Fuel Cell Valve Pressure Equalization
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Solution Overview
Problem
The existing fuel cell systems require a large force to open and close the valve due to pressure differences generated by oxygen reaction after power generation stop, increasing manufacturing costs.
Innovation Solution
A fuel cell system incorporating an air supplier discharger, a valve controller, and a pressure regulator that reduces pressure differences by supplying compressed air and regulating air pressure, allowing the valve to open with minimal force, thus simplifying the configuration and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve is closed during stop of power generation to cut off air from the fuel cell stack, then air supply is effectively stopped, but a large pressure difference is generated between upstream and downstream of the valve, requiring a complex mechanism to open the valve
Solution Approach 1:
The pressure regulator performs preliminary action by reducing the pressure difference between upstream and downstream of the supply shut valve before the valve needs to be opened. This preliminary pressure equalization eliminates the need for a complex high-force mechanism, allowing the valve to be opened easily with a simple actuator.
2Reliability
If a mechanism capable of producing large force is used to open and close the valve against pressure difference, then the valve can be operated reliably, but the manufacturing cost of the fuel cell system increases
Solution Approach 1:
The pressure regulator equalizes pressure before valve operation is needed, transforming the valve opening task from a high-force requirement to a low-force operation. This eliminates the need for expensive high-force actuators and complex mechanisms, significantly reducing manufacturing costs while maintaining reliable valve operation.
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 solution reduces the manufacturing cost and eliminates the need for complex pressure regulation mechanisms, allowing the valve to open with a small force and minimizing foreign substance entry into the fuel cell stack.
Implementation Method 1
The pressure regulator reduces a pressure difference between upstream and downstream of the supply shut valve, before the valve controller opens the supply shut valve
Data Source
AI summary
The problem is that a large force is required to open a flow-dividing shut valve provided in an air supply path for supplying the air to a fuel cell stack at a start of a fuel cell system. This problem is solved by reducing a pressure difference between upstream and downstream of the flow-dividing shut valve, before the flow-dividing shut valve is opened, at a start of the fuel cell system.