Capacitive Sensing Conduit for Non-Obstructive Fluid Discharge Detection
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Solution Overview
Problem
Existing fluid discharge detection systems for temperature and pressure relief valves do not effectively sense fluid discharge without obstructing the flow, and there is a need to distinguish between excess temperature and pressure conditions while complying with regulatory requirements.
Innovation Solution
A capacitive sensor system that measures capacitance changes in a sensing conduit coupled to a discharge conduit, allowing for the detection of fluid discharge events without obstructing the flow, and differentiates between excess temperature and pressure conditions based on the rate of capacitance change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is installed in the discharge line to detect fluid discharge, then fluid discharge detection capability is improved, but the discharge line flow may be obstructed violating regulatory codes
Solution Approach 1:
The patent introduces an intermediary sensing conduit that is fluidly coupled to the discharge line through a control valve. This intermediary conduit allows the capacitive sensor to detect fluid discharge indirectly without placing any obstruction in the main discharge line, thus resolving the contradiction between detection capability and flow obstruction prevention
Solution Approach 2:
The system segments the detection function from the discharge flow path by creating a separate sensing conduit that is only fluidly connected when the control valve activates. This segmentation allows independent operation of detection and discharge functions without mutual interference
2Reliability
If a control valve is added to couple the discharge conduit to the sensing conduit, then non-invasive detection is enabled, but device complexity increases
Solution Approach 1:
The control valve is configured to automatically activate based on predetermined conditions detected within the discharge conduit, such as pressure or flow thresholds. This self-service capability eliminates the need for external control mechanisms, reducing overall system complexity while maintaining reliable non-invasive detection
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
Enables non-invasive detection of fluid discharge events, providing timely alerts and minimizing water damage by distinguishing between temperature and pressure-related discharges without violating regulatory codes, ensuring safe and efficient operation of fluid systems.
Implementation Method 1
a sensor disposed about the sensing conduit... measure a capacitance value of the sensing conduit; detect a change in the sensing conduit capacitance value
Data Source
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AI summary
A fluid discharge event detection apparatus measures a change in capacitance to detect the presence of a fluid in a sensing conduit where the presence of fluid indicates a discharge event. The apparatus includes a first conduit, the sensing conduit and a control valve, coupled between the first conduit and the sensing conduit. The control valve is configured to activate and fluidly couple the first conduit and the sensing conduit to one another when the control valve detects at least one predetermined condition of a fluid within the first conduit. A sensor, configured to measure a capacitance value, is disposed about the sensing conduit. A controller, coupled to the sensor, is configured to detect a change in the sensing conduit capacitance value and assert an alarm condition upon detection of the change in the sensing conduit capacitance value.