Spreader Bar Assembly for Sealing Catalyst in Aftertreatment Housing
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Solution Overview
Problem
Existing fixture assemblies for accessing and replacing catalysts in Diesel Oxidation Catalyst (DOC) housings are difficult to install, leading to increased downtime.
Innovation Solution
A spreader bar assembly with a scissor-type arrangement of arms and contact members is used to seal and support catalysts within the aftertreatment housing, featuring a sealing member that generates an opposing force to secure the catalysts in place, preventing axial and radial movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known fixture assemblies are used to access and replace catalysts, then catalysts can be secured within the housing, but installation becomes difficult and downtime increases
Solution Approach 1:
The fixture assembly is segmented into multiple independent arms that can be individually positioned and adjusted. Each arm can be independently manipulated to accommodate different catalyst sizes and shapes, allowing for easier installation and removal without requiring complex disassembly of a monolithic structure.
Solution Approach 2:
The fixture assembly incorporates dynamic elements including adjustable arms with movable contact points and flexible positioning mechanisms. These dynamic features allow the fixture to adapt its configuration during installation and servicing operations, reducing the time and difficulty of catalyst replacement while maintaining secure holding.
2Reliability
If complex fixture assemblies are used to secure catalysts, then catalysts can be firmly held, but device complexity increases
Solution Approach 1:
The complex fixture is divided into simpler modular arms and contact members that can be independently adjusted. This segmentation reduces overall complexity while maintaining holding stability, as each segment can be optimized for its specific function rather than requiring the entire assembly to be overly complex.
Solution Approach 2:
Different parts of the fixture assembly have specialized local characteristics - contact members are designed with specific geometries for gripping, arms have optimized stiffness distributions, and mounting points are positioned for maximum stability. This local quality optimization achieves reliable catalyst holding without requiring complex features throughout the entire assembly.
3Ease of operation
If simple fixture assemblies are used, then installation is easier, but catalyst securing reliability decreases
Solution Approach 1:
The fixture incorporates dynamic adjustment capabilities that allow simple, quick installation operations while maintaining secure catalyst holding. The arms and contact members can be easily positioned and locked into place, providing both ease of operation and reliable securing without requiring complex procedures.
Data Source
AI summary
A spreader bar assembly is provided. The spreader bar assembly includes a pair of arms disposed in a scissor type arrangement. The pair of arms defines an axis of rotation therebetween. The spreader bar assembly further includes a contact member attached to an end of each of the pair of arms. The contact member of the spreader assembly is configured to contact with a catalyst. The spreader assembly also includes a sealing member. The sealing member is provided in association with the contact member. The sealing member is disposed on a first side of each of the pair of arms such that on exerting a force on the sealing member on the first side of each of the pair of arms, an opposing force is generated on a second side of each of the pair of arms disposed substantially opposite the first side of each of the pair of arms.