Controllable pitch propeller for ship

Abstract

A controllable pitch propeller for a ship is provided with an elastic blade root and comprises a propeller hub and a plurality of blades, wherein a connecting piece fixed at the lower end of each blade is inserted into a mounting hole of the propeller hub can be rotated, a securing ring is fixed at the bottom of the mounting hole of the propeller hub, a clearance is reserved between the securing ring and the connecting piece, and two ends of the elastic blade root are respectively inserted into the connecting piece and the securing ring and fixedly connected with the connecting piece and the securing ring. When the power of a main engine is increased or the flow coming speed of the propeller is reduced, the load of the propeller is increased, the pushing force is also increased, the blades are finely adjusted to rotate, the elastic blade root is twisted and deformed, and a pitch angle is changed, and a pitch is reduced. Therefore, the load is reduced. When the load of the propeller is reduced, the elastic blade root enables the pitch angle to recover according to the elastic force. The propeller can adjust the pitch to adapt to the working conditions of the ship, and can enable the blades to carry out adaptive adjustments according to different flow speeds under different angles of rotation, and the load is enabled to be more uniform during a circle of movement.

Description

technical field [0001] The invention relates to a marine propeller, especially a variable-pitch marine propeller. Background technique [0002] The pitch in the present invention refers to the surface pitch of the propeller: the paddle surface of the propeller is the rotating surface. The intersection line between any cylindrical surface coaxial with the propeller and the blade surface is a section of the helix line, and the cylindrical surface intercepts the blade to obtain the tangent surface of the blade, that is, the tangent surface of the blade is on the helical line where the cylindrical surface and the blade surface intersect , the axial distance between the two ends of the blade is equal to the pitch of the helix. (See pages 10-11 of the 1985 edition of Ship Propulsion). [0003] There are great changes in the operating conditions of the ship, for example, the full load condition or the ballast condition represent the maximum carrying capacity or the lightest carry...

AI Technical Summary

Problems solved by technology

Clearly, the systems required to control hydraulic pitch props are complex and expensive

Due to its high price, it is currently only used on luxury cruise ships or special ships with high mobility requirements, and it is difficult to apply to major transport ships such as bulk carriers, container ships, and oil tankers

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