Evaporated Fuel Adsorber Structure for Thermal Gap Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The formation of gaps between the inner surface of the case and the outer surface of the adsorbent in evaporated fuel treatment devices due to thermal expansion can reduce the adsorption capacity and cause displacement of the adsorbent, leading to decreased efficiency.
Innovation Solution
Incorporating an elastic member between the inner and outer cases to inhibit the formation of gaps by compressing radially inward and surrounding the adsorbent, along with matching thermal expansion coefficients and specific dimensions to minimize ventilation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the case expands due to heat, then the case volume increases, but a gap forms between the inner surface of the case and the outer surface of the adsorbent
Solution Approach 1:
The patent applies thermal expansion principle by designing the inner case with a thermal expansion coefficient equal to or greater than the outer case, ensuring that the inner case expands at least as much as the outer case when heated, thereby preventing gap formation between the case inner surface and adsorbent outer surface
Solution Approach 2:
The elastic member acts as an intermediary between the inner case and outer case, filling the space between them and maintaining contact pressure on the adsorbent to prevent gap formation during thermal expansion
2Reliability
If the adsorbent is held tightly to prevent gap formation, then adsorption capacity is maintained, but ventilation resistance increases
Solution Approach 1:
The patent applies local quality principle by making the adsorbent length shorter than its equivalent diameter only in specific regions where ventilation is critical, while maintaining sufficient contact with the case in other regions to prevent gaps, thus achieving local optimization of both seal quality and flow properties
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
The elastic member effectively inhibits gap formation, maintaining adsorption capacity and preventing adsorbent displacement, thereby enhancing the efficiency of the evaporated fuel treatment device.
Implementation Method 1
an elastic member disposed between an outer surface of the inner case and an inner surface of the outer case, in a state where the elastic member is compressed by the outer case in a radially inward direction
Implementation Method 2
The adsorbent is in a form of a mass. The adsorbent is configured to adsorb evaporated fuel
Implementation Method 3
The inner case has a tubular shape. The inner case is configured to hold the adsorbent in a state where at least a portion of the adsorbent is disposed inside the inner case
Data Source
AI summary
An evaporated fuel treatment device includes an adsorbent, an inner case, an outer case, and an elastic member. The adsorbent is in the form of a mass. The adsorbent is configured to adsorb evaporated fuel. The inner case has a tubular shape. The inner case is configured to hold the adsorbent in a state where at least a portion of the adsorbent is disposed inside the inner case. The outer case houses the adsorbent and the inner case. The elastic member is disposed between an outer surface of the inner case and an inner surface of the outer case. The elastic member surrounds both the inner case and the adsorbent in circumferential directions of the inner case.