EGR Heat Exchanger Casing for Exhaust Gas Flow Redirection
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Solution Overview
Problem
The existing powertrain depollution systems face challenges with increased congestion and pressure drops due to cramped engine compartments, leading to inefficient gas evacuation and reduced engine performance, as well as suboptimal gas circulation and cooling efficiency, which affects the effectiveness of pollution control and engine performance.
Innovation Solution
A burnt gas recirculation device with a tubular casing surrounding the connection endpiece of the heat exchanger, redirecting gas flows away from the tubular wall to prevent direct impact and heat transfer, while incorporating thermal insulation to enhance cooling efficiency and maintain compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the emissions control system components are installed to meet stringent emissions standards, then pollution control effectiveness is improved, but the engine compartment becomes congested causing increased pressure drops and reduced engine power
Solution Approach 1:
The patent combines the heat exchanger and catalyst into a single integrated assembly where the heat exchanger is positioned within the catalyst housing. This merging of functions reduces the total number of separate components, minimizes space occupation, and eliminates the protrusion problem that caused flow disruption, thereby maintaining engine power while meeting emissions standards.
Solution Approach 2:
The heat exchanger is nested within the catalyst housing structure, with the heat exchanger chamber positioned inside the catalyst housing. This nesting arrangement allows one component to occupy the space of another, reducing overall system volume and eliminating the need for separate mounting spaces that would increase pressure drops.
2Volume of stationary object
If the heat exchanger is mounted directly at the outlet of the emissions control system to reduce overall size, then the footprint is decreased, but the connector creates a protrusion that disrupts gas flow and creates high-temperature zones interfering with cooling efficiency
Solution Approach 1:
By integrating the heat exchanger into the catalyst housing structure, the patent eliminates the need for a separate connector protrusion. The heat exchanger outlet is directly formed as part of the catalyst housing, creating a smooth transition that maintains optimal gas flow patterns and prevents the formation of high-temperature zones that would interfere with cooling efficiency.
Solution Approach 2:
The patent applies different functional qualities to different regions of the integrated assembly. The heat exchanger section is designed with specific thermal characteristics for efficient heat transfer, while the surrounding catalyst housing provides structural support and flow management. This local differentiation of functional properties allows the system to achieve both compactness and cooling efficiency without compromising either aspect.
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 solution improves the cooling efficiency of burnt gases, reduces heat transfer, and maintains the compactness of the device, thereby enhancing the overall performance of the powertrain by ensuring effective gas recirculation and emission control.
Implementation Method 1
The envelope is capable of redirecting the flow of burnt gases in the opposite direction to the tubular wall
Implementation Method 2
incorporating thermal insulation to enhance cooling efficiency and maintain compactness
Implementation Method 3
a water-to-air heat exchanger in which the air (in this case, the exhaust gases) transfers heat to the water
Data Source
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AI summary
The invention relates to a device for recirculating (10) exhaust gas of a motor vehicle powertrain, comprising: a housing (101) for a system for removing exhaust gas pollutants (100); and a heat exchanger (102) exchanging heat between a cooling liquid and the exhaust gas and having a connection end fitting (11) with a tubular wall (12), which is driven into an outlet opening (108) of the housing of the pollutant removal system, characterised in that the device (10) comprises a casing (14) that can surround the tubular wall (12) of the connection end fitting.