Membrane Humidifier Assembly for Hermetic Potting Seals
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Solution Overview
Problem
Conventional membrane humidifiers for fuel cells face challenges in maintaining hermetic sealing in high-temperature/high-pressure/high-humidity environments due to high coefficients of thermal expansion and shrinkage of potting units, leading to air leaks and increased power consumption.
Innovation Solution
A membrane humidifier design featuring a mechanical assembly structure with a middle case, cap case, potting unit, and assembly member, including a projection portion and filling portion, which performs hermetic coupling between the cap case and potting unit, eliminating the need for chemical sealants and enhancing reworkability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealant is coated in the gap between the housing unit and the potting unit to prevent air leaks, then hermetic sealing is achieved, but the manufacturing process becomes more complex and time-consuming due to the additional coating and curing steps
Solution Approach 1:
The patent extracts the sealing function from the chemical sealant and transfers it to a mechanical structure. The cap case includes a projection portion that mechanically engages with the potting unit, creating a seal through physical interference rather than chemical adhesion. This eliminates the need for sealant coating and curing processes.
Solution Approach 2:
The patent replaces the chemical sealing system (sealant coating) with a mechanical sealing system. The projection portion on the cap case mechanically interfaces with the potting unit to prevent air leaks, substituting the chemical bonding mechanism with a mechanical interference fit.
2Reliability
If a sealant is coated in the gap between the housing unit and the potting unit, then hermetic sealing is achieved, but the production time increases due to the coating and curing process
Solution Approach 1:
The patent removes the time-consuming sealant coating and curing steps from the manufacturing process by implementing a mechanical sealing structure. The projection portion on the cap case provides immediate sealing upon assembly, eliminating the waiting time required for chemical sealants to cure.
Solution Approach 2:
The sealing structure is pre-formed as an integral part of the cap case design. The projection portion is built into the cap case during molding, so no additional sealing action is needed during assembly - the sealing capability is already prepared in advance.
3Reliability
If chemical sealants are used for sealing between the housing unit and potting unit, then hermetic sealing is achieved, but the process is difficult to automate for mass production
Solution Approach 1:
The patent replaces the chemical sealant application process with a mechanical sealing structure that is inherently suited for automated assembly. The projection portion on the cap case mechanically interfaces with the potting unit through simple positioning and engagement, which can be easily automated using robotic assembly systems.
Solution Approach 2:
The cap case is designed as a separate component with an integrated projection portion that mechanically seals against the potting unit. This segmentation allows each component to be manufactured independently and assembled automatically, with the sealing function built into the component geometry rather than requiring post-assembly chemical treatment.
4Reliability
If polyurethane/sealant coating is applied to prevent air leaks, then hermetic sealing is achieved, but the manufacturing complexity and work time increase
Solution Approach 1:
The patent extracts the sealing function from the polyurethane sealant coating process and embeds it directly into the cap case structure through the projection portion. This eliminates the need for separate sealant application steps, simplifying the manufacturing process while maintaining hermetic sealing.
Solution Approach 2:
The patent merges the sealing function with the structural function of the cap case. The projection portion serves both as a structural element of the cap case and as the sealing interface with the potting unit, combining multiple functions into a single integrated component.
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 design achieves hermetic sealing in high-temperature/high-pressure/high-humidity environments, reduces power consumption, and allows for efficient assembly and mass production by omitting the polyurethane/sealant coating process, while enabling easy replacement and reuse of defective cartridges.
Implementation Method 1
a hollow fiber membrane having large transmission area per unit volume is preferably used as the selective transmission membrane used in the humidification membrane method
Implementation Method 2
a projection portion extending from the inside of the cap case toward the edge of the potting unit, the projection portion being configured to perform hermetic coupling between the cap case and the potting unit
Data Source
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AI summary
A membrane humidifier for a fuel cell, of the present invention, comprises: a middle case in which a plurality of hollow fiber membranes are accommodated; a cap case coupled to the middle case; potting parts formed at the ends of the plurality of hollow fiber membranes; an assembly member disposed between the cap case and the end of the middle case so as to provide air tight coupling therebetween; and a protrusion part extending toward the edges of the potting parts from the inside of the cap case so as to provide air tight coupling between the cap case and the potting parts.