Exhaust Connection Funnel Thermal Insulation Design
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Solution Overview
Problem
The connection between components made of cast material and sheet metal in exhaust systems often experiences leaks due to differing thermal expansion properties, leading to durability issues.
Innovation Solution
An assembly unit design featuring a connection funnel with a pipe socket that extends into the pipe, providing thermal insulation by maintaining a distance from the inner wall, and a bracket arrangement that facilitates a gas-tight connection via a weld seam or soldered seam, ensuring reduced thermal load and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If components made of cast material and sheet metal material are connected by soldering or welding, then a permanent connection is achieved, but thermal expansion differences cause leaking in the connection area
Solution Approach 1:
The patent introduces an intermediary cooling channel system between the cast material component and sheet metal component. This cooling channel acts as a mediator that allows controlled thermal expansion and contraction, accommodating the differential thermal expansion between the two materials without causing connection failure or leaking.
Solution Approach 2:
The patent changes the thermal parameters by introducing cooling channels that actively manage temperature distribution. By controlling the temperature field through the cooling channels, the thermal expansion differences between cast material and sheet metal are reduced, preventing connection area leaking while maintaining the permanent soldered or welded connection.
2Device complexity
If the pipe socket is positioned close to the connection section, then structural compactness is achieved, but the connection section experiences high thermal load
Solution Approach 1:
The cooling channel serves as an intermediary thermal management system between the pipe socket and the connection section. It provides a controlled thermal pathway that protects the connection section from excessive thermal load while maintaining structural compactness, as the cooling channels can be integrated within the existing connection geometry.
Solution Approach 2:
The patent replaces passive thermal exposure with an active thermal management system. Instead of relying on natural heat dissipation, the cooling channels actively remove heat from the connection section, substituting the natural thermal field with a controlled cooling mechanism that maintains lower temperatures despite structural compactness.
3Temperature
If the pipe socket extends into the pipe interior and is spaced from the inner wall, then thermal insulation of the connection section is achieved, but the device complexity increases
Solution Approach 1:
The pipe socket is designed to serve multiple functions simultaneously: it provides structural support for the connection, creates thermal insulation by spacing from the inner wall, and incorporates cooling channels for active thermal management. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving the desired thermal insulation.
Solution Approach 2:
The patent merges the thermal insulation function with the structural connection function by designing the pipe socket to extend into the pipe interior and space itself from the inner wall. This integration combines what could be separate components into a unified structure, achieving thermal insulation without proportionally increasing device complexity.
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 the temperature of the connection section by up to 100°C, enhancing the durability and gas-tightness of the assembly unit, preventing leaks and maintaining performance across varying thermal conditions.
Implementation Method 1
the pipe socket acts as a thermal insulation with regard to the connection section, since hot exhaust gas guided in the pipe is guided through the pipe socket at a distance from the connection section
Implementation Method 2
an auxiliary agent such as solder or a weld seam is located, which fastens the pipe to the bracket of the connection funnel
Data Source
AI summary
An assembly unit 1 of an exhaust system has at least one and particularly two connection funnels 2 made of cast material and a pipe 3. The at least one connection funnel 2 has a pipe socket 21 and at least one bracket 22. The bracket 22 is arranged outside of the pipe socket 21. A connection section 31 of the pipe 3 is fastened to the bracket 22 of the at least one connection funnel. The pipe socket 21 extends beyond the connection section 31 of the pipe 3 into the interior of the pipe 3 and is spaced apart from an inner wall of the pipe 3 by at least the simple wall thickness of the pipe 3.