Fuel Cell Vent Cover Gap Structure for Higher Air Intake
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Solution Overview
Problem
Conventional ventilation apparatuses for fuel cells face challenges in increasing the opening area of communication holes, making it difficult to sufficiently intake outside air into the fuel cell case.
Innovation Solution
A ventilation apparatus with a filter and a frame-shaped holding member attached to the fuel cell case, where a cover is attached to the holding member with a gap around the entire circumference, creating a larger flow path for air intake and discharge of fuel gas, and featuring a design that prevents foreign matter from reaching the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cover member is attached to the fuel cell case with a pressing member, then the filter is protected from foreign matter, but the opening area of communication holes is reduced making it difficult to sufficiently intake outside air
Solution Approach 1:
The cover is divided into multiple sections with through-holes formed at specific positions. This segmentation allows the cover to simultaneously protect the filter while providing multiple air intake paths, resolving the contradiction between protection and air intake area
Solution Approach 2:
The pressing member serves as an intermediary element that transmits fastening force while allowing the cover to maintain its protective function. The pressing member enables secure attachment of the cover to the holding member, ensuring the filter remains protected while the through-holes in the cover provide adequate air intake
2Reliability
If the cover is attached tightly to the holding member, then the filter is well protected, but air intake is insufficient
Solution Approach 1:
The cover is segmented with through-holes at specific positions, creating multiple air intake channels. This allows the cover to maintain tight attachment for filter protection while providing sufficient total opening area for air intake across multiple paths
Solution Approach 2:
Air intake is enabled through the thickness dimension of the cover via the through-holes. This three-dimensional approach allows the cover to provide both protection (by covering the filter surface) and air intake (through holes penetrating the cover body) simultaneously
Data Source
AI summary
A ventilation apparatus for a fuel cell including a fuel cell case accommodating a stacked body formed by stacking power generation cells and a ventilation unit attached to the fuel cell case so as to cover an opening provided at the fuel cell case, an internal space and an external space of the fuel cell case communicating through the opening. The ventilation unit includes a filter disposed facing the opening, a holding member formed in a frame shape and attached to the fuel cell case to hold a peripheral portion of the filter, and a cover attached to the holding member so as to cover an inside of the peripheral portion of the filter. The cover is attached to the holding member with a gap over an entire circumference of the cover between a peripheral portion of the cover and the holding member.