Seawater Flow Control Mechanism for Uniform Propulsion Velocity

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Solution Overview

Problem

The velocity of a seawater intake propulsion system varies due to pressure differences caused by changes in velocity, affecting the combustion reaction and propulsion efficiency.

Innovation Solution

A seawater flow control device that adjusts the seawater flow rate through adjustable discharge holes using a piston and elastic member, coupled with a gear mechanism, to maintain a consistent propulsion velocity by controlling the seawater flow based on pressure changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the velocity of the propulsion system increases, then the pressure of seawater increases and power generation improves, but the velocity becomes unstable due to pressure differences

Engineering Contradiction:
Improvepower generationVSAvoidvelocity stability
Core Design Contradiction:
PowerVSStability of the object's composition

Solution Approach 1:

The patent applies dynamics by making the seawater discharge hole configuration adjustable rather than fixed. The piston mechanism allows the number of open discharge holes to dynamically change based on operating conditions, enabling the system to adapt to varying pressures and velocities to maintain stable operation

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of seawater flow rate by controlling the number of open discharge holes. When velocity and pressure increase, the system reduces seawater flow by closing holes; when velocity decreases, it increases flow by opening more holes, thereby stabilizing velocity through parameter adjustment

Inventive Principle:
Principle #35Parameter changes

2Device complexity

If the number of seawater discharge holes is fixed, then the device structure is simple, but the velocity control precision is poor

Engineering Contradiction:
Improvedevice structureVSAvoidvelocity control precision
Core Design Contradiction:
Device complexityVSManufacturing precision

Solution Approach 1:

The patent transforms the fixed discharge hole structure into a dynamic one where the number of open holes can change. The piston mechanism provides a relatively simple structural addition that enables precise control of seawater flow rate, achieving good velocity control precision without excessive device complexity

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent segments the discharge holes into multiple individual holes that can be opened or closed independently by the piston mechanism. This segmentation allows for fine-grained control of seawater flow rate, enabling precise velocity control while maintaining a manageable device structure

Inventive Principle:
Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The device stabilizes propulsion system velocity by increasing seawater flow at low pressure and reducing it at high pressure, ensuring a uniform motion and efficient power generation.

Implementation Method 1

an elastic member (50) connected to one side of the piston (30)

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 2

the pressure of the seawater decreases when a velocity of the propulsion system is low, and the pressure of the seawater increases when the velocity of the propulsion system is high

Methodology Applied
Scientific EffectPressure difference: Pressure Gradient

Implementation Method 3

the seawater injected from the injector 4 is used as an oxidant and generates a combustion reaction with a propellant 6, thereby generating power of the propulsion system

Methodology Applied
Scientific EffectCombustion: Combustion

Data Source

PatentUS12486010B2Seawater flow control device for uniform motion
Publication Date: 2025.12.02 AGENCY FOR DEFENSE DEV
  • US12486010B2 patent drawing
  • US12486010B2 patent drawing
  • US12486010B2 patent drawing

AI summary

The present invention relates to a seawater flow control device for a uniform motion, and more particularly, to a seawater flow control device for a uniform motion, which controls a velocity of a propulsion system by adjusting a combustion reaction between seawater and a propellant by adjusting a seawater flow rate depending on the number of operating seawater discharge holes. According to the present invention, it is possible to control the velocity of the propulsion system by increasing the amount of seawater when the velocity of the propulsion system is low and decreasing the amount of seawater when the velocity of the propulsion system is high, thereby implementing a uniform motion of the propulsion system.