A propeller that reduces stress at the blade root and reduces tip vortices

Abstract

The invention aims at providing a propeller for reducing stress at the positions of blade roots and decreasing tip vortexes. The propeller comprises a propeller hub, propeller blades and blade tip small blades. The propeller blades are installed on the propeller hub. Grooves are formed in the end portions of the blade tip small blades. Protrusions matched with the grooves are arranged at the end portions of the propeller blades. The blade tip small blades and the propeller blades are connected in an inlaid manner through the grooves and the protrusions and fixed through screws. The blade tip small blades are provided with transverse flow stop boards, and each transverse flow stop board and the corresponding blade tip small blade are of an integrated structure. By the adoption of the propeller, the centrifugal force generated in the rotation process of the propeller blades can be partially counteracted so that the thickness of each blade root can be reduced, the thrust generated at the positions of the blade roots can be larger, bubbles can be better reduced, and the performance can be optimized. In the rotation process of the propeller, liquid on the blade faces cannot flow to the blade backs, the tip vortexes are decreased, noise is lowered, and larger thrust can be provided through the blade tips.

Description

technical field [0001] The present invention relates to a ship propeller, specifically a propeller. Background technique [0002] Generally, a ship propulsion system includes a ship diesel engine, a shafting system and a propeller. The ship diesel engine generates power and transmits it to the propeller through the shaft system. When rotating, the water flows along both sides of the blade. Due to the asymmetry of the cutting surface of the blade, the speed of the water flowing on both sides is different. According to the Bernoulli equation, it can be known that the pressure difference on both sides of the blade generates thrust. [0003] In the prior art, the speed of the water flow on the blade surface of the propeller is different from that at the back of the blade, and the pressure generated by the water flow on the blade surface and the back of the blade is different, so there will be a pressure difference. Because of this, the propeller generates thrust to work on the s...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the speed of the water flow on the blade surface of the propeller is different from that at the back of the blade, and the pressure generated by the water flow on the blade surface and the back of the blade is different, so there will be a pressure difference. Because of this, the propeller generates thrust to work on the ship, but Since there is no baffle at the tip of the propeller, the water at the tip of the blade will flow from the blade surface to the back of the blade under the action of the pressure difference, and the pressure generated by the blade cannot be fully exerted, reducing the efficiency of the propeller. Propeller noise will increase

[0004] In the prior art, due to the high speed of the propeller in water, the propeller blades will generate a large centrifugal force, which requires a high strength of the propeller blade root, which requires the blade root to be made very thick, which will make the The cavitation performance of the propeller deteriorates, which also reduces the thrust generated at the blade root and reduces the efficiency of the propeller

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