Canister Filter Layout for Vibration-Stable Adsorption Flow
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Solution Overview
Problem
The existing canister designs with multiple adsorption chambers face issues with mold removal during manufacturing, leading to divided cases, which can hinder the stable holding of filters due to vehicle vibrations and increase manufacturing costs.
Innovation Solution
A canister design featuring an outer and inner case with distinct adsorption chambers and a filter configuration where the second plate surface of the filter contacts the outer case and has open portions, allowing for different gas flow directions and stable filter holding, while the inner case is supported by a rib to distribute load and reduce vibration damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the canister is designed with multiple adsorption chambers having different gas flow directions, then the evaporated fuel adsorption and desorption efficiency is improved, but the filter cannot be stably held due to vehicle vibrations
Solution Approach 1:
The patent employs a nested structure where the inner case is placed inside the outer case. The filter is positioned between these nested cases, with its second plate surface contacting the outer case for stable support against vibrations, while its first plate surface contacts the second adsorbent to ensure functional integration. This nested arrangement allows the filter to be stably held without interfering with the multiple adsorption chambers' gas flow directions.
2Ease of manufacture
If the case is divided into multiple parts to accommodate the filter, then the filter can be installed, but the manufacturing cost increases
Solution Approach 1:
The patent divides the case into an outer case and an inner case, which are separate components that can be manufactured independently and then assembled. This segmentation allows the filter to be installed between the two cases without requiring the entire case to be divided into multiple complex parts. The outer case and inner case can be produced using standard molding processes, reducing manufacturing complexity and cost.
3Area of stationary object
If the filter is arranged to extend over multiple parts, then it can cover the adsorption chambers, but the filter holding is hindered by vehicle vibrations
Solution Approach 1:
The patent applies local quality by differentiating the support function of different parts of the filter. The first plate surface of the filter contacts the second adsorbent for functional integration, while the second plate surface contacts the outer case for mechanical support against vibrations. This localized differentiation of support functions allows the filter to maintain both adequate coverage area and vibration resistance.
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 enables stable filter holding and reduced manufacturing costs by ensuring a gas flow path and distributing the load from vibrations, promoting effective evaporated fuel adsorption and desorption.
Implementation Method 1
The canister adsorbs evaporated fuel to an adsorbent
Implementation Method 2
The canister also desorbs the fuel from the adsorbent and purges the fuel by suctioned air
Data Source
AI summary
A canister comprises an outer case, an inner case arranged inside the outer case, and a first adsorption chamber arranged in the inner case, a second adsorption chamber arranged in the inner case between the first adsorption chamber and an atmosphere port, a first adsorbent accommodated in the first adsorption chamber, a second adsorbent accommodated in the second adsorption chamber, and a plate-shaped filter arranged between the second adsorbent and the atmosphere port. The filter comprises a first plate surface in contact with the second adsorbent, a second plate surface in contact with the outer case, and a side surface connecting the first plate surface and the second plate surface to each other. At least one of the second plate surface or the side surface comprises an open portion spaced from both the inner case and the outer case.