Fuel Cell Humidifier Membrane Sealing Without Frame Parts
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Solution Overview
Problem
Existing humidifiers for fuel cells lack a simple and effective configuration to ensure fluid-tight sealing between stacked water-permeable membranes, leading to inefficiencies in moisture enrichment of airflow for electrochemical reactions.
Innovation Solution
A sealant is arranged at the edges of the membranes to form a fluid-tight seal between neighboring membranes, creating a self-supporting module that can be inserted into a housing, using materials like rubber or adhesive sealants with thixotropic properties to ensure sealing and structural integrity without additional framing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If frame parts are used to clamp and secure the membranes, then the membranes are held in place, but the device complexity increases due to additional framing components
Solution Approach 1:
The patent combines the sealing function and the structural support function into a single integrated sealant component. The sealant is applied at the edges of the membranes and simultaneously provides both sealing and mechanical support, eliminating the need for separate frame parts and reducing device complexity while maintaining stability.
Solution Approach 2:
The sealant serves multiple functions: it seals the flow spaces between membranes, provides mechanical support to the membranes, and acts as a structural element of the stacked unit. This multi-functionality replaces what would otherwise require separate frame components, resolving the contradiction between stability and complexity.
2Strength
If additional spacers and frames are used to support the membranes, then structural integrity is maintained, but the manufacturing complexity and assembly steps increase
Solution Approach 1:
The sealant integrates multiple structural roles that would traditionally require separate spacers and frames. By applying the sealant directly at the membrane edges, it simultaneously provides support, spacing, and structural integrity, significantly simplifying the manufacturing process and reducing the number of assembly steps.
Solution Approach 2:
The sealant is applied in a manner where it self-supports the membranes and creates the necessary structural integrity without requiring additional supporting components. The sealant itself becomes the structural element, eliminating the need for separate spacers and frames, thereby improving ease of manufacture.
3Device complexity
If sealant is applied to provide inherent stiffness, then additional framing is eliminated, but the sealant material requirements become more stringent
Solution Approach 1:
The patent specifies particular parameter ranges for the sealant material, including viscosity between 10 and 10,000 Pa·s and elongation at break between 5% and 500%, to ensure the sealant provides sufficient inherent stiffness and reliability. By controlling these material parameters, the sealant can replace framing structures while maintaining the necessary mechanical performance.
Solution Approach 2:
The sealant is designed as a composite material system that combines sealing properties with structural stiffness. The material composition and formulation are optimized to provide both sealing effectiveness and the mechanical strength needed to replace traditional framing structures, resolving the contradiction between simplified structure and material reliability.
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 solution effectively enriches airflow with moisture for fuel cells by preventing air leakage and providing structural support, allowing for efficient water exchange between high and low moisture airflows, thus ensuring consistent moisture levels for electrochemical reactions.
Implementation Method 1
a sealant, forming part of the stacked unit, is arranged, wherein the sealant closes or seals a flow space between neighboring membranes in a fluid-tight way
Implementation Method 2
Water molecules from the flow of humid air penetrate through the membrane to the dry airflow which is thereby enriched with moisture
Implementation Method 3
exclusively a water exchange from an airflow with higher moisture contents to an airflow with lower moisture contents takes place
Data Source
AI summary
A humidifier for a fuel cell has a stacked unit of several water-permeable membranes which are parallel to each other and are arranged spaced apart form each other. On the edges of the membranes, a sealant is applied which closes a flow space between neighboring membranes fluid-tightly and serves as a spacer.