Fuel Cell Piping Inversion for Water Prevention
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Solution Overview
Problem
Conventional fuel cell systems face malfunctions due to water corrosion and freezing issues in the fuel gas supply system, particularly when not in operation, and height constraints become a challenge when mounting under a vehicle floor.
Innovation Solution
A fuel cell system design featuring a piping member with bent portions that reverse the fuel gas supply direction relative to the flow direction at the junction between the fuel gas supply and recirculating systems, preventing water ingress and utilizing auxiliary machines to optimize space and protect components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the upstream part of the fuel gas supply system is disposed higher than the junction between the fuel gas recirculating system and the fuel gas supply system, then water can be prevented from flowing into the fuel gas supply system, but the height of the fuel cell system becomes higher
Solution Approach 1:
Instead of raising the upstream part of the fuel gas supply system to prevent water ingress (conventional approach), the patent inverts the approach by providing bent portions in the piping member that create a flow direction reversal. The bent portions are configured such that the supply direction of fuel gas from the supply source is substantially opposite to the flowing direction of fuel gas toward the junction, preventing water from the recirculating system from flowing into the supply system without increasing height.
Solution Approach 2:
The patent applies curvature by providing bent portions in the piping member. These bent portions are curved in a specific manner to reverse the flow direction of fuel gas. The curvature of the piping creates a configuration where water flowing in the recirculating system cannot easily enter the supply system, while maintaining a compact height suitable for mounting under the vehicle floor.
2Area of stationary object
If the fuel cell is mounted under the floor of the vehicle, then space utilization is improved, but height restrictions make it difficult to reserve mounting space
Solution Approach 1:
The patent resolves the height restriction issue by changing the spatial arrangement from a vertical configuration to a horizontal configuration. Instead of using height to prevent water ingress (vertical dimension), the bent portions use horizontal curvature to achieve the same protective function. This allows the fuel cell system to be mounted under the vehicle floor with minimal height requirement, effectively utilizing the horizontal space available in the vehicle.
3Reliability
If water flows into the fuel gas supply system, then corrosion and freeze of components occur, but preventing water flow requires additional structural complexity
Solution Approach 1:
The bent portions in the piping member serve multiple functions: they reverse the flow direction of fuel gas, prevent water ingress from the recirculating system, and maintain a compact overall system height. This multi-functionality eliminates the need for separate protective devices or complex additional structures, achieving water prevention while keeping the piping configuration relatively simple and integrated.
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 water-induced corrosion and freezing malfunctions while maintaining a compact system height, effectively utilizing space and protecting components from collisions.
Implementation Method 1
a piping member that connects a junction between the fuel gas supply system and the fuel gas recirculating system with the supply source, the piping member having a bent portion that is curved such that a supply direction of the fuel gas from the supply source is reverse to a flowing direction of the fuel gas toward the junction
Data Source
AI summary
A fuel cell system, includes: a fuel cell stack that is formed by stacking fuel cells for causing electrochemical reaction of a fuel gas and an oxidizing gas; a fuel gas supply system that is configured to supply the fuel gas to the fuel cell stack from a supply source of the fuel gas; a fuel gas recirculating system that is configured to resupply to the fuel cell stack the fuel gas discharged from the fuel cell stack; and a piping member is configured to connect a junction between the fuel gas supply system and the fuel gas recirculating system with the supply source, the piping member having a bent portion that is curved such that a supply direction of the fuel gas from the supply source is reverse to a flowing direction of the fuel gas toward the junction.