Exhaust Elbow Mounting Area for SCR Dosing Module

Solution Overview

Problem

Existing exhaust system mounting solutions for dosing modules in SCR systems lead to increased heat transfer and potential overheating, as well as deposit formation due to the use of additional metallic components and welding, which can result in inefficient reductant evaporation and mixing.

Innovation Solution

An integrated exhaust elbow component with a mounting area that minimizes material usage and eliminates the need for welding, featuring a boss with an opening for reductant dosing and convective cooling legs to reduce heat transfer and prevent deposit formation, ensuring the dosing module is securely attached while maintaining efficient reductant mixing and evaporation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional mounting solutions with additional metallic components and welding are used, then the dosing module can be securely attached, but heat transfer to the dosing module increases causing overheating

Engineering Contradiction:

Improvemounting securityVSAvoiddosing module temperature

Core Design Contradiction:

StrengthVSTemperature

Solution Approach 1:

The mounting area is integrated directly into the exhaust elbow component, eliminating separate mounting brackets or plates. The boss structure is formed as part of the elbow itself, reducing the number of metallic components and welding joints that would conduct heat to the dosing module.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The boss structure with its opening acts as an intermediary between the hot exhaust elbow and the dosing module. The opening allows exhaust gases to flow through, creating a thermal barrier that reduces heat transfer to the mounted dosing module while still providing secure mechanical attachment.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If traditional mounting solutions are used, then the dosing module can be attached, but deposit formation occurs due to heat and welding

Engineering Contradiction:

Improvemounting securityVSAvoidreductant deposit formation

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The mounting area is integrated directly into the exhaust elbow component, eliminating separate mounting brackets or plates. The boss structure is formed as part of the elbow itself, reducing the number of metallic components and welding joints that would conduct heat to the dosing module.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The boss structure with its opening acts as an intermediary between the hot exhaust elbow and the dosing module. The opening allows exhaust gases to flow through, creating a thermal barrier that reduces heat transfer to the mounted dosing module while still providing secure mechanical attachment.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If additional metallic components and welding are used for mounting, then secure attachment is achieved, but reductant evaporation and mixing efficiency decreases

Engineering Contradiction:

Improvemounting securityVSAvoidreductant evaporation and mixing efficiency

Core Design Contradiction:

StrengthVSProductivity

Solution Approach 1:

The mounting area is integrated directly into the exhaust elbow component, eliminating separate mounting brackets or plates. The boss structure is formed as part of the elbow itself, reducing the number of metallic components and welding joints that would conduct heat to the dosing module.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The boss structure with its opening acts as an intermediary between the hot exhaust elbow and the dosing module. The opening allows exhaust gases to flow through, creating a thermal barrier that reduces heat transfer to the mounted dosing module while still providing secure mechanical attachment.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 reduces heat transfer to the dosing module, prevents reductant deposit formation, and enhances reductant mixing uniformity by using an integrated mounting area with convective cooling, thereby improving the efficiency and reliability of the SCR system.

Implementation Method 1

The mounting area may be configured to limit the heat transfer from the elbow component to the dosing module via the mounting area. That is, the mounting area may be configured to reduce heat flux to the dosing module and/or increase convective cooling to atmosphere.

Methodology Applied

Scientific EffectConvective cooling: Convection

Data Source

PatentUS9896981B2Exhaust elbow component with integrated mount

Publication Date: 2018.02.20 CUMMINS EMISSION SOLUTIONS INC

AI summary

An exhaust elbow component may be located upstream of a decomposition reactor pipe and/or may be integrated with decomposition reactor pipe. The exhaust elbow component includes a mounting area for mounting a dosing module to the exhaust elbow component. The mounting area may be configured to limit the heat transfer from the elbow component to the dosing module via the mounting area. The mounting area may include a boss and one or more mounting legs. The one or more legs and/or the boss may have a surface area for convective cooling of the mounting area. The boss may include an opening through an exterior wall of the exhaust elbow component through which an injection tip of the dosing module may dose reductant into an interior chamber of the exhaust elbow. A central axis of the opening may be substantially coaxial with a central axis of the exhaust gas outlet.