Exhaust Flange Shielding Apron Thermal Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Exhaust system flange connections face significant thermal challenges due to high thermal loads, especially when thinner and simpler materials are used, exacerbated by the presence of a wastegate valve generating a concentrated exhaust gas jet, leading to reduced service life.
Innovation Solution
Incorporating a shielding apron within the flange connection, designed with higher-quality materials and a thin wall thickness, to act as a heat shield and protect the transitional region from direct hot gas exposure, distributing heat and reducing thermal stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If thinner and simpler materials are used for the flange connection, then costs and weight are reduced, but thermal stability and service life deteriorate
Solution Approach 1:
The flange connection is divided into two distinct components: a thin-walled flange (3) made of lighter material and a separate shielding apron (14) made of heat-resistant material. This segmentation allows each component to be optimized for its specific function - the flange for weight reduction and the shielding apron for thermal protection - thereby resolving the contradiction between weight reduction and thermal stability.
Solution Approach 2:
The shielding apron (14) acts as an intermediary protective layer between the hot exhaust gas and the flange connection components. This intermediate element absorbs and distributes the thermal load, protecting the thinner flange material from direct thermal exposure and extending the service life of the entire connection system.
2Ease of manufacture
If thinner and simpler materials are used for the flange connection, then manufacturing costs are reduced, but thermal stability and service life deteriorate
Solution Approach 1:
The flange connection is divided into two distinct components: a thin-walled flange (3) made of lighter material and a separate shielding apron (14) made of heat-resistant material. This segmentation allows each component to be optimized for its specific function - the flange for weight reduction and the shielding apron for thermal protection - thereby resolving the contradiction between weight reduction and thermal stability.
Solution Approach 2:
The shielding apron (14) is designed as a separate, replaceable component that can be easily manufactured from cost-effective heat-resistant materials. If thermal degradation occurs, only the shielding apron needs replacement rather than the entire flange connection, reducing overall maintenance costs and improving economic reliability.
3Power
If a wastegate valve is equipped with concentrated exhaust gas jet, then engine performance is improved, but thermal load on flange connection intensifies
Solution Approach 1:
The concentrated exhaust gas jet from the wastegate valve, which originally represents a harmful thermal concentration, is redirected by the shielding apron (14) to flow along the outer surface of the exhaust pipe. This converts the harmful concentrated heat load into a beneficial surface flow that distributes thermal stress over a larger area, protecting the flange connection while maintaining engine performance.
Solution Approach 2:
The shielding apron (14) acts as an intermediary protective layer between the hot exhaust gas and the flange connection components. This intermediate element absorbs and distributes the thermal load, protecting the thinner flange material from direct thermal exposure and extending the service life of the entire connection system.
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 shielding apron enhances thermal stability and service life by effectively protecting the flange connection from thermal overload, improving heat dissipation and reducing the risk of thermal stresses, while maintaining a lightweight and cost-effective design.
Implementation Method 1
the shielding apron acts like a heat shield and accordingly protects the transitional region between the flange and the corresponding component
Implementation Method 2
The shielding apron can for example better distribute over a large area locally limited hot gas admissions, so called hot spots, which reduces thermal stresses
Data Source
AI summary
The present invention relates to an exhaust system for an internal combustion engine, more preferably of a motor vehicle, with an exhaust gas turbine, with an exhaust pipe, whose inlet is fluidically connected with an outlet of the exhaust gas turbine, with a flange connection for connecting the exhaust gas turbine with the exhaust pipe which comprises a flange fastened to the exhaust pipe and attached to the exhaust gas turbine, and with a shielding apron which is so arranged and/or incorporated in the flange connection that in the operation of the exhaust system it protects a transition region between the flange and the exhaust pipe from direct admission of exhaust gas.