Catalytic Converter Module With Serial Catalyst Segments
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Solution Overview
Problem
Catalytic converters for internal combustion engines face challenges in fitting into limited vehicle spaces while maintaining low back pressure, especially in agricultural tractors with large engines, due to size constraints and uneven flow distribution.
Innovation Solution
A compact catalytic converter module with a serial arrangement of two catalyst units and a passive exhaust stream dividing element that splits the exhaust stream into two paths, allowing for a smaller cross-sectional area and even flow distribution, using a coaxial or offset arrangement to minimize space requirements and back pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the radial diameter of the catalyst is increased to reduce back pressure, then back pressure is reduced, but the catalytic converter becomes too large to fit into available space
Solution Approach 1:
The catalyst is divided into multiple segments arranged in series within the housing, with exhaust stream dividing elements creating multiple parallel flow paths through the catalyst segments. This segmentation allows the exhaust gas to flow through multiple catalyst sections simultaneously, reducing back pressure while maintaining a compact overall size that fits within available vehicle space.
2Stress or pressure
If the radial diameter of the catalyst is increased, then back pressure is reduced, but flow distribution becomes uneven with greater flow at the centre than around the periphery
Solution Approach 1:
The catalyst and flow paths are segmented into multiple sections with dividing elements that create separate flow channels. This segmentation distributes the exhaust stream more evenly across the catalyst surface area, preventing the uneven flow distribution that occurs with larger single-diameter catalysts where centre flow exceeds peripheral flow.
Solution Approach 2:
The dividing elements and catalyst segmentation create locally optimized flow paths that ensure uniform distribution of exhaust gas across different regions of the catalyst. Each segment is designed to handle a specific portion of the flow, ensuring that all areas of the catalyst receive appropriate gas flow for effective conversion.
3Volume of moving object
If the axial length of the catalyst is reduced to fit into limited space, then space availability is improved, but back pressure increases
Solution Approach 1:
Instead of extending the catalyst in the axial direction (length), the invention uses multiple catalyst segments arranged in series with radial or longitudinal positioning, connected through dividing elements that create parallel flow paths. This dimensional reorganization allows sufficient catalyst surface area to be achieved within a shorter axial length, reducing back pressure while maintaining compact size.
4Stress or pressure
If a larger diameter catalyst is used, then back pressure is reduced, but the catalytic converter package becomes too large to fit into available space
Solution Approach 1:
Multiple catalyst segments are nested or arranged in series within a single housing structure, with dividing elements creating concentric or sequential flow paths. This nesting arrangement allows the equivalent of a large-diameter catalyst to be achieved through multiple smaller segments occupying the same overall volume, reducing back pressure while maintaining a compact package size that fits within vehicle constraints.
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 enables the catalytic converter module to be conveniently fitted in limited spaces with reduced back pressure and improved flow distribution, maintaining efficiency and stability, while using simple and cost-effective components.
Implementation Method 1
a passive exhaust scream dividing element which divides and directs the exhaust stream into two mutually exclusive paths
Implementation Method 2
Catalytic converters have been employed to provide an environment within which chemical reactions can take place to convert harmful gases into less harmful substances
Data Source
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Figure 5~6
AI summary
A catalytic converter module (16) houses two catalyst units (26,36) which are geometrically arranged in a serial manner. An exhaust gas stream (X) is processed in two parallel sub- streams which follow respective paths: a first path (A) which passes through the first catalyst unit (26) and bypasses the second catalyst unit (36), and a second path (B) which bypasses the first catalyst unit (26) and passes through the second catalyst unit (36). This enables exploitation of a catalyst having an effective area larger than that of the module housing 17 thus allowing the module (16) to be incorporated conveniently into available volumes whilst maintaining a low back pressure.