Autonomous Irrigation System Using Swellable Element
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Solution Overview
Problem
Existing irrigation systems often fail to provide tailored watering solutions for plants, leading to either overwatering or underwatering due to their 'one-size-fits-all' approach, and electronic systems can be costly and complex, while non-electronic systems that sense moisture near the soil surface may inadvertently overwater plants by not accounting for moisture levels at the root base.
Innovation Solution
An autonomous, non-electronic irrigation system that uses a swellable element and moisture transfer adapter to regulate water flow based on moisture levels at the root base, ensuring optimal watering by adjusting the compressive force on a flexible tube to control water flow, preventing both overwatering and underwatering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-size-fits-all irrigation system is used, then the system complexity is reduced, but the irrigation precision deteriorates leading to overwatering or underwatering
Solution Approach 1:
The irrigation system is segmented into multiple independent sensor units, each monitoring moisture at different soil depths. Each segment operates autonomously to control water delivery to specific plant zones, enabling precise irrigation without complex centralized control systems.
Solution Approach 2:
The system implements local quality by placing moisture sensors at different soil depths (surface layer and root zone) to detect moisture conditions specific to each location. This allows the system to deliver water based on actual local needs rather than applying uniform irrigation across all plants.
2Extent of automation
If electronic irrigation systems are used, then the automation level increases, but the manufacturing cost and device complexity increase
Solution Approach 1:
The irrigation system employs self-service through passive mechanical components that automatically respond to moisture conditions. The buoyant element rises and falls with soil moisture levels, mechanically opening or closing water flow paths without requiring electronic sensors, power sources, or control circuits.
Solution Approach 2:
The system replaces electronic sensing and control mechanisms with a mechanical buoyancy-based sensing system. The buoyant element's physical response to moisture-induced soil expansion provides automatic control, substituting complex electronic automation with simple mechanical principles.
3Device complexity
If moisture sensing is performed near the soil surface, then the device complexity is reduced, but the irrigation precision deteriorates causing overwatering
Solution Approach 1:
The sensing system is segmented into multiple depth levels with separate buoyant elements positioned at the soil surface and at the root zone depth. Each segment independently monitors moisture at its specific depth, enabling the system to distinguish between surface evaporation and actual root zone moisture needs.
Solution Approach 2:
The system adds the depth dimension to moisture sensing by placing sensors at different vertical levels in the soil profile. This dimensional approach allows differentiation between surface conditions and subsurface root zone conditions, providing accurate irrigation control based on where plants actually absorb water.
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
This system effectively maintains consistent moisture levels at the roots of plants, preventing both drought and waterlogged conditions, and can be used for various plants with different watering needs without the need for electronic components or complex setups.
Implementation Method 1
a swellable element and moisture transfer adapter to regulate water flow based on moisture levels at the root base
Implementation Method 2
a swellable element disposed within the housing adjacent the irrigation tube and configured to swell from moisture absorption
Implementation Method 3
Exposure to ambient air causes water to evaporate from the swellable element
Implementation Method 4
a moisture transfer adapter for communicating moisture levels in a desired location to the swellable element
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A system, comprising: a housing comprising an elongated hollow body configured to be at least partially embedded in a soil environment adjacent a plant at a desired depth; a swellable element dimensioned to be disposed within the housing, the swellable element being configured to swell when absorbing moisture; a resiliently- compressible flexible tube configured to provide water to the soil environment, the flexible tube is laced transversely through tube openings of the housing, the flexible tube is disposed adjacent to the swellable element inside the housing such that a swelling or displacement of the swellable element compresses the flexible tube, thereby limiting or preventing water flow therethrough; and a moisture transfer adapter configured to communicate moisture along its length from a desired location within the soil environment to the swellable element, as well as methods of using the system are provided.