Exhaust Insulation Pack with Axial Stabilizer
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Solution Overview
Problem
Conventional insulation techniques for exhaust aftertreatment system components fail to adequately seal against exhaust gas and provide sufficient compression, leading to reduced efficiency and increased manufacturing costs, as well as potential safety hazards due to excessive surface temperatures.
Innovation Solution
An insulation pack with a flexible fabric encapsulating insulation media and an axial stabilizer, which is radially compressible to form a seal and prevent fiber migration, while maintaining axial rigidity to facilitate easy installation and withstand high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If insulation is positioned within a fully enclosed compartment between external and internal walls, then the external surface temperature is reduced, but the compartment cannot be adequately sealed from exhaust gas exposure
Solution Approach 1:
The patent uses a flexible fabric encapsulating the insulation media to create a seal within the compartment. The fabric conforms to the compartment walls and can be compressed to achieve sealing, allowing the insulation to be positioned within the enclosed space while maintaining exhaust gas barrier integrity.
Solution Approach 2:
The patent changes the physical state and properties of the insulation by compressing it within the compartment. The compression alters the density and sealing characteristics of the insulation material, enabling it to form an effective seal against exhaust gas while maintaining its insulating function.
2Reliability
If fabric encapsulated insulation is exposed to hot exhaust gas, then the compartment can be sealed, but the insulation fibers may migrate and the insulation is not compressed adequately
Solution Approach 1:
The patent applies compression to the insulation pack before it is exposed to hot exhaust gas. This preliminary compression stabilizes the insulation fibers and prevents migration, while the flexible fabric encapsulation allows the pre-compressed insulation to form an effective seal when exposed to the exhaust gas environment.
Solution Approach 2:
The patent creates a composite structure with flexible fabric encapsulating the insulation media. This composite construction combines the sealing capability of the fabric with the insulating properties of the compressed insulation media, preventing fiber migration while maintaining seal integrity under hot exhaust gas exposure.
3Reliability
If the compartment is designed to compress the insulation, then adequate sealing is achieved, but rigid insulation cannot be installed as it will bunch up during feeding
Solution Approach 1:
The patent uses a flexible fabric encapsulation that allows the insulation pack to be dynamically compressed during installation and then maintain its compressed state for sealing. The flexibility enables the insulation to be fed into the compartment without bunching, while the subsequent compression achieves the required seal quality.
Solution Approach 2:
The flexible fabric shell encapsulating the insulation media allows the insulation pack to deform during installation, preventing bunching as it is fed into the compartment. The flexible shell maintains the insulation's shape during compression and enables adequate sealing once installed, combining ease of installation with reliable seal formation.
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 solution effectively seals exhaust aftertreatment components, reduces manufacturing costs, and enhances the efficiency of the insulation by preventing exhaust gas bypass and maintaining structural integrity under high temperatures.
Implementation Method 1
an insulation pack that is positioned within the space. The insulation pack includes insulation media
Implementation Method 2
The outer body applies a compressive force to the insulation pack to compress the insulation pack against the inner body
Implementation Method 3
an at least partially rigid member that has a rigidity greater than a rigidity of the insulation media and flexible fabric
Data Source
AI summary
According to one representative embodiment, an exhaust aftertreatment component that includes a housing that defines an interior cavity through which exhaust gas is flowable. The housing includes an inner body, an outer body, and a space defined between the inner and outer bodies. The component also includes an insulation pack that is positioned within the space. The insulation pack includes insulation media encapsulated by a flexible fabric. The insulation pack further includes an at least partially rigid member that has a rigidity greater than a rigidity of the insulation media and flexible fabric.