Segmented Catalyst Outer Cylinder for Exhaust Purification
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Solution Overview
Problem
Existing exhaust purification devices with a single catalyst main body throughout the outer cylinder are inefficient in exhaust gas purification due to useless protruding areas and susceptibility to heat during fixation, leading to inferior performance and potential heat-induced damage.
Innovation Solution
The device features multiple catalyst main bodies spaced within the outer cylinder, allowing for uniform gas purification and preventing heat from affecting the brazed connection, with the fixed face between them securely attached to the exhaust pipe, accommodating varying pipe shapes and enhancing purification efficiency by optimizing catalyst placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end portion of the outer cylinder is caused to protrude from the catalyst main body to prevent heat from affecting the brazed portion, then the reliability of the brazed connection is improved, but the purification performance deteriorates due to the creation of a useless area in the outer cylinder
Solution Approach 1:
The single catalyst main body is divided into multiple catalyst main bodies (first, second, and third catalyst main bodies) arranged along the axial direction. This segmentation eliminates the need for a protruding end portion, as the spaced arrangement of multiple segments allows the outer cylinder to be fully utilized for purification while maintaining structural integrity and protecting brazed connections from heat.
2Productivity
If a single catalyst main body is provided throughout the outer cylinder to maximize purification performance, then the purification performance is improved, but the catalyst main body becomes susceptible to heat during fixation to the exhaust pipe
Solution Approach 1:
The catalyst system is segmented into multiple catalyst main bodies positioned at different locations within the outer cylinder. This segmentation allows the fixation to occur at the outer cylinder rather than at the catalyst main body itself, protecting the catalyst from heat while maintaining full utilization of the outer cylinder length for purification.
3Manufacturing precision
If multiple catalyst main bodies are spaced apart to allow exhaust gas mixing and uniform purification, then the purification uniformity is improved, but the amount of catalyst material increases compared to a single continuous catalyst main body
Solution Approach 1:
The catalyst is divided into multiple segments that are spaced apart to allow exhaust gas mixing, which improves purification uniformity. The segments are positioned to maximize the use of the outer cylinder length, ensuring that the spacing does not result in significant loss of catalyst material while achieving the desired mixing and uniform purification effects.
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 maximizes the outer cylinder's length for purification, maintains performance comparable to a single catalyst main body setup while reducing catalyst material needs, and minimizes heat impact on the brazed connection, promoting efficient and cost-effective exhaust gas treatment.
Implementation Method 1
a catalyst is provided in an exhaust pipe in order to remove hydrocarbon (HC), nitrogen oxides (NOx), and the like included in exhaust gas
Implementation Method 2
The catalyst main body 103 is secured to an inner face of the outer cylinder 102 by brazing
Data Source
AI summary
Disclosed is an exhaust purification device in which an entire length of an outer cylinder of a catalyst can be used effectively for exhaust purification and it is possible to prevent heat in fixing of the catalyst to an exhaust pipe from affecting a connection portion between the outer cylinder and catalyst main bodies. A catalyst includes an outer cylinder and a plurality of catalyst main bodies provided in the outer cylinder in a state of being spaced each other in a direction of an axial center of the outer cylinder. An outer face of the outer cylinder positioned between the catalyst main bodies is a fixed face to be fixed to an inside of the exhaust pipe.