Particulate Filter With Variable Channel Geometry
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Solution Overview
Problem
Conventional particulate filters face challenges such as pressure drop, reduced filtration efficiency, and increased weight and bulk due to the presence of plugs, which limit the filtration surface area and contribute to motor inefficiency and potential damage from excessive pressure.
Innovation Solution
A particulate filter design featuring channels with evolving polygonal geometries, such as hexadecagonal, dodecagonal, or octagonal sections, that close before reaching the exit face, eliminating the need for plugs and enhancing the open frontal area, thereby increasing filtration surface area and reducing pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plugs are used to close channel ends in conventional particulate filters, then channel sealing is achieved, but filtration surface area is reduced and pressure drop increases
Solution Approach 1:
The invention removes the plugs from the channel ends entirely. Instead of using separate plug components to seal channels, the channel walls themselves are designed to close at the ends through geometric convergence, eliminating the need for plugs and thereby maximizing the filtration surface area.
Solution Approach 2:
The invention transitions from a 2D cross-sectional view where plugs are needed to a 3D geometry where channel walls converge to closed ends. The channels have constant cross-section along their length but terminate with closed ends formed by the convergence of wall surfaces, creating a three-dimensional sealing structure without plugs.
2Reliability
If plugs are used to close channel ends in conventional particulate filters, then channel sealing is achieved, but pressure drop increases
Solution Approach 1:
By removing plugs entirely and using closed-end channel geometry, the invention eliminates the abrupt flow diversion and viscous friction caused by plugs, thereby reducing pressure drop while maintaining sealing through the convergent channel wall design.
3Device complexity
If channel cross-section is reduced to close channels, then plug material is eliminated, but channel flow capacity may be reduced
Solution Approach 1:
The invention maintains constant channel cross-section along the length to preserve flow capacity, while achieving closure in the third dimension through convergent wall surfaces that meet at the channel ends, forming closed ends without reducing the effective flow area through the channel body.
4Weight of stationary object
If filter size is reduced to minimize weight and cost, then material usage decreases, but filtration surface area may be insufficient
Solution Approach 1:
By eliminating plugs and using closed-end channel geometry, the invention maximizes the filtration surface area within the available filter volume, allowing for compact filter designs that maintain adequate filtration capacity while reducing weight and material costs.
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 improves particle capture efficiency, reduces pressure drop, and minimizes engine overconsumption and damage by maintaining optimal filtration performance while reducing the filter's size, weight, and material costs.
Implementation Method 1
a particulate filter for collecting particles from the exhaust gases of an internal combustion engine
Implementation Method 2
a body made of porous material... comprising a plurality of inlet and outlet channels... separated by common filtering walls suitable for allowing the exhaust gases to pass through
Implementation Method 3
The geometry of each input and output channel is not constant along the channel... such that, for each input and output channel: the perimeter of the channel section decreases continuously from the open end of the channel to the reference cross section... then increases continuously from said reference cross section to the closed end
Data Source
Figure 1A~2
Figure 3A~3D
Figure 3E~4
AI summary
The invention relates to a particulate filter for collecting particulate matter from the exhaust gases of an internal combustion engine, having a canal geometry that evolves along the entire length of the canal, such that: – the perimeter of the cross section of the canal decreases continuously from an open end (310) of the canal (370) as far as a reference cross section (350) of the canal, then increases continuously from the reference cross section as far as a closed end (360) of the canal, and – the surface area of the cross section of the canal decreases monotonously from the open end of the canal as far as the closed end. The closed ends are situated in the body of the filter near the outlet and inlet faces respectively for the inlet and outlet canals of the filter.