Leak Detection via Force Transduction in Pipe Networks
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Solution Overview
Problem
Current leak detection methods in water distribution networks are expensive, time-consuming, inaccurate, and dependent on pipe material, with acoustic methods being ineffective in plastic pipes due to signal attenuation and environmental interference, and existing pressure suction methods require a large number of sensors to detect leaks.
Innovation Solution
A leak detection system using a rigid body supported by leaf springs with transducers to detect displacement caused by suction pressure gradients, allowing for leak localization with a small number of sensors and independent of pipe material or environmental factors, featuring a locomotive device for axial motion along the pipe and suction cups to enhance suction force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic leak detection methods are used, then leak detection is effective in metal pipes, but the method becomes ineffective in plastic pipes due to high signal attenuation and noise interference
Solution Approach 1:
The patent replaces acoustic detection methods with a mechanical force-based detection system. A movable sensor mass is positioned inside the pipe, and leak-induced pressure differences create mechanical forces that displace the sensor mass. This mechanical substitution eliminates dependence on acoustic signal propagation through the pipe wall, making the system effective for both metal and plastic pipes regardless of signal attenuation characteristics.
2Measurement precision
If pressure suction method with many sensors is used, then leak detection accuracy is improved, but system cost and complexity increase significantly
Solution Approach 1:
The patent introduces a movable sensor mass as an intermediary element that amplifies the effect of leak-induced pressure differences. Instead of using multiple fixed pressure sensors to detect small pressure gradients, a single (or few) force-sensitive sensor(s) track the displacement of the movable mass, which concentrates and magnifies the mechanical effect of the leak force, thereby improving detection accuracy while reducing sensor quantity.
Solution Approach 2:
The patent changes the detection parameter from direct pressure measurement to force/displacement measurement. By monitoring the position of the movable sensor mass rather than measuring small pressure differences directly, the system transforms the measurement into a more sensitive and accurate domain, enabling reliable leak detection with fewer sensors.
3Reliability
If more sensors are deployed for leak detection, then detection coverage is improved, but system cost and power consumption increase
Solution Approach 1:
The patent replaces electronic sensor arrays with a mechanical detection system using a movable sensor mass. This mechanical system passively responds to pressure differences through physical force, eliminating the need for multiple powered electronic sensors. The system achieves comprehensive detection coverage along the pipe section while consuming minimal power, as the movable mass naturally migrates in response to leak-induced pressure gradients without requiring active electronic scanning or multiple independent sensing elements.
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
Reduces the number of sensors needed, lowers system costs, improves reliability, and enhances accuracy by transforming localized pressure gradients into detectable forces, enabling effective leak detection and localization in various pipe materials and environments.
Implementation Method 1
This displacement indicates a leak when the rigid body is moved by a suction force generated by a local pressure gradient resulting from a leak within a pipe network
Implementation Method 2
A leak detection system using a rigid body supported by leaf springs with transducers to detect displacement caused by suction pressure gradients
Implementation Method 3
the rigid body is supported with respect to the outer cage by leaf springs
Implementation Method 4
Springs may include transducers responsive to leaf spring deflection thereby producing a signal proportional to the rigid body motion with respect to the outer cage
Implementation Method 5
The suction force can be significantly augmented by the addition of pressure-encapsulating suction cups
Data Source
AI summary
Leak detection system. A rigid body is resiliently supported within an outer cage. Structure is provided for detecting displacement of the rigid body with respect to the outer cage, the displacement indicating a leak when the rigid body is moved by a suction force generated by a local pressure gradient resulting from a leak within a pipe network. The invention allows a leak to be determined around the circumference of a pipe.