Fuel Cell Separator Flow Rectifying Portion Adhesion
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Solution Overview
Problem
In fuel cell separators, the flow path ribs used to rectify fluid flow are prone to separation from the main body due to pressure from reactive gases or coolants, leading to inefficiencies and potential manufacturing challenges.
Innovation Solution
The integration of a flow rectifying portion with protruded portions and a coupling portion, both made of the same elastic material, which adheres to the separator main body, enhances adhesion and reduces separation, while also allowing for easier manufacturing through injection molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If flow path ribs are formed of a material different from the separator main body and adhered to it, then flow rectification is achieved, but the flow path rib may separate from the separator main body due to pressure from fluid flow
Solution Approach 1:
The flow rectifying portion is integrated with the separator main body as a single component, eliminating the interface between separate parts. The flow rectifying portion and separator main body are both formed of the same elastic material through injection molding, creating a unified structure that cannot separate under fluid pressure while maintaining flow rectification functionality.
Solution Approach 2:
The flow rectifying portion and separator main body are made of the same elastic material, ensuring homogeneous material properties throughout the structure. This eliminates material interface issues and ensures uniform deformation and adhesion characteristics under operating conditions, preventing separation.
2Ease of operation
If multiple protruded portions are provided independently to rectify flow, then flow rectification is improved, but the adhesion area is reduced and separation risk increases
Solution Approach 1:
Multiple protruded portions are merged into a single integrated flow rectifying portion structure. This unified structure provides continuous adhesion to the separator main body across the entire base area, while the protruded portions extend upward to perform flow rectification without compromising adhesion area.
Solution Approach 2:
The flow rectifying portion utilizes three-dimensional structure with protruded portions extending in the vertical direction while maintaining a continuous base for adhesion. This dimensional approach allows multiple flow rectification elements to coexist without reducing the two-dimensional adhesion area on the separator main body.
3Strength
If the coupling portion is arranged between the protruded portions to connect them, then structural integrity is improved, but the cross-sectional area of the flow path is reduced
Solution Approach 1:
The coupling portion is designed as a thin connecting structure that provides sufficient structural integrity to hold the protruded portions in position while minimizing obstruction to fluid flow. The thin film approach ensures the coupling portion is strong enough for structural purposes but thin enough to reduce flow resistance.
4Adaptability or versatility
If the flow rectifying portion is formed by adhering separate components, then manufacturing flexibility is improved, but manufacturing time and cost increase
Solution Approach 1:
The flow rectifying portion and separator main body are merged into a single component manufactured through injection molding. This consolidation eliminates separate manufacturing steps for the flow rectifying portion, reducing manufacturing time and cost while maintaining design flexibility through mold configuration options.
Solution Approach 2:
The injection molding process serves multiple functions: it forms both the separator main body and the integrated flow rectifying portion in a single operation. This multi-functional manufacturing approach improves efficiency while maintaining the adaptability to design different geometries through mold design.
Data Source
AI summary
In a fuel cell separator and the like, a technology for reducing the separation of a flow path rib which rectifies the flow of a fluid is desired.A separator used in a fuel cell is provided, the separator including: a separator main body that includes a fluid flow region through which a reactive gas or a coolant flows, a through-hole through which the reactive gas or the coolant flows, and a connection portion which connects the fluid flow region and the through-hole; and a flow rectifying portion that is arranged by being adhered on the connection portion and that rectifies flow of the reactive gas or the coolant between the fluid flow region and the through-hole, where the flow rectifying portion includes a plurality of protruded portions and a coupling portion which is thinner than the protruded portions and which couples the protruded portions.