Hydrogen Recirculation Blower Barrier Layout Against Ignition Risk
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Solution Overview
Problem
Existing hydrogen recirculation blowers in fuel cell systems face the risk of hydrogen ingress into magnetically active regions, leading to potential sparking and ignition, which can cause severe damage or fire.
Innovation Solution
A hydrogen recirculation blower design featuring a rotatable rotor with an impeller and a stator, where a hydrogen barrier is integrated as a hollow body between the rotor and coil windings, preventing hydrogen ingress and protecting magnetically active regions from sparks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seals are used to prevent hydrogen ingress, then hydrogen protection is improved, but the rotating shaft may still allow hydrogen to enter the cavity surrounded by magnetically active regions
Solution Approach 1:
A hydrogen barrier is introduced as an intermediary component between the rotor cavity and the stator windings. This barrier acts as a mediator that blocks hydrogen diffusion paths while allowing the rotating shaft to pass through, preventing hydrogen from reaching magnetically active regions where sparks could ignite it.
Solution Approach 2:
The stator is segmented into two distinct regions: a hydrogen barrier region that prevents hydrogen ingress, and a magnetically active region with coil windings. This segmentation isolates the hazardous hydrogen environment from the spark-prone electrical components, allowing each region to fulfill its specific function safely.
2Reliability
If a hydrogen barrier is added to prevent hydrogen ingress, then safety is improved, but device complexity increases
Solution Approach 1:
The hydrogen barrier function is merged with the existing stator structure rather than being implemented as a completely separate component. The barrier is integrated into the stator assembly, combining the protective function with the magnetic field generation structure, thereby reducing overall device complexity while maintaining safety.
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
Prevents hydrogen ingress into critical components, reducing the risk of sparking and ignition, ensuring safe operation and extending the service life of the blower and vehicle systems.
Implementation Method 1
a hydrogen barrier which is formed as a hollow body, the rotor being arranged in a cavity of the hydrogen barrier, and the hydrogen barrier running both between the rotor and the coil windings and between the impeller and the coil windings
Implementation Method 2
the rotor and the stator forming an electric motor for driving the impeller
Data Source
AI summary
A hydrogen recirculation blower is used in a hydrogen return arrangement in a fuel cell system. The blower includes a rotatable rotor with an end region on which an impeller is arranged, and a stator with coil windings and with a hydrogen barrier which is formed as a hollow body. The rotor is arranged in a cavity of the hydrogen barrier, with the hydrogen barrier running both between the rotor and the coil windings and between the impeller and the coil windings. The rotor and the stator form an electric motor for driving the impeller.