Suction Hopper Dredger Overflow Valve for Low-Turbulence Discharge
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Solution Overview
Problem
Suction hopper dredgers face challenges in minimizing the diffusion of fine particles like sand and clay into the water environment, leading to contamination, due to turbulence in the overflow system, which is exacerbated by mechanical parts that are sensitive to changing water levels.
Innovation Solution
An environmental valve with an inflatable element in the overflow pipe that adjusts flow without mechanical parts, maintaining a stable and laminar flow by being adaptable to water level changes and ensuring minimal turbulence, with a spherical shape in the inflated condition to direct particles downward.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical parts are used in the environmental valve to adjust flow, then the valve can control water level, but the valve becomes sensitive to changing water levels and may malfunction
Solution Approach 1:
The patent replaces mechanical adjustment parts with an inflatable element that can be inflated or deflated to adjust the flow area of the overflow pipe. This eliminates complex mechanical moving parts that are sensitive to water level changes, while still providing effective flow control capability through pneumatic actuation of the inflatable element.
Solution Approach 2:
The patent uses an inflatable element that can be filled with fluid (air or water) to adjust the flow characteristics of the overflow system. By controlling the inflation state, the valve can regulate water flow without requiring mechanical moving parts, thereby improving reliability while maintaining operational control.
2Productivity
If water flow speed is increased to improve productivity, then more water can be discharged, but turbulence increases causing fine particles to diffuse and contaminate water
Solution Approach 1:
The patent applies different flow conditions at different locations: the main overflow provides high flow rate for productivity, while the environmental valve provides low flow speed control for environmental protection. The inflatable element in the environmental valve locally adjusts flow characteristics to maintain laminar flow conditions that prevent particle diffusion, while the overall system maintains high productivity through the main overflow channel.
3Object-affected harmful factors
If the water level in the overflow is kept slightly below the hopper level to maintain laminar flow, then particle diffusion is minimized, but the valve must be highly sensitive to water level changes
Solution Approach 1:
The patent replaces sensitive mechanical level-sensing and adjustment mechanisms with an inflatable element controlled by pneumatic or hydraulic pressure. The inflatable element automatically responds to water level changes through pressure differential without requiring precise mechanical measurement, thereby maintaining laminar flow conditions while eliminating the need for highly sensitive mechanical components.
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 inflatable valve minimizes the risk of particle diffusion near the dredger by maintaining a stable flow profile, reducing turbulence and ensuring effective sedimentation of small particles, thus preventing water contamination.
Implementation Method 1
the valve comprises an inflatable element located in the pipe
Implementation Method 2
maintaining the water flow at a low flow speed, so that turbulence in the water is minimal and the flow is laminar
Implementation Method 3
direct small particles downwardly below the dredger
Implementation Method 4
the dredged material settles in the hopper while the surplus water leaves the hopper through the overflow
Data Source
Figure 1
Figure 2~4
AI summary
A suction hopper dredger (1) comprises a hopper (3) for collecting and precipitating solids in dredged material. The hopper (3) is provided with an overflow (4) including a pipe (5) for transporting liquid from the hopper (3) to the environment of the dredger (1) and a valve for adjusting flow through the pipe (5). The valve comprises an inflatable element (6) located in the pipe (5).