Fuel Cell Manifold Extrusion for Gastight Channel Sealing
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Solution Overview
Problem
Conventional fuel cell system bases face challenges in achieving reliable gastightness between fluid channels during manufacturing, requiring complex assembly with separate covers and molds.
Innovation Solution
A method involving extrusion of a thermoplastic parison into a mold with spaced cavities, where the parison walls are pressed against the mold to form gas-tight conduits, eliminating the need for separate covers by forming a single piece with sealed ducts and an intermediate zone, using materials with similar melting points for precise sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional molded parts with separate covers are used, then assembly is simplified, but gastightness between channels is compromised
Solution Approach 1:
The patent merges multiple separate components (molded part and cover) into a single integrated base component. The extrusion process creates a monolithic structure where fluid channels are sealed by the base itself, eliminating the need for separate covers and ensuring inherent gastightness without additional assembly steps.
Solution Approach 2:
The patent segments the fluid circulation system into distinct sealed channels within a single base component. The extrusion process creates multiple independent fluid pathways (anode inlet, anode outlet, cathode inlet, cathode outlet) that are gas-tightly separated by the base material, allowing complex fluid management in a unified structure.
2Ease of manufacture
If separate covers are used to seal channels, then manufacturing is simpler, but assembly complexity increases
Solution Approach 1:
The invention combines the functions of the molded part and the cover into a single extruded base component. This eliminates the need for separate cover manufacturing and assembly, reducing the total component count while maintaining manufacturing efficiency through the extrusion process.
Solution Approach 2:
The extruded base performs multiple functions simultaneously: it provides structural support, defines fluid channels, seals channels gas-tightly, and eliminates the need for separate covers. This multi-functionality reduces overall system complexity while maintaining ease of manufacture.
3Device complexity
If a single piece base is used, then assembly is simplified, but achieving gas-tight seals becomes difficult
Solution Approach 1:
The patent uses gas pressure during the extrusion process to ensure the parison walls conform perfectly to the mold cavities. By blowing gas inside the parison, the material is pressed against the mold surfaces, ensuring intimate contact and creating gas-tight seals between channels as the material solidifies.
Solution Approach 2:
The patent controls the temperature and pressure parameters during extrusion to achieve proper sealing. The thermoplastic material is heated to its melting point range, allowing it to flow and conform to the mold geometry, then cooled to solidify with precise dimensional tolerances that ensure gas-tight seals.
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 method simplifies the manufacturing process, ensuring strong seals and precise geometric tolerances between fluid channels, reducing the complexity of assembly and enhancing the reliability of the fuel cell system's fluid circulation.
Implementation Method 1
a gas is blown inside the parison (19) in each cavity, to press the parison walls against the mold in each cavity to form a conduit in each cavity
Implementation Method 2
The thermoplastic material is heated to its melting point
Implementation Method 3
extruding a parison of thermoplastic material comprising two opposite walls
Data Source
Figure 1~2
Figure 3~4e
Figure 5
AI summary
Method for manufacturing a fluid base for a fuel cell system: (a) a parison (19) of thermoplastic material is extruded, (b) the parison is placed in a mold (10a, 10b), (c) an intermediate zone is created in which the two walls of the parison are joined in a gas-tight manner, (d) a gas is blown inside the parison in each cavity of the mold, and (e) the mold is opened.