Humidifier Module Sealing for Thermal Expansion and Pressure
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Solution Overview
Problem
Existing humidifiers used in PEM fuel cells face challenges due to differing thermal expansion coefficients between the housing and the humidifier module, leading to mechanical stress and sealing issues under varying pressure conditions.
Innovation Solution
The humidifier module is secured within the housing through a form-fitting mechanism with recesses for the sealing compound, combined with a flexible sealing element that accommodates thermal expansion and pressure differences, ensuring stress-free fixation and effective separation of air flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the humidifier module is rigidly fixed in the housing, then the connection is secure, but mechanical stress occurs due to different thermal expansion coefficients
Solution Approach 1:
The patent employs a flexible sealing element (membrane) that can deform to accommodate thermal expansion differences between the housing and humidifier module. This membrane seal allows the module to move slightly with temperature changes while maintaining sealing integrity, preventing mechanical stress concentration that would occur with rigid fixation.
Solution Approach 2:
The patent changes the mechanical parameters of the connection by introducing a compliant sealing element that can change its deformation state. The sealing membrane transitions from a rigid seal to a flexible one that adapts to thermal expansion, allowing the system to tolerate dimensional changes without generating excessive stress.
2Reliability
If seals are arranged to separate air flows, then mass transfer is effective, but sealing becomes problematic under pressure differences
Solution Approach 1:
The flexible membrane seal can deform under pressure differences to maintain contact with the housing bore surface. This flexibility allows the seal to conform to the bore geometry even when pressure forces act on it, ensuring continuous sealing under varying pressure conditions up to 1.5 bar differential pressure.
Solution Approach 2:
The sealing solution transitions from a static seal to a dynamic one where the membrane can move and deform in response to pressure changes. This dynamic sealing capability allows the seal to maintain effectiveness under varying pressure conditions by actively adjusting its position and shape.
3Stability of the object's composition
If the humidifier module is tightly secured, then position stability is improved, but thermal expansion compensation is reduced
Solution Approach 1:
The flexible membrane seal provides a compliant connection that maintains positional stability through form-fit engagement in recesses while allowing controlled movement for thermal expansion. The membrane remains engaged with the housing bore, preventing excessive displacement, yet permits the necessary dimensional changes.
Solution Approach 2:
The humidifier module is nested within the housing with form-fit engagement in recesses, creating a stable positional relationship. The flexible membrane acts as an intermediary layer that allows the inner module to expand and contract while maintaining its nested position within the outer housing.
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
This configuration ensures secure, stress-free integration of the humidifier module, maintains effective sealing under pressure differences up to 1.5 bar, and allows for space-saving installation while accommodating thermal expansion, enhancing the humidifier's operational reliability and efficiency.
Implementation Method 1
The sealing compound extends into recesses 9 on the inner peripheral surfaces 8 into which the sealing compound extends
Implementation Method 2
The seal is provided by an additional sealing element, which encloses the humidifier module in a flexible, sealing manner
Implementation Method 3
The exchange bodies, often hollow fibers, are arranged inside the housing and are connected to one another on both end faces by a casting compound
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a humidifier (1), comprising a housing (2) for accommodating a humidifier module (3), wherein the humidifier module (3) comprises exchange bodies (4) fixed on both faces (5, 6) by a molded mass (7), wherein the humidifier module (3) is held in the housing (2) in a form-fitting manner on at least one face (5, 6).