Subsurface Drip Emitter Exit Port Closure Mechanism
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Solution Overview
Problem
Subsurface drip emitters face clogging issues due to grit, insects, and root penetration, with external check valves being impractical and the use of insecticides and herbicides being undesirable.
Innovation Solution
A compact, non-complex, and inexpensive exit port closure mechanism using a flexible diaphragm and stainless steel coil spring to open and close the exit port, preventing the entry of grit, insects, and roots, while ensuring water discharge during operation and sealing when not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the exit port is left open for water discharge, then water delivery efficiency is improved, but the exit port becomes vulnerable to clogging by grit, insects, and roots
Solution Approach 1:
The closure member is positioned to seal the exit port before irrigation begins, preventing clogging by grit, insects, and roots. When water pressure is applied, the diaphragm automatically opens the port to allow water delivery. This preliminary sealing action ensures the port is protected against contaminants before water flow starts.
Solution Approach 2:
The closure member is designed to dynamically transition between open and closed states based on water pressure. During non-irrigation periods, spring pressure keeps the port sealed. During irrigation, water pressure overcomes the spring force to open the port for water delivery. This dynamic behavior resolves the contradiction between keeping the port closed for protection and open for water delivery.
2Reliability
If external check valves are used to prevent clogging, then reliability is improved, but device complexity increases
Solution Approach 1:
The closure function is merged with the emitter body itself. The closure member, diaphragm, and spring are integrated into a compact assembly that forms part of the emitter structure. This eliminates the need for separate external check valves while maintaining clogging prevention functionality, thereby reducing overall device complexity.
Solution Approach 2:
The emitter performs its own closure function through the spring-loaded closure member that automatically seals the exit port when water pressure is absent. This self-service mechanism eliminates the need for external check valves or complex control systems, simplifying the overall device while maintaining reliability.
3Ease of manufacture
If the closure mechanism is made compact and simple, then ease of manufacture is improved, but reliability may be compromised
Solution Approach 1:
The diaphragm is constructed as a flexible thin film that responds to water pressure to open the closure member. This flexible film approach allows for simple manufacturing through molding or forming processes while maintaining reliable sealing when the closure member is in the closed position by spring force.
Solution Approach 2:
The closure mechanism uses simple, inexpensive components such as a molded closure member, flexible diaphragm, and coil spring that can be easily manufactured and replaced if needed. These simple components achieve reliable sealing through proper design geometry and material selection rather than complex mechanisms.
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
Effectively prevents clogging by ensuring the exit port remains sealed when not in use, reducing maintenance and environmental impact, while maintaining efficient water delivery to plant roots.
Implementation Method 1
A flexible diaphragm is mounted in the hollow interior of the valve chamber for movement in response to pressurized water being supplied to the hollow interior through the entry port
Implementation Method 2
A spring moves the closure member to close the at least one exit port when the supply of pressurized water is shut OFF
Data Source
AI summary
A drip emitter for subsurface irrigation includes a valve chamber defining a hollow interior, an entry port and at least one exit port. A flexible diaphragm is mounted in the hollow interior of the valve chamber for movement in response to pressurized water being supplied to the hollow interior through the entry port. The drip emitter further includes a tortuous path water flow channel that limits the flow of water from the hollow interior of the valve chamber to the at least one exit port. A closure member is moved by the flexible diaphragm to open the at least one exit port when pressurized water enters the hollow interior to allow water to be discharged through the at least one exit port. A spring moves the closure member to close the at least one exit port when the supply of pressurized water is shut OFF.