Fuel Cell Control Flap Sealing for Thermal and Tolerance Variations
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Solution Overview
Problem
Existing control flap assemblies in fuel cell systems face challenges in preventing gas leaks due to production tolerances and thermally induced dimensional changes, necessitating a structurally simple yet effective sealing mechanism.
Innovation Solution
A control flap assembly with a disk-like control flap body and resilient sealing material, such as EPDM, on the external peripheral region, ensuring a complete seal by interacting with a control flap seat, and a stable structure with sealing material bodies on both front faces and connecting portions, providing a one-piece monolithic configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid control flap body is used, then structural strength is improved, but sealing reliability deteriorates due to production tolerances and thermal dimensional changes
Solution Approach 1:
The control flap assembly combines rigid control flap body material (plastics or metal) with resilient sealing material (elastomer such as EPDM) to create a composite structure that provides both structural strength and sealing reliability. The rigid body provides mechanical strength while the elastomer sealing region compensates for dimensional variations.
Solution Approach 2:
The sealing region is constructed with resilient elastomer material that can deform flexibly to maintain sealing contact with the control flap seat, compensating for production tolerances and thermally induced dimensional changes in the rigid control flap body.
2Reliability
If sealing material is added to control flap, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The sealing material is integrated directly with the control flap body to form a unified component, eliminating the need for separate sealing elements and reducing overall device complexity while maintaining sealing reliability.
Solution Approach 2:
The control flap is constructed as a composite component with rigid body material and resilient sealing material combined in a single structure, providing both structural and sealing functions without requiring multiple separate parts.
3Manufacturing precision
If sealing material body is made in one piece, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The sealing material body is formed as a single monolithic piece, integrating all sealing functions into one component that ensures consistent sealing performance while simplifying the overall structure through consolidation.
Solution Approach 2:
The sealing material body is constructed as a single piece of elastomer material that is integrated with the control flap body, providing precise sealing contact through its uniform resilient properties without requiring multiple segmented components.
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 assembly achieves a substantially gas-tight seal, maintaining integrity despite production and thermal variations, ensuring reliable gas flow regulation and prevention of leaks.
Implementation Method 1
a sealing region bearing against the control flap seat in the closed position of the control flap is provided on the control flap, wherein the sealing region includes resilient sealing material, in particular elastomer material
Data Source
AI summary
A control flap assembly for a gas flow in a fuel cell system, in particular in a vehicle, includes a control flap housing providing a gas flow channel, and a control flap with a disk-like control flap body which can be adjusted in the control flap housing between a closed position preventing a gas flow through the gas flow channel and at least one open position opening up the gas flow channel for a throughflow. A control flap seat is provided on the control flap housing, and a sealing region bearing against the control flap seat in the closed position of the control flap is provided on the control flap. The sealing region includes resilient sealing material on an external peripheral region of the control flap body.