Selfcompensated Fluid Emitter Membrane Positioning
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Solution Overview
Problem
Existing fluid emitters in irrigation systems face challenges in independently adjusting flow rate and pressure, leading to material degradation and increased costs due to reliance on expensive, high-elasticity membranes that saturate under extreme pressure conditions, and are prone to wear and functionality loss.
Innovation Solution
A self-compensated, adjustable fluid emitter design that mechanically changes the membrane's position and elastic behavior, allowing for independent adjustment of flow rate and pressure through means such as movable cup-like half-shells and spring-loaded deformation, reducing pressure effects and enabling longer-lasting, cost-effective operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the membrane is made of expensive high-elasticity material to guarantee lasting elastic behavior, then the reliability and duration of action are improved, but the manufacturing cost increases considerably
Solution Approach 1:
The device is divided into two functional chambers separated by the membrane: a first chamber for receiving pressure fluid and a second chamber for delivering the fluid. This segmentation allows the membrane to work in a controlled environment where it only needs to respond to pressure differences, reducing the need for extremely high-elasticity materials while maintaining reliability
Solution Approach 2:
The membrane acts as an intermediary element between the pressure fluid source and the delivery system. By positioning the membrane to be deformed by pressure difference rather than directly exposed to extreme pressures, the system achieves reliable flow control with materials of moderate elastic properties, reducing costs
2Productivity
If the membrane operates under high pressure difference conditions for long time, then the productivity is improved, but the material undergoes inelastic deformation and loses elastic recovery capability
Solution Approach 1:
The membrane is pre-positioned and pre-loaded in a controlled manner during assembly. The initial positioning ensures that the membrane operates within its elastic range even under prolonged high pressure conditions, preventing inelastic deformation and maintaining service life
Solution Approach 2:
The system changes the operating parameters of the membrane by controlling the pressure difference across it through the two-chamber design. The membrane experiences controlled deformation within elastic limits rather than extreme pressures, allowing prolonged operation without material degradation
3Device complexity
If the flow rate is adjusted solely by structural and elasticity characteristics of the membrane, then the device complexity is reduced, but the adjustment range is limited and saturation effect occurs
Solution Approach 1:
The membrane positioning is made dynamic and adjustable rather than fixed. The membrane can be positioned at different distances from the outlet spout, creating variable initial conditions that expand the flow rate adjustment range while maintaining relatively simple device structure
Solution Approach 2:
The system preemptively addresses the saturation effect by allowing manual adjustment of membrane position. This preliminary action enables the user to reset or reposition the membrane before saturation occurs, extending the effective adjustment range without adding complex automated control mechanisms
4Quantity of substance
If the membrane is perforated to allow fluid passage, then the fluid flow is enabled, but the membrane becomes highly sensitive to wear and prone to breaking
Solution Approach 1:
The fluid passage function is extracted from the membrane itself and placed in a separate outlet spout. The membrane remains intact and non-perforated, serving only as a pressure-responsive diaphragm, while the outlet spout provides the fluid passage pathway. This separation eliminates wear on the membrane from direct fluid contact
Solution Approach 2:
The outlet spout acts as an intermediary between the membrane and the fluid delivery system. The membrane deforms to control pressure without directly exposing its structure to fluid flow, and the outlet spout mediates the fluid passage, protecting the membrane from wear and breaking
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 emitter maintains constant flow rates across varying pressure conditions, reduces material costs, and extends the operational lifespan of emitters by decoupling flow rate and pressure adjustments, ensuring reliable performance across different irrigation cycles without shocking plants.
Implementation Method 1
the membrane is deformed going closer to the outlet while the flow rate of the fluid increases when the membrane is deformed going farther away from said outlet, therefore the flow rate of the fluid through said outlet is controlled and kept constant by means of said membrane despite fluid pressure variations
Implementation Method 2
the continuous elastic stress of the material composing the membrane can cause the ageing of the material with regard to elastic characteristics
Implementation Method 3
when the membrane has to operate for a long time under high pressure difference conditions, the material can be inelastically deformed or stretched and so the elastic recovery to the original configuration cannot occur
Data Source
Figure 1
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Figure 4
AI summary
A selfcompensated, Adjustable fluid emitter comprising a casing externally delimiting a volume which is divided into a first chamber and into a second chamber by a fixed membrane that can be elastically deformed; an inlet communicating with said first chamber; an outlet communicating with said second chamber; said first and said second chamber being in communication one with the other by means of at least a communicating duct; said membrane being deformed such that at least a portion thereof changes its position with respect to said outlet, modifying the flow rate of the fluid through said outlet depending on the pressure difference and so on the flow rate of the fluid through said outlet is controlled and kept constant by said membrane in spite of changes in the fluid pressure at least at the inlet or outlet.