Molded 3D End Cone Insulator for Pollution Control
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Solution Overview
Problem
Current pollution control devices face challenges with insulation in the end cone region, including waste generation from cutting flat sheets, difficulty in fitting complex shapes, and non-uniform thickness leading to positioning issues, as well as insulation materials that are too stiff or prone to excessive shrinkage at high temperatures.
Innovation Solution
A molded three-dimensional end cone insulator made from ceramic fibers with low bulk shrinkage and a binder composition, which is self-supporting and non-intumescent, is used between inner and outer end cone housings, formed using an aqueous slurry and vacuum forming techniques to ensure seamless and flexible insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flat sheet insulation material is used in the end cone region, then installation is simple, but waste is generated from cutting and the fitment is poor for complex shapes
Solution Approach 1:
The patent changes the physical form of the insulation material from flat sheets to a molded three-dimensional configuration that matches the end cone region geometry. This transformation eliminates the need for cutting operations while maintaining installation simplicity, directly resolving the contradiction between ease of manufacture and material waste.
Solution Approach 2:
The insulation material transitions from a two-dimensional flat sheet to a three-dimensional molded form. This dimensional change allows the insulation to conform to the complex geometry of the end cone region without requiring cutting, thereby eliminating waste while preserving ease of installation as a single-piece component.
2Ease of manufacture
If flat sheet insulation material is used, then installation is straightforward, but positioning is difficult due to non-uniform thickness
Solution Approach 1:
The patent transforms the insulation material into a molded three-dimensional form with controlled and uniform thickness. This parameter change ensures consistent thermal insulation performance and precise positioning within the end cone region, eliminating the positioning difficulties associated with non-uniform flat sheet materials while maintaining installation simplicity.
Solution Approach 2:
By transitioning from a two-dimensional flat sheet to a three-dimensional molded component, the insulation material achieves uniform thickness throughout. This dimensional transformation enables precise positioning and proper fitment within the complex geometry of the end cone region, resolving the contradiction between ease of installation and positioning accuracy.
3Reliability
If conventional insulation material is used, then insulation is provided, but excessive shrinkage occurs at high temperatures
Solution Approach 1:
The patent employs a composite material system consisting of ceramic fibers combined with a binder containing inorganic binder (5-50 wt%), organic binder (45-95 wt%), and optional additives. This composite formulation provides excellent dimensional stability at high temperatures while maintaining effective insulation performance, resolving the contradiction between insulation reliability and compositional stability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the insulation material by incorporating specific ratios of inorganic and organic binders with ceramic fibers. This parameter optimization ensures the material maintains its dimensional stability and structural integrity at high temperatures, preventing excessive shrinkage while preserving insulation effectiveness.
4Strength
If insulation material is too stiff, then structural integrity is maintained, but fitting into complex shapes is difficult
Solution Approach 1:
The patent optimizes the mechanical property parameters of the insulation material through controlled formulation of ceramic fibers with binder systems. The material achieves an optimal balance between stiffness and flexibility, providing sufficient structural integrity while enabling easy fitting into the complex geometry of the end cone region without requiring forceful installation.
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 reduces waste, improves fitment, maintains shape integrity at high temperatures, and ensures effective insulation without breaking or disintegrating, enhancing the performance and durability of pollution control devices.
Implementation Method 1
ceramic fibers having a bulk shrinkage no greater than 10 percent using a Thermal Mechanical Analyzer test (i.e., a sample of the ceramic fibers, under a load of about 50 psi (345 kN/m2), is heated to 1000° C. and then cooled; the caliper of the sample at 750° C. during the heating step is compared to the caliper of the sample at 750° C. during the cooling step)
Implementation Method 2
vacuum forming a molded three-dimensional end cone insulator preform from the aqueous slurry on a permeable forming die
Implementation Method 3
a binder, with no greater than 50 weight percent on an inorganic binder, based on the weight of the ceramic fibers
Implementation Method 4
drying the preform to produce the molded three-dimensional end cone insulator
Data Source
AI summary
A molded three-dimensional insulator that is suitable for use in an end cone region of a pollution control device and a method of making the insulator are described. The insulator includes ceramic fibers that have a bulk shrinkage no greater than 10 weight percent. The ceramic fibers can contain alumina and silica and can be microcrystalline, crystalline, or a combination thereof.