EGR Cooler Housing Bead Design for Pulsating Pressure Stress
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Solution Overview
Problem
Exhaust Gas Re-circulation (EGR) coolers face stress and potential cracking due to pulsating pressure from engines, which reduces their service life and reliability.
Innovation Solution
The EGR cooler design incorporates a housing with a first fluid circuit, straight beads at the middle portion, and progressively continuous curved beads on the lateral walls, along with corner beads to mitigate stress from pulsating exhaust gas pressure, enhancing structural integrity and heat exchange efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If beads are provided in the housing to withstand pulsating pressure, then the housing can resist exhaust gas pressure to some extent, but stress still accumulates at corners and lateral walls leading to potential cracking
Solution Approach 1:
The patent applies curvature by providing beads (protrusions) at specific locations on the housing - at corners and along lateral walls. These curved structural features distribute and reduce stress concentrations that would otherwise lead to cracking under pulsating exhaust gas pressure, thereby improving housing reliability while maintaining strength
Solution Approach 2:
The patent implements local quality by placing beads at specific critical locations (corners and lateral walls) rather than uniformly across the housing. This targeted approach addresses stress concentration points locally, reducing stress at vulnerable areas while maintaining overall housing strength where needed
2Adaptability or versatility
If the housing is subjected to pulsating pressure from exhaust gas, then the EGR cooler can function with differential pressure, but stress leads to swelling and cracking of the housing
Solution Approach 1:
The beads provided in the housing utilize curved geometry to better withstand pulsating pressure. The rounded shapes of the beads distribute stress more effectively compared to sharp corners, allowing the housing to adapt to differential pressure while preventing stress-induced swelling and cracking
3Reliability
If conventional beads are provided in the housing, then some stress withstand capability is achieved, but stress at corners and lateral walls still reduces service life
Solution Approach 1:
By providing beads at corners and along lateral walls, the patent creates curved stress-distributing features that significantly reduce stress concentrations. This curvature-based design extends the service life of the housing by preventing stress-induced cracking that would otherwise occur with conventional flat or minimally-beaded designs
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 design effectively reduces stress on the housing by up to 10% compared to conventional EGR coolers, significantly increasing the fatigue life span of the EGR cooler by minimizing cracking and damage from differential pressure.
Implementation Method 1
The EGR cooler receives a part of exhaust gas from the engine of the vehicle and the exhaust gas rejects heat to the coolant flowing in the EGR cooler
Data Source
Figure 1
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Figure 2B
AI summary
An Exhaust Gas Re-circulation cooler for a vehicle is provided. The EGR cooler includes a housing having a first fluid circuit, a first bead, and curved beads. The housing further includes a middle portion formed on lateral walls of the housing, a first side portion and a second side portion, in which the first side portion and the second side portion are formed on adjacent sides of the middle portion. The first fluid circuit is formed in the housing to receive pulsating pressure of exhaust gas from an engine of a vehicle. The first bead formed at the middle portion of the housing and the curved beads formed on the first side portion and the second side portion of the lateral walls of the housing. Further, the first bead and the curved beads are formed in a longitudinal axis on the lateral walls of the housing.