Water-jet type marine engine

Abstract

The invention discloses a water-jet type marine engine. An annular water flow propeller is installed on the bottom or the two side faces of the bottom of a ship or a naval ship 1, and according to theannular water flow propeller, a left channel arm 8, a right channel arm 20, a front channel 7 and a rear channel 10 form an annular body. A T-shaped water-jet pipe 30 with the diameter equal to the diameter of the annular body is formed from the axial direction of the central part of the rear channel 10 to the direction opposite to the ship driving direction, after waterproof sealing is conductedon the water-jet pipe, the water-jet pipe is introduced to a ship tail portion 3, and a thrust jet hole 5 is equivalent to an air jet hole of a turbofan engine. By means of the water-jet type marineengine, the problems that an existing screw propeller for the ships is low in efficiency, high in noise and low in speed are solved.

Description

technical field [0001] The invention relates to an engine, in particular to a water jet marine engine. Background technique [0002] The propeller propeller is almost all the driving power sources of ships and ships and all water and underwater. The propeller is an important part necessary for the shipbuilding industry. The propeller directly affects the driving speed because the propeller provides the power for the ship to move forward. In order to enable the ship to maintain a certain speed on the water surface or in the water to overcome the resistance of the water, the propeller gives the ship a forward momentum. This forward momentum is the thrust generated by the angled rotation of the propeller relative to the water. In terms of fluid mechanics, ordinary ships and ships are equivalent to aircraft propellers. Aircraft propellers are replaced by turbofan engines because of their low efficiency and slow speed, while ships and ships still use propellers. [0003] Sh...

AI Technical Summary

Problems solved by technology

[0003] Ship propellers all adopt propeller type propulsion, which is the most primitive propulsion method. This method has low efficiency, high noise and complex manufacturing process, especially large propellers generally include hub, blade, blade root, follower, and blade tip. And the guide edge, the manufacture of super large propellers involves many difficulties such as casting technology (to prevent cavitation), machining technology, etc., especially for propellers with complex shapes and high precision requirements, high-end multi-axis linkage machine tools are used.

These insurmountable shortcomings have always plagued the propulsion speed and efficiency of ships, especially submarines. Noise is a fatal problem. In order to reduce noise, all methods have been tried, but the reduction has been minimal.

From a safety point of view, when a ship with a single propeller is turning sharply, due to the rotational torque of the propeller and the centrifugal force of the ship, it is easy to cause a ship rollover accident.

The efficiency of the propeller propeller is very low at driving speed, so the speed of the ship cannot reach the desired speed. The noise from the propeller propeller of the submarine makes the submarine unable to stealth, directly affecting the security of the country

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