Variable-pitch propeller used for high-altitude unmanned plane and unmanned plane

Abstract

The invention provides a variable-pitch propeller used for a high-altitude unmanned plane and an unmanned plane. The variable-pitch propeller used for a high-altitude unmanned plane comprises a hub, a rotating shaft fixed on the hub and a blade which sleeves the rotating shaft and has a continuous surface. The blade contains a movable blade which can rotate around the rotating shaft under pressure difference of a leading edge and a trailing edge of the movable blade. A reset structure is arranged between the movable blade and the rotating shaft. The reset structure is used for resetting the rotating movable blade. The high-altitude unmanned plane comprises a fuselage and the above variable-pitch propeller, wherein the hub of the variable-pitch propeller is fixed on the fuselage. According to the invention, the blade which sleeves the rotating shaft fixed on the hub and has a continuous variable-pitch propeller surface is arranged to be a movable blade which can rotate around the rotating shaft under the pressure difference of the leading edge and the trailing edge of the blade itself, and the movable blade resetting structure is disposed between the movable blade and the rotating shaft. Thus, the variable-pitch structure of the propeller is simplified and meets propeller requirements of a high-altitude long-flight unmanned plane.

Description

technical field [0001] The invention relates to a variable-pitch propeller for high-altitude unmanned aerial vehicles and the unmanned aerial vehicle, belonging to the field of aviation technology. Background technique [0002] The cruising altitude of the high-altitude and long-endurance UAV is 20 kilometers, and the cruising time is more than 24 hours. In this high-altitude environment, the atmospheric density is low (about 1 / 14 of the air density on the ground), so the propeller of the UAV is required to have It is characterized by light weight and high aerodynamic efficiency in the cruising phase. Moreover, due to the long climbing time of high-altitude UAVs (it takes about 115 minutes for the U.S. "Global Hawk" UAV to climb to 19 kilometers), the pulling force required during the climbing process is relatively large (generally 3-4 times that of cruising). , it is necessary to increase the speed of the propeller at this time. However, the increase of the propeller rota...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a variable-pitch propeller for high-altitude unmanned aerial vehicles and unmanned aerial vehicles, to solve the problem that the variable-pitch propeller mechanism in the prior art is not suitable for high-altitude unmanned aerial vehicles

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