A suspended structure paddle

Abstract

The invention provides a suspended structure oar, which includes four parts: an oar frame groove, an oar frame, paddle blades and a transmission gear. The paddle shaft on the paddle is inserted into the paddle shaft hole on the paddle frame, the paddle is connected with the paddle frame with a suspension structure, and the paddle can rotate around the shaft under the paddle frame. The paddle frame reciprocates in the paddle frame groove. The "hidden" oar frame slots prevent the oar frame from being impacted by the frontal water flow, thereby directly reducing the water resistance on the oar frame structure during propulsion. The present invention can be realized by means of single paddle, double paddle, multi-blade paddle group, etc., and has the advantages of high-efficiency propulsion, hull control, hydrodynamic noise reduction, cavitation effect reduction, and hull concealment.

Description

technical field [0001] The invention relates to a hull propulsion device, in particular to a suspended structure oar, which belongs to the technical field of oar structures. Background technique [0002] At the present stage, among the propulsion methods adopted by ships of various sizes, no matter which propulsion method has certain disadvantages. Take the propeller and the traditional wooden paddle propulsion method as an example: 1. The propeller has a non-negligible axial area. When the speed of the propeller is extremely high, its propulsion efficiency will decrease instead. The propellers are connected by shafting. During the rapid propulsion of the propeller, the hydrodynamic noise generated by the propeller is also very large. The propeller also has a cavitation effect, that is, when the propeller speed reaches a certain value, bubbles overflow on the water-absorbing surface of the blade. The higher the speed of the propeller, the more serious the cavitation effec...

AI Technical Summary

Problems solved by technology

The cavitation effect of the propeller will not only distort the water flow, make the blade idle and reduce the propulsion efficiency of the blade, but also may cause strong shock wave The emergence of and cause corrosion of the surface of the blade

For submarines, what is more serious is the generation of a large number of cavitation bubbles, causing the submarine to drag a trail and generate very large cavitation noise, which can easily reveal the position of the submarine.

2. Traditional wooden paddles do reciprocating motion. When reaching the limit position and returning to the opposite direction, the water will have the same resistance as the propulsion force, and the work done to overcome the restoring force is also very much, so wooden paddles can only be used for small boat

First of all, it is difficult to greatly improve the propulsion efficiency of the paddle. When the ship is propelled, the paddle consumes a lot of energy, but it cannot make the ship reach the expected speed.

In addition, the noise of the oars applied to the hull at this stage is relatively loud

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