Fuel Cell Closing Valve With Magnetic Latching Against Oxygen Diffusion
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Solution Overview
Problem
Fuel cell systems face challenges in preventing oxygen diffusion from the cathode to the anode, leading to high electrical potential differences that cause catalyst aging, and frequent air/air starts, which can lead to catalyst poisoning.
Innovation Solution
A fuel cell closing system with a valve closing body that uses permanent magnets to hold the valve in position when the electrical coil is deenergized, allowing for precise control of medium passage closure and prevention of oxygen diffusion, featuring a valve disk, guide rod, and O-ring seals, and utilizing a 3/2 or 2/2 directional valve configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional valve without permanent magnets is used, then the device complexity is low, but the valve cannot be reliably held in both open and closed positions, leading to frequent air/air starts and catalyst aging
Solution Approach 1:
The patent replaces conventional mechanical spring-based positioning systems with an electromagnetic field-based system using permanent magnets and an electrical coil. The permanent magnets create magnetic fields that hold the valve closing body in stable positions (first and second positions) without mechanical contact, eliminating the need for complex mechanical springs and latch mechanisms while improving reliability.
Solution Approach 2:
The patent changes the physical state and properties of the valve closing body by incorporating permanent magnets and making the body itself ferromagnetic. This allows the valve to be actuated and positioned through electromagnetic field interactions rather than mechanical forces, enabling reliable position holding with simpler overall structure.
2Force
If the valve closing body is made ferromagnetic for electromagnetic actuation, then the electromagnetic actuation works effectively, but the closing force may be insufficient without additional magnetic components
Solution Approach 1:
The patent replaces mechanical closing force mechanisms with electromagnetic forces generated by permanent magnets. The permanent magnets create strong magnetic fields that act on the ferromagnetic valve closing body, providing sufficient closing force without complex mechanical linkages or spring systems.
Solution Approach 2:
The patent uses composite magnetic structures combining permanent magnets with ferromagnetic materials in the valve closing body. This combination creates a synergistic effect where the permanent magnets provide the magnetic field and the ferromagnetic body provides both the target for magnetic attraction and structural integrity, achieving high closing force efficiently.
3Reliability
If permanent magnets are added to hold the valve in position, then the valve position stability improves, but the manufacturing cost increases
Solution Approach 1:
The patent replaces complex mechanical positioning mechanisms with permanent magnets, which are relatively inexpensive components. The simplicity of the magnetic field-based positioning system reduces manufacturing complexity and assembly steps, offsetting the cost of the permanent magnets themselves and potentially reducing overall manufacturing costs.
4Speed
If the valve closing body is moved electromagnetically, then the actuation speed and precision improve, but the energy consumption increases
Solution Approach 1:
The patent uses periodic or pulsed electrical energization of the coil rather than continuous power supply. The coil is energized only momentarily to switch the valve between positions, while the permanent magnets maintain the valve position without additional energy input. This dramatically reduces energy consumption compared to continuously powered electromagnetic actuators.
Solution Approach 2:
The permanent magnets provide self-sustaining magnetic fields that maintain valve position without requiring continuous external energy input. Once the valve is positioned through brief coil energization, the permanent magnets automatically maintain the position, making the system self-sustaining and energy-efficient during the holding phase.
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
The system effectively reduces the number of air/air starts, minimizes catalyst aging, and allows for controlled humidification and isolation, thereby extending the fuel cell's service life and reducing the risk of poisoning.
Implementation Method 1
the fuel cell closing valve comprises two permanent magnets by means of which, in an electrically deenergized state of the electrical coil, the valve closing body can be held both in the first position and in the second position
Implementation Method 2
a valve closing body which, by electrical energization of an electrical coil, can be moved electromagnetically from a first position into a second position
Data Source
AI summary
The invention relates to a fuel cell closing valve (36) having a valve closing body (5), which is electromagnetically movable from a first position to a second position by the energizing of an electrical coil (10) in order to close or open at least one medium passage of a fuel cell. In order to optimize the operation of the fuel cell system, the fuel cell closing valve (36) comprises two permanent magnets (13, 14), by means of which the valve closing body (5) can be held both in the first position and in the second position when the electrical coil (10) is in a currentless state.