Flow Restrictor Diaphragm for Storm Drainage
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Solution Overview
Problem
Storm drainage systems can become overloaded when the rate of storm water flow exceeds their design capacity, leading to potential flooding in interconnected neighborhoods, as seen when a neighborhood with a modern drainage system experiences excessive rainfall that overwhelms a nearby system incapable of accommodating the volume.
Innovation Solution
A flow restrictor device is attached to storm drain outlets, comprising an exterior and interior tube with flanges and a ring member that compresses to form a watertight seal, limiting the water flow by creating a smaller diameter passage within the pipe, thereby preventing system overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the storm drainage system is designed to accommodate a tremendous volume of storm water, then the system can handle excessive rainfall, but interconnected systems with lower capacity become overloaded causing flooding
Solution Approach 1:
The flow restrictor device incorporates a flexible diaphragm that dynamically adjusts the flow opening based on water pressure. During normal operation, the diaphragm maintains a restricted opening to control flow rate. When excessive pressure builds up (indicating potential overload), the diaphragm deflects to increase the opening, allowing the system to adapt to varying flow conditions and prevent downstream flooding
Solution Approach 2:
The device changes the flow rate parameter by using a spring-loaded mechanism that adjusts the opening size based on pressure differential. The spring force counteracts water pressure, creating a variable restriction that automatically modulates flow to match downstream capacity, thereby preventing overload of interconnected drainage systems
2Object-affected harmful factors
If a flow restrictor is installed to limit water flow rate, then downstream systems are protected from overload, but the upstream system may experience increased pressure buildup
Solution Approach 1:
The flexible diaphragm creates a dynamic pressure relief mechanism that opens progressively as upstream pressure increases. This prevents excessive pressure buildup by allowing controlled泄压 (pressure release) when the spring force is overcome by water pressure, balancing flow restriction with pressure management
Solution Approach 2:
The spring-loaded diaphragm mechanism provides beforehand cushioning by using the spring to absorb and gradually release pressure buildup. The spring acts as a cushion that prevents sudden pressure spikes while maintaining flow restriction, protecting the upstream system from excessive stress
3Manufacturing precision
If the flow restrictor uses a complex sealing mechanism to ensure watertight closure, then flow control precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The device uses a simple elastomeric diaphragm that can be easily replaced rather than a complex mechanical sealing system. The diaphragm provides adequate sealing through its elastic properties and can be replaced as a single component, reducing manufacturing complexity while maintaining functional precision
Solution Approach 2:
The elastomeric diaphragm uses a flexible thin film to achieve both sealing and flow control functions. This single component replaces what would otherwise require multiple rigid sealing elements and adjustment mechanisms, simplifying the device while maintaining precision through the film's elastic deformation characteristics
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 flow restrictor effectively restricts water flow, preventing system overload and subsequent flooding by ensuring a controlled rate of water discharge, thus protecting neighborhoods from flood damage.
Implementation Method 1
the luminal surface of the ring member is disposed around and in contact with the exterior tube. When the flow restrictor is attached to the pipe, the ring member is compressed radially outward by the pipe to form a watertight seal
Implementation Method 2
the ring member is longitudinally compressed by the fastener between the annular rib of the first flange and the second flange
Data Source
AI summary
A flow restrictor includes an exterior tube and an interior tube disposed within the exterior tube. A first flange is disposed at a distal end of the interior tube. An annular rib extends proximally from the first flange and has an interior diameter greater than an exterior diameter of the exterior tube. A second flange is disposed at a proximal end of the exterior tube. A ring member is disposed around the exterior tube between the annular rib of the first flange and the second flange.