Two-stage ducted marine propeller

Abstract

The invention provides a propeller for a two-stage duct type boat and relates to a propeller for a boat. The propeller for the two-stage duct type boat is mainly composed of an inner boat shaft, an outer boat shaft, a propeller part I, a propeller part II, a propeller part III, double-headed stud parts and sealing plugs. When the propeller for the two-stage ducted boat is operated, the outer boat shaft drives the propeller part I and the propeller part II to rotate in the rotation direction of the outer boat shaft, the inner boat shaft drives the propeller part III to rotate in the rotation direction of the inner boat shaft, and thus the function of conveying water flow by a two-stage liquid pump is fulfilled. The water flow is ejected through the rear end of a duct II and pushes the boat to advance. Tips of blades of the propeller for the two-stage duct type boat are connected with the inner surfaces of the ducts, thus high structural strength and rigidity of the propeller for the two-stage duct type boat are guaranteed, and a composite material represented by carbon fiber reinforced plastic is suitable for the propeller.

Description

Technical field [0001] The invention relates to a two-stage ducted marine propeller, which relates to a marine propeller, in particular to a two-stage ducted marine propeller. Background technique [0002] There are many types of marine propellers. Common civil ship propellers mainly include ordinary propellers, ducted propellers (also called draft tube propellers, referred to as ducted propellers), and controllable pitch propellers. [0003] An ordinary propeller is composed of blades and a hub. The connecting part of the propeller and the ship shaft is called the propeller hub, which is a truncated cone. In order to reduce the water resistance of the propeller, a hub cap is installed at the rear end of the propeller hub, which forms a streamline with the propeller hub. Ordinary propellers are usually three-blade or four-blade, and the blades are fixed on the hub. The side of the propeller blade seen when looking forward from behind the stern is called the blade surface, and th...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of traditional civil ship propellers that are prone to cavitation, uneven force, low work efficiency, and unsuitable for composite materials, and provide a demand that is suitable for large and medium-sized civil ships, which is not easy to produce cavitation, Two-stage ducted marine propeller with uniform force and high working efficiency, suitable for composite materials

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