Variable ducted propeller

Abstract

A variable ducted propeller comprises a propeller and a duct which sleeves the periphery of the propeller, wherein the duct comprises a fixed tube section and a movable tube section, which are connected with each other in series in an axial direction of the propeller; the fixed tube section is positioned at the front end of the duct; the movable pipe section is formed by connecting a plurality of blades with wing-shaped sections in series in a circumferential direction; the blades are rotatably connected with the end surface of the fixed tube section; a hydraulic control lever is hinged on the outer wall surface of each blade; push levers of the hydraulic control levers are hinged with the blades; push lever seats of the hydraulic control levers are hinged with the outer wall surface of the fixed tube section; and the axial directions of the hydraulic control levers are parallel to a bus of the duct. According to the invention, high propelling efficiency under two different working conditions of low advance operation and high speed voyage can be ensured.

Description

technical field [0001] The invention relates to the technical field of underwater propulsion devices, in particular to a ducted propeller, in particular to a ducted propeller with an adjustable duct outlet expansion angle. Background technique [0002] The underwater propulsion device is used to propel ships, boats, submersibles, deep-sea mobile workstations, offshore work platforms and other surface / submerged objects for navigational movement and attitude adjustment. The ducted propeller is a widely used underwater propulsion device. It refers to adding a guide tube around the propeller, that is, a circular sleeve is installed around the ordinary propeller. The sleeve can be fixed or rotated as a whole. Compared with ordinary propellers, due to the diversion effect of the duct, the propulsion force can be improved. As one of the key components of the ducted propeller, the duct directly affects the efficiency of the ducted propeller. In general, a catheter with higher effi...

AI Technical Summary

Problems solved by technology

In general, a catheter with higher efficiency can be found through optimization design, but it is found during the optimization process that since the expansion angle of the existing catheter is fixed, the expansion angle is the lower surface of the catheter airfoil (that is, the inner surface ) and the conduit axis, the ratio of the inlet and outlet areas of the conduit is also fixed, when the expansion angle is small, the propulsion efficiency is low under low advance speed conditions, and when the expansion angle is large, the The propulsion efficiency decreases, and an expansion angle that meets the intermediate requirements can be found through optimized design, but the optimized design of conventional ducts cannot simultaneously work with better or even optimal propulsion efficiency under the two different working conditions of low advance speed and normal navigation

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