Mounting Support for SCR Heat Shield Buckling
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Solution Overview
Problem
Conventional exhaust aftertreatment systems for internal combustion engines, particularly those with selective catalytic reduction (SCR) systems, face issues with heat shield buckling due to clamping forces, which compromises the structural integrity and heat retention necessary for optimal emission reduction.
Innovation Solution
Incorporating a mounting support positioned between the heat shield and the housing of the SCR system to absorb and transmit clamping forces, thereby preventing buckling and maintaining structural integrity while ensuring optimal heat retention for catalytic conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If clamps are used to mount the SCR system on the structure, then the SCR system is securely fixed, but the heat shield buckles due to the clamping force
Solution Approach 1:
A mounting support is introduced as an intermediary component between the heat shield and the housing. The mounting support receives the clamping force from the clamp and transmits it to the housing, preventing the heat shield from buckling while maintaining secure mounting of the SCR system
2Loss of energy
If the heat shield is spaced apart from the housing, then conductive heat transfer is minimized, but the heat shield becomes more prone to buckling under clamping force
Solution Approach 1:
The mounting support serves as a mediator that enables the heat shield to be spaced from the housing for thermal isolation while providing the necessary structural support to prevent buckling under clamp loads
3Weight of moving object
If the heat shield thickness is reduced, then the heat shield is lighter and less intrusive, but it becomes more susceptible to buckling from clamp forces
Solution Approach 1:
The mounting support acts as a mediator that compensates for the reduced structural strength of the thinner heat shield by providing additional support at the mounting locations, allowing the heat shield to be lighter without sacrificing buckling resistance
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 effectively prevents heat shield buckling and maintains the desired temperature for efficient catalytic conversion, ensuring effective reduction of harmful emissions without requiring modifications to existing aftertreatment systems.
Implementation Method 1
The mounting support is configured to transmit a clamping force of the clamp on the heat shield to the housing to prevent buckling of the heat shield from the clamping force
Implementation Method 2
The heat shield is configured to prevent heat loss from the SCR system so that one or more catalysts of the SCR system can be maintained at a desired temperature
Implementation Method 3
a selective catalytic reduction (SCR) catalyst to convert NOx (NO and NO2 in some fraction) into harmless nitrogen gas (N2) and water vapor (H2O) in the presence of ammonia (NH3)
Data Source
AI summary
An aftertreatment system comprises a SCR system. The SCR system includes a housing having an inlet, an outlet and defining an internal volume. At least one catalyst can be positioned within the internal volume. A mounting support is positioned around at least a portion of a perimeter of the housing. A heat shield is positioned around the perimeter of the housing such that the housing is positioned substantially within the heat shield. A portion of the heat shield is disposed on and in contact with the mounting support. A clamp is positioned around a heat shield perimeter. The clamp is positioned on the portion of the heat shield disposed on and in contact with the mounting support. The mounting support is configured to transmit a clamping force of the clamp on the heat shield to the housing to prevent buckling of the heat shield from the clamping force.