Multi-Path Leak Inspection Using Differential Gas Pressure
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Solution Overview
Problem
Existing leak inspection devices for fuel cell stacks can only inspect a single flow path efficiently, making it difficult to assess the leakage states of multiple flow paths simultaneously.
Innovation Solution
A leak inspection apparatus and method that supplies inspection gas to multiple flow paths at different pressures, using flowmeters to measure gas flow rates and a computer to determine leakage by distinguishing between defects in intermediate members and non-defects, allowing for simultaneous inspection of multiple flow paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-channel leak inspection device is used, then the inspection process is simple, but it cannot efficiently inspect multiple flow paths simultaneously
Solution Approach 1:
The inspection system is segmented into multiple independent inspection channels, each capable of inspecting a specific flow path. Each channel includes its own gas supply unit, flowmeter, and control logic, allowing parallel inspection of multiple flow paths while maintaining operational independence and simplicity within each segment
Solution Approach 2:
The inspection device is designed with universal components that can serve multiple functions. The gas supply unit, flowmeters, and control system are configured to handle multiple flow paths simultaneously, enabling a single device to perform both simple single-channel inspection and complex multi-channel inspection tasks
2Measurement precision
If inspection gas is supplied to multiple flow paths at different pressures, then leakage detection accuracy is improved, but the control complexity increases
Solution Approach 1:
Each flow path is assigned a specific inspection pressure tailored to its characteristics and leakage risk profile. The gas supply units are configured to provide different pressures to different flow paths locally, improving detection accuracy for each specific path while maintaining overall system manageability through decentralized pressure control
Solution Approach 2:
The system utilizes pressure as a variable parameter to enhance leakage detection. By changing the inspection pressure for different flow paths and monitoring the resulting flow rate changes, the system achieves high detection accuracy. The control computer automatically adjusts and manages these pressure parameters based on pre-set inspection protocols
3Loss of time
If simultaneous inspection of multiple flow paths is performed, then inspection time is reduced, but the difficulty of analyzing leakage sources increases
Solution Approach 1:
The system incorporates real-time feedback through flowmeters that continuously monitor gas flow rates in each flow path. The control computer receives feedback data from all channels simultaneously and automatically analyzes the results to identify leakage sources. The feedback mechanism includes comparing expected versus actual flow rates, isolating defective flow paths, and providing clear diagnostic information that simplifies leakage source identification even during simultaneous multi-path inspection
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 efficient inspection of leakage states across multiple flow paths, reducing inspection time and gas consumption by identifying defects in seal lines, electrode assemblies, and separators within the fuel cell stack.
Implementation Method 1
a gas supply unit configured to supply inspection gas to the first flow path at a first pressure and supply the inspection gas to the second flow path at a second pressure lower than the first pressure
Implementation Method 2
flowmeters configured to measure flow rates of the inspection gas flowing out from each of the first flow path and the second flow path
Data Source
AI summary
Leak-inspection-apparatus inspecting leakage-state of product including first/second-paths. First/second-paths are separated from external-space through first-member and separated from each other through second-member. Leak-inspection-apparatus includes: gas-supply-unit supplying gas to first-path at first-pressure and second-path at second-pressure lower than first-pressure; flowmeters measuring flow rates of gas from first/second-path; and computer. Computer: performs first-determination to determine leakage of gas from first/second-path to external-space based on flow rates measured in first-period after gas supply; and performs second-determination to determine leakage of gas from first-path to second-path based on flow rates measured in second-period after first-period. In first-determination, computer determines that there is defect in first-member when leakage is determined, while determines that there is no defect in first-member when no leakage is determined. In second-determination, computer determines that there is defect in second-member when leakage is determined, while determines that there is no defect in second-member when no leakage is determined.