Elastomeric Drip Emitter Pressure Compensation
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Solution Overview
Problem
Current irrigation drip emitters face issues with inconsistent water output due to pressure fluctuations, clogging from particulates, and inefficiencies in water distribution, particularly in subsurface applications, where pressure compensation and particulate deflection are needed to maintain consistent flow rates and prevent obstruction.
Innovation Solution
The development of an improved in-line drip emitter with a unitary elastomeric body featuring a pressure-reducing flow channel and pressure compensating mechanism, including a tapered inner baffle wall and movable baffle portions, which adjusts to maintain constant flow rates and deflects particulates, ensuring efficient water distribution and minimizing clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional drip emitter is used, then the emitter can reduce high pressure water to low pressure water, but the flow rate becomes inconsistent due to pressure fluctuations along the supply tube
Solution Approach 1:
The emitter incorporates a movable baffle wall that can dynamically adjust its position in response to pressure changes. The baffle wall moves between a first position at high pressure and a second position at low pressure, automatically compensating for pressure fluctuations to maintain consistent flow rate throughout the supply tube.
Solution Approach 2:
The emitter changes the geometric parameters of its flow channel by moving the baffle wall between different positions. This alters the flow channel's cross-sectional area and length to compensate for pressure variations, ensuring stable flow rate output despite changing pressure conditions.
2Productivity
If the flow channel cross-sectional area is reduced to lower pressure, then water distribution efficiency improves, but the emitter becomes more susceptible to clogging from particulates
Solution Approach 1:
The baffle wall dynamically adjusts the flow channel's cross-sectional area based on operating conditions. At normal operation, the wall positions to create an optimized flow path for efficient water distribution. When pressure changes occur, the wall moves to maintain appropriate flow characteristics while preventing particulate accumulation.
Solution Approach 2:
The emitter uses the water flow itself to drive the baffle wall movement, which automatically adjusts the flow channel geometry. This self-regulating mechanism ensures optimal flow efficiency without requiring external control systems or manual adjustment.
3Area of stationary object
If multiple emitters are mounted along the supply tube, then water distribution coverage increases, but pressure loss accumulates causing the last emitter to have greater pressure loss than the first
Solution Approach 1:
Each emitter along the supply tube is equipped with a movable baffle wall that independently responds to local pressure conditions. This allows each emitter to compensate for its position in the series, with emitters farther from the water source automatically adjusting to maintain consistent flow rate despite cumulative pressure losses.
Solution Approach 2:
The emitters change their internal flow channel parameters by moving the baffle wall to compensate for position-dependent pressure losses. This ensures that all emitters, regardless of their location along the supply tube, operate with similar pressure conditions and flow rates.
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 solution ensures consistent water output across the irrigation system, reduces clogging, and enhances water distribution efficiency by compensating for pressure changes and deflecting particulates, thereby improving the reliability and performance of irrigation systems in both subsurface and above-ground applications.
Implementation Method 1
the body is made of an elastomeric material... the body deflects in response to changes in pressure
Implementation Method 2
pressure compensating mechanism... compensating for pressure changes... pressure-reducing flow channel
Data Source
AI summary
An irrigation drip emitter, and methods relating to same, are provided for delivering irrigation water from a supply tube to an emitter outlet at a reduced and relatively constant flow rate. The emitter having at least one movable member for compensating for fluctuations in supply line fluid pressure. In one form, the movable member includes a tapered baffle section movable between a first position wherein fluid is allowed to flow over the tapered baffle section and a second position wherein fluid is prevented from flowing over at least a portion of the tapered baffle section and the tapered baffle section effectively lengthening the extent of a pressure reduction passage. In another form, first and second movable members are provided for compensating for such pressure fluctuations. In another form, a plurality of inputs is provided which are movable between first and second positions to compensate for such pressure fluctuations.