Arcuate Dust Filter Radial Flow Evaporated Fuel Treatment
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Solution Overview
Problem
Conventional dust filters in evaporated fuel treatment devices often have insufficient filtration effects and are prone to clogging, leading to increased air-flow resistance.
Innovation Solution
A dust filter with an arcuate-shaped filtration member that allows air to flow radially, increasing the filtration area and enabling easy removal of collected dust through backflow, and a backflow prevention device to prevent dust from re-depositing into the atmosphere introduction space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If air flows axially through a cylindrical filtration member, then the structure is simple, but the filtration area is limited and dust removal is difficult
Solution Approach 1:
The patent transitions from axial flow (one-dimensional) to radial flow (two-dimensional), where air enters from the outer circumferential surface and flows radially inward through the filtration member. This dimensional change dramatically increases the filtration area without proportionally increasing structural complexity, as the entire outer cylindrical surface becomes an active filtration surface.
Solution Approach 2:
The filtration member is designed with a curved cylindrical geometry where air flows radially through the curved surface. This curvature allows the filtration area to be defined by the outer circumferential surface area (π×D×L), enabling large filtration area with compact cylindrical structure.
2Reliability
If dust is collected on the filtration member, then filtration occurs, but the dust filter becomes clogged and air-flow resistance increases
Solution Approach 1:
The patent extracts collected dust from the filtration surface by introducing backflow air that moves in the opposite direction to normal airflow. This backflow detaches accumulated dust particles from the filtration member outer surface and transports them to the dust discharge port, preventing clogging and maintaining low air-flow resistance.
Solution Approach 2:
The dust removal system operates periodically by switching between normal filtration mode and dust discharge mode. During dust discharge mode, backflow is introduced to remove accumulated dust, then normal airflow resumes. This periodic action prevents continuous clogging while maintaining effective filtration during operation.
3Area of stationary object
If filtration area is increased by enlarging radial dimensions, then more dust can be filtered, but the device size increases
Solution Approach 1:
Instead of increasing radial thickness to gain filtration area, the patent utilizes the outer circumferential surface area by implementing radial flow. The filtration area becomes π×D×L (depending on outer diameter and length), allowing large filtration area with small radial thickness, thus maintaining compact device volume.
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 solution enhances filtration efficiency, prevents clogging, and reduces air-flow resistance by effectively collecting and removing dust from the filtration member, maintaining optimal airflow.
Implementation Method 1
a filtration member (44) for filtering air introduced to an atmosphere introduction path (26)
Data Source
AI summary
A dust filter of an evaporated fuel treatment device is taught that preferably include a filtration member for filtering air introduced to an atmosphere introduction path, and a casing receiving the filtration member therein. The dust filter being disposed on the atmosphere introduction path of the evaporated fuel treatment device. The filtration member has an arcuate shape in cross section, and wherein the filtration member is arranged and structured such that air flows in a radial direction thereof, so as to be filtered.