Canister Reduced Part Flow Stagnation
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Solution Overview
Problem
The existing canister design with a spatial chamber can lead to stagnant air flow in the main chamber due to decreased flow velocity, which may impair the efficiency of desorbing evaporated fuel.
Innovation Solution
The canister is configured with a main chamber and at least one reduced part near the inflow or outflow ports, which reduces the cross-sectional area of the main chamber, thereby improving fluid flow and preventing stagnation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a spatial chamber is added to decrease flow velocity and improve desorption efficiency, then contact time between adsorbent and purge air increases, but fluid flow in the main chamber becomes stagnant
Solution Approach 1:
The patent introduces a reduced part (tapered portion) at specific locations within the main chamber to create localized flow acceleration zones. This allows different regions of the main chamber to have different flow characteristics - the reduced part area creates higher velocity to prevent stagnation, while other areas maintain sufficient contact time for desorption, thus resolving the contradiction between flow velocity and contact time through spatial differentiation of flow properties
2Quantity of substance
If the main chamber has a large volume to accommodate adsorbent, then adsorption capacity increases, but fluid flow becomes stagnant due to reduced flow velocity
Solution Approach 1:
The reduced part creates a localized geometric feature within the large-volume main chamber that generates flow acceleration. This allows the main chamber to maintain its large volume for sufficient adsorbent capacity while the reduced part introduces localized high-velocity zones that prevent overall flow stagnation, resolving the contradiction between chamber volume and flow velocity
Solution Approach 2:
The reduced part (tapered portion) introduces a dimensional variation within the main chamber by creating a constricted cross-sectional area. This geometric modification in the spatial dimension creates flow acceleration zones that prevent stagnation throughout the large-volume chamber, allowing both large volume and adequate flow velocity to coexist
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 a smooth fluid flow inside the canister, enhancing the desorbing capacity of the evaporated fuel and improving the overall adsorbing capacity of the adsorbent.
Implementation Method 1
an adsorbent configured to adsorb an evaporated fuel is placed in the two or more chambers
Implementation Method 2
an outflow port configured to cause the evaporated fuel adsorbed on the adsorbent to flow out towards the engine by utilizing the atmosphere flowing in through the atmosphere port
Data Source
AI summary
A canister includes two or more chambers in which an adsorbent configured to adsorb an evaporated fuel is placed, a case, an inflow port, an atmosphere port, and outflow port. The case forms a main chamber that is one of the two or more chambers. The inflow port and the outflow port are provided to a first end of the main chamber. The case includes at least one reduced part that is a wall-like part forming an area in the main chamber in the vicinity of the first end. In the at least one reduced part, an area of a cross-section of the main chamber orthogonal to flow directions of a fluid is reduced towards the first end.