Filtration Device Varying Passage Cross-Sectional Area
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Solution Overview
Problem
Filtration devices face issues with clogging due to the deposition of filtration objects on filters, which prevents the passage of liquid and hampers filtration efficiency.
Innovation Solution
A filtration device design featuring a passage member with a first passage section that increases in area towards the filter and a second passage section with a uniform area greater than the first, inducing convection on the upstream side to reduce clogging by slowing down the liquid flow and promoting circulation, thereby preventing deposition on the filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional filtration device with a uniform passage is used, then the structure is simple, but clogging occurs due to liquid flow deposition on the filter
Solution Approach 1:
The passage is divided into multiple sections with different cross-sectional areas: a first passage section with a first cross-sectional area, a second passage section with a second cross-sectional area greater than the first, and a third passage section with a third cross-sectional area. This segmentation creates varied flow conditions that prevent deposition and reduce clogging while maintaining structural feasibility
Solution Approach 2:
Different sections of the passage are given different local characteristics (varying cross-sectional areas) to optimize flow behavior at specific locations. The first section has a smaller area to maintain flow velocity, the second section has a larger area to reduce velocity and prevent deposition, and the third section transitions back, creating optimal local flow conditions throughout the passage
2Reliability
If the passage cross-sectional area is increased to reduce flow velocity and prevent deposition, then clogging is reduced, but the passage length increases
Solution Approach 1:
Instead of simply extending the passage length in one dimension, the invention varies the cross-sectional area in different sections, utilizing dimensional variation to control flow velocity and prevent deposition without proportionally increasing the overall passage length
3Reliability
If the passage cross-sectional area varies significantly, then flow circulation is improved and deposition is reduced, but manufacturing complexity increases
Solution Approach 1:
The invention changes the geometric parameter (cross-sectional area) of the passage in discrete steps rather than using complex continuous variations. This approach achieves the desired flow circulation and anti-deposition effects while maintaining relative manufacturing simplicity through standardized geometric transitions
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 design effectively reduces clogging by slowing down the liquid flow and promoting circulation, ensuring efficient filtration without significant deposition on the filter, thus maintaining the filtration process.
Implementation Method 1
inducing convection in a part of the passage on the upstream side of the filter of the filtration device
Data Source
AI summary
A filtration device that includes: a passage member defining a passage including an inlet and an outlet; and a filter disposed in the passage between the inlet and the outlet. The inlet has an inlet passage sectional area. The passage includes a first passage having a first passage sectional area that increases from the inlet toward the filter on an upstream side of the filter, and a second passage having a second passage sectional area that is uniform from the first passage toward the filter. The second passage sectional area is greater than the first passage sectional area, and a second passage length of the second passage is greater than a first passage length of the first passage.