Holding Sealer With Ditch Structures For Exhaust Gas Processing
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Solution Overview
Problem
Existing exhaust gas processing devices face challenges in preventing breakage of honeycomb structures due to compression stress, especially when using exhaust gas processing bodies with thin cell walls and low isostatic strength, as the surface pressure from holding sealers can exceed the isostatic strength, leading to damage.
Innovation Solution
A holding sealer with ditch-shaped structures on its surface is used, which can deform to scatter compression stress, reducing the direct pressure on the exhaust gas processing body, thereby preventing breakage. The ditch-shaped structures are formed by notch lines and can be constructed using a needling process, and may include inorganic and organic binders for enhanced binding and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a holding sealer is used to protect the exhaust gas processing body, then the exhaust gas processing body is protected from breakage and leakage, but the surface pressure from the holding sealer can exceed the isostatic strength, causing damage to the honeycomb structure
Solution Approach 1:
The holding sealer is segmented into multiple layers with different orientations. The first holding sealer is wound in a first direction, and the second holding sealer is wound in a second direction different from the first direction. This segmentation distributes the surface pressure from the holding sealers across different orientations, preventing concentration of stress on any single plane and thereby protecting the honeycomb structure from exceeding its isostatic strength.
Solution Approach 2:
Different layers of the holding sealer are positioned with specific orientations relative to the honeycomb structure. The first holding sealer is arranged so its winding direction is substantially parallel to the longitudinal direction of the exhaust gas processing body, while the second holding sealer is arranged with its winding direction substantially perpendicular to the longitudinal direction. This local quality arrangement ensures that pressure is distributed uniformly across the honeycomb cells rather than concentrated in one direction.
2Reliability
If the holding sealer is wound tightly to ensure retention, then the holding sealer maintains position and prevents falling off, but the compression stress may damage the exhaust gas processing body with thin cell walls
Solution Approach 1:
The holding mechanism is divided into multiple layers: a first holding sealer wound in a first direction and a second holding sealer wound in a second direction. This segmentation allows each layer to contribute differently to retention and stress distribution, ensuring that tight winding provides retention while the multi-directional arrangement prevents excessive compression stress on any single plane of the thin-walled honeycomb structure.
Solution Approach 2:
The first holding sealer is wound around the exhaust gas processing body before the second holding sealer is applied. This preliminary action establishes a baseline layer that provides initial retention while preparing the surface for the second layer, which is then wound in a different direction to provide additional retention without concentrating stress. This sequential preliminary action ensures both retention and stress distribution.
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 use of ditch-shaped structures on the holding sealer effectively disperses compression stress, preventing breakage of exhaust gas processing bodies with thin cell walls and low isostatic strength, even during assembly and operation, while maintaining retention and flexibility.
Implementation Method 1
the holding sealer can be deformed so as to fill the ditch-shaped structures when the compression stress is applied onto the holding sealer. Thereby, the compression stress which is applied to the exhaust gas processing body can be scattered.
Data Source
AI summary
The holding sealer comprises inorganic fibers, and the holding sealer has a first surface and a second surface, wherein the first surface has ditch-shaped structures.