Dual-Wall Exhaust Header With Air-Gap Heat Shielding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional exhaust headers require bulky and aesthetically unpleasing thermal wraps for heat shielding, which add mass, occupy internal space, impede performance, and complicate manufacturing due to the need for complex welding and layered materials.
Innovation Solution
The integration of a radially offset outer wall forming an air gap within the exhaust header, combined with additive manufacturing for precise geometries and thermal syphoning, allows for efficient heat dissipation without the need for external thermal wraps, enhancing engine performance and aerodynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If thermal wraps are used for heat shielding, then heat protection is improved, but device complexity and mass increase
Solution Approach 1:
The patent merges the heat shielding function with the exhaust header structure itself by creating an integrated dual-wall design. The outer wall and inner wall are formed as a single integral structure, eliminating the need for separate thermal wraps while maintaining heat protection functionality.
Solution Approach 2:
The patent extracts the heat shielding material from the conventional thermal wrap form and integrates it directly into the exhaust header structure. The air gap between the inner and outer walls serves as the thermal insulation medium, removing the need for external wrapping materials.
2Object-affected harmful factors
If thermal wraps are used for heat shielding, then heat protection is improved, but weight increases
Solution Approach 1:
The patent applies thermal insulation locally where needed through the integrated air gap design. The air gap provides thermal insulation at the critical interface between the exhaust gases and surrounding components, without adding mass throughout the entire exhaust system.
Solution Approach 2:
The patent uses air as the thermal insulation medium in the gap between the inner and outer walls. This pneumatic insulation approach replaces solid thermal wrap materials, reducing weight while maintaining heat protection functionality.
3Object-affected harmful factors
If thermal wraps are used for heat shielding, then heat protection is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the heat shielding function with the exhaust header manufacturing process itself. The integrated dual-wall structure is formed in a single manufacturing operation, eliminating the separate step of installing thermal wraps and simplifying the overall manufacturing process.
Solution Approach 2:
The integrated dual-wall structure serves multiple functions simultaneously: it provides exhaust gas flow pathways, structural support, and thermal insulation. This multi-functionality reduces the number of separate components and manufacturing steps required.
4Object-affected harmful factors
If thermal wraps are used for heat shielding, then heat protection is improved, but volume increases
Solution Approach 1:
The patent transitions from adding thermal protection in the radial dimension (external wraps) to utilizing the existing radial structure of the exhaust header. The air gap is formed within the existing outer dimensions of the header, maintaining a compact overall volume while providing thermal insulation.
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 reduces the bulk and mass of exhaust headers, improves aerodynamics, and simplifies manufacturing by integrating heat shielding directly into the header design, effectively managing thermal radiation and enhancing engine performance through efficient heat transfer.
Implementation Method 1
the inner and outer walls defining an air gap therebetween to reduce radial outflow of heat
Implementation Method 2
the second channel being configured to receive an airflow at a second inlet adjacent one region of the body and to pass the airflow to a second outlet adjacent another region of the body
Data Source
AI summary
An exhaust header with an integrated heat shield is disclosed. In one aspect of the disclosure, the exhaust header comprises a body including an inner wall that defines a cavity through which exhaust gases can be routed. An outer wall is integrally formed with, and radially offset from, the inner wall to define an air gap through which an airflow can be received at an input of the exhaust header and passed along a periphery of the body to collect thermal radiation and route it through an outlet duct. In some embodiments, the exhaust header is coupled to a turbocharger, which itself is coupled to an exhaust outlet of the body and separately, the air gap for effecting an airflow about the turbocharger's perimeter. Further, in various embodiments, the exhaust header is additively manufactured to produce the integrated heat shield and other header components.