Freeze-Resistant Anode Valve with Segmented Flow Regulators
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Solution Overview
Problem
In fuel cell systems, water remaining in the anode loop can freeze and form ice blockages in the anode valve, making it difficult to restart the system, especially in low-temperature environments, as existing solutions require significant energy and time to thaw the ice.
Innovation Solution
An anode valve with a movable member that includes flow regulators to prevent ice formation across the inlet and outlet openings, allowing the valve to be easily opened and closed, and utilizing a magnetic actuator to displace ice when the system is restarted, reducing the need for energy-intensive heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water remains in the anode loop after shutoff in a low-temperature environment, then the fuel cell system can be shut down, but the water may freeze and form ice blockage in the anode valve
Solution Approach 1:
The patent applies preliminary action by designing the movable member to automatically prevent ice formation before it can block the valve. The movable member is positioned to close the passage when water is present, preventing freezing and ice blockage proactively rather than requiring post-freezing remediation actions like heating.
Solution Approach 2:
The patent extracts the harmful effect of ice formation by removing the water that would freeze through the automatic closing action of the movable member. By extracting the water from the passage before freezing occurs, the system prevents ice blockage without requiring additional heating components to remove the harmful ice.
2Productivity
If conventional anode valves are used without ice prevention features, then the device complexity is low, but significant energy and time are required to thaw ice blockages
Solution Approach 1:
The patent prevents the need for energy-intensive thawing operations by taking preliminary action to prevent ice formation in the first place. The movable member automatically closes to prevent water freezing, eliminating the subsequent need for heating elements and long thawing periods, thus improving productivity without increasing energy consumption.
Solution Approach 2:
The system serves itself by using the movable member's automatic closing action to prevent ice formation, eliminating the need for external heating systems or manual intervention to clear ice blockages. The valve protects itself from ice blockage through its own operational mechanism, reducing both energy requirements and restart time.
3Reliability
If the movable member completely closes the passage to prevent ice formation, then ice blockage is prevented, but fluid flow is blocked when the valve should be open
Solution Approach 1:
The patent applies dynamics by making the movable member movable between open and closed positions rather than fixed. The member dynamically adjusts its position based on operational requirements - closing to prevent ice formation when needed and opening to allow fluid flow when the valve should be operational, thus resolving the contradiction between ice prevention and flow control.
Solution Approach 2:
The patent segments the passage into multiple sections, with the movable member closing only a portion of the passage rather than completely blocking it. This segmentation allows the member to prevent ice formation in critical areas while maintaining sufficient open area for fluid flow when the valve is in the open position, balancing ice prevention with operational flow requirements.
Data Source
AI summary
A valve for a fuel cell system includes a valve housing having an inlet and an outlet formed therein. Each of the inlet and the outlet includes a passage formed therein to permit a fluid to flow through the valve housing. A movable member is disposed in the valve housing and is movable between an open position and a closed position. The movable member includes a sliding portion having a first flow regulator and a second flow regulator extending laterally outwardly therefrom. At least a portion of the first flow regulator is disposed in the passage of the inlet and at least a portion of the second flow regulator is disposed in the passage of the outlet when the movable member is in the closed position militating against a formation of ice across the entire opening of the inlet and the outlet.