Canister Adjustment Member Positioning for Uniform Gas Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In canisters with adsorbents, non-uniform gas flow velocity leads to reduced adsorption performance and breakthrough of fuel vapor, as the adjustment member's placement can cause misalignment and increase ventilation resistance.
Innovation Solution
A canister design with a target chamber featuring a first cylinder, a second cylinder, and a joining portion, where the positioning member allows precise placement of the adjustment member, and a buffer area with reduced rod-like member presence to maintain uniform flow velocity and prevent fuel vapor breakthrough.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the adjustment member is arranged in the chamber with adsorbents to reduce ventilation resistance, then gas flow is facilitated, but the uniformity of gas flow velocity decreases due to the adjustment member occupying space and causing misalignment
Solution Approach 1:
The chamber is divided into a first chamber and a second chamber with different cross-sectional areas. The adjustment member is specifically arranged in the second chamber (which has a larger cross-sectional area) rather than uniformly distributing it throughout. This segmentation allows the adjustment member to occupy space without significantly impacting the overall flow velocity uniformity in the narrower first chamber where adsorbents are located.
Solution Approach 2:
A positioning member is introduced as an intermediary component between the adjustment member and the chamber wall. This positioning member ensures precise placement of the adjustment member at predetermined positions, preventing misalignment and maintaining uniform gas flow velocity distribution through the adsorbent layer.
2Reliability
If the adjustment member is positioned to maintain uniform gas flow velocity, then adsorption performance is improved, but the ventilation resistance increases due to reduced flow paths
Solution Approach 1:
The chamber is segmented into two regions: a first chamber with smaller cross-sectional area where adsorbents are placed for uniform flow and high adsorption performance, and a second chamber with larger cross-sectional area where the adjustment member is positioned to facilitate gas flow and reduce ventilation resistance. This spatial segmentation allows both objectives to be achieved simultaneously in different zones.
Solution Approach 2:
The solution transitions from a single-chamber design to a multi-chamber design with varying cross-sectional areas along the gas flow direction. By utilizing the dimensional aspect of the chamber geometry (changing cross-sectional area from first to second chamber), the system achieves both uniform flow velocity in the adsorbent region and reduced ventilation resistance in the expansion region.
3Ease of manufacture
If the adjustment member is misaligned during assembly, then manufacturing is simpler, but the gas flow velocity uniformity deteriorates leading to fuel vapor breakthrough
Solution Approach 1:
The positioning member is designed with features that enable self-alignment and self-positioning of the adjustment member during assembly. The positioning member includes a cylindrical portion that fits into a corresponding cylindrical space in the chamber, and a flat surface that abuts against a protruding portion, automatically establishing the correct position without requiring complex alignment procedures or specialized assembly tools.
Solution Approach 2:
The positioning member serves as an intermediary component that mediates between the adjustment member and the chamber structure. It provides predetermined positioning features that guide the adjustment member into the correct position, ensuring manufacturing precision while maintaining assembly simplicity through intuitive fit-and-abut mechanisms.
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 stable placement of the adjustment member, reduces ventilation resistance, and effectively inhibits fuel vapor breakthrough while maintaining high adsorption performance by ensuring uniform gas flow velocity.
Implementation Method 1
The adsorbents are configured to adsorb the fuel vapor and disposed in each of the at least one chamber
Data Source
AI summary
A canister is provided. The canister includes an inflow port, adsorbents, an atmosphere port, an outflow port, and an adjustment member. The adjustment member includes rod-like members. The adjustment member includes a positioning member configured to enable positioning of the adjustment member in a target chamber by being insertable in a second cylinder and by not being insertable in a first cylinder. The second cylinder has a cylindrical shape, the cross sectional area of which is larger than a cross sectional area of the first cylinder.