed coaxially with the rotor-blade while having a gap between the guard member and the end of the rotor-blade, so as to stabilize, when the rotor-blade rotates, a flow field suctioned by a negative pressure, and stably boost a discharge flow when the pressure is changed to a positive pressure; and a diffuser which is disposed coaxially with and radially spaced apart from the guide member, and generates a secondary flow toward the main stream to increase a flow rate.

First claim

1 . An unmanned aerial vehicle comprising:
a rotor blade for providing thrust according to generation of a main stream; and a safety guard disposed to surround the rotor blade, wherein the safety guard comprises: a guide member, which is disposed coaxially with the rotor blade so as to have a gap with respect to an end of the rotor blade, the guide member being configured to stabilize, when the rotor blade rotates, a flow field suctioned by a negative pressure, and to stably push an ejection flow when switching to a positive pressure; and a diffuser, which is disposed coaxially with and radially spaced apart from the guide member, the diffuser being configured to generate a secondary flow toward a main stream to increase a flow rate.

2 . The unmanned aerial vehicle of claim 1 , wherein the guide member comprises a bell mouth.

3 . The unmanned aerial vehicle of claim 2 , wherein, when viewed from above the rotor blade vertically, the guide member is disposed parallel to the rotor blade without overlapping the rotor blade, and is disposed in a top end region parallel to the diffuser without overlapping the diffuser.

4 . The unmanned aerial vehicle of claim 1 , wherein the rotor blade is dually surrounded by the guide member and the diffuser in a radial direction.

5 . The unmanned aerial vehicle of claim 1 , wherein the diffuser is disposed to be spaced apart from the guide member in a radial direction.

6 . The unmanned aerial vehicle of claim 1 , wherein the rotor blade is disposed to be accommodated in the guide member.

7 . The unmanned aerial vehicle of claim 1 , wherein at least a portion of the guide member is accommodated in the diffuser, and a remaining portion is disposed to protrude from a top end of the diffuser.

8 . The unmanned aerial vehicle of claim 1 , wherein the diffuser has a ring shape at a top end thereof, and a morning glory petal shape at a bottom end thereof, and includes a convex portion and a concave portion which are gradually increase in size from the top end to the lower end.

9 . The unmanned aerial vehicle of claim 1 , wherein the diffuser comprises multiple concave portion and convex portions that are symmetrically arranged at a bottom end, and the secondary fluid is mixed toward the main stream by the plurality of concave portions.

10 . The unmanned aerial vehicle of claim 9 , wherein the number of multiple concave portion is eight.

11 . The unmanned aerial vehicle of claim 9 , wherein the diffuser is configured to generate the secondary flow by each of the concave portion so as to mix the secondary flow to the main stream.

12 . The unmanned aerial vehicle of claim 1 , wherein when an inner diameter of a bottom end of the diffuser is defined as d1 and a diameter of the rotor blade is defined as d2, a ratio of d1/d2 is 60% to 70%.

13 . The unmanned aerial vehicle of claim 1 , wherein, when a diameter of the rotor blade is defined as d2 and a vertical width of the diffuser is defined as d3, a ratio of d3/d2 is 20% to 25%.

14 . The unmanned aerial vehicle of claim 1 , wherein the guide member is integrally connected to the diffuser by multiple connection members which are arranged at an equal interval.

15 . The unmanned aerial vehicle of claim 1 , wherein the guide has a ring shape in cross section.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kang Yonghun
• Park Junho
• Jung Seunghwan
• Yang Soosang
• Jung Sangjun

Classifications

• B64U30/30

  Lift-producing means using radial airflow · CPC title

• B64U30/299

  Rotor guards (ducted or shrouded rotors B64U30/26; guards used as ground propulsion B64U60/60) · CPC title

• B64U10/13

  Flying platforms · CPC title

• B64U30/26 Primary

  Ducted or shrouded rotors · CPC title

• B64C11/001

  Shrouded propellers · CPC title