Plugged Honeycomb Filtration for Even Exhaust Gas Flow
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Solution Overview
Problem
Existing exhaust gas purifying devices for direct injection type gasoline engines suffer from uneven gas flow and particulate matter deposition, leading to increased pressure loss and reduced purifying efficiency.
Innovation Solution
The device employs a honeycomb catalyst body and plugged honeycomb structure with controlled pressure loss distribution, using a can member to stabilize the honeycomb components and ensure even gas flow, and incorporates a cushion material and stoppers to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional plugged honeycomb structure is used to remove particulate matter, then the gas flow path is simplified, but the gas flow becomes uneven and pressure loss increases
Solution Approach 1:
The patent introduces guide ribs at specific locations (inflow side and outflow side) of the honeycomb structure to locally modify the gas flow characteristics. These guide ribs create localized flow guidance zones that distribute the gas flow more uniformly across the cross-section, preventing the uneven flow and high pressure loss that would otherwise occur in the simplified plugged honeycomb structure.
2Reliability
If the honeycomb structure dimensions are increased to improve purification performance, then the purifying efficiency increases, but the pressure loss increases
Solution Approach 1:
The patent adds guide ribs that extend in the axial direction (length dimension) of the honeycomb structure. These three-dimensional guide ribs create flow guidance channels that distribute gas flow uniformly across the cross-section while maintaining a compact overall structure. This dimensional approach allows the honeycomb structure to achieve high purifying efficiency without proportionally increasing pressure loss.
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 uniform gas flow and efficient particulate matter trapping, stabilizing purifying efficiency and reducing pressure loss, enabling effective exhaust gas purification.
Implementation Method 1
the particulate matter is trapped by the partition walls and deposited thereon
Implementation Method 2
a three-way catalyst is loaded
Data Source
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AI summary
There is disclosed an exhaust gas purifying device in which an exhaust gas emitted from a direct injection type gasoline engine evenly flows into an end face of a plugged honeycomb structure and which is capable of efficiently removing a particulate matter. An exhaust gas purifying device 1 includes a honeycomb catalyst body 10, a plugged honeycomb structure 20 and a can member 30 to receive therein the honeycomb catalyst body 10 and the plugged honeycomb structure 20, and the plugged honeycomb structure 20 disposed at a position on a downstream side of the honeycomb catalyst body 10 is designed so that a pressure loss in an end face central region of at least one of a second inflow side end face 21 and a second outflow side end face 22 of a second honeycomb substrate 25 is larger than a pressure loss of an end face circumferential region positioned around the end face central region.