Interlocking Holding Sealing Material for Exhaust Gas Purifying Apparatus
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Solution Overview
Problem
Conventional holding sealing materials face issues with displacement during rolling and fitting around exhaust gas treating units, leading to leakage and reduced durability due to inadequate handling and deformation, especially when multiple mats are used.
Innovation Solution
The holding sealing material is designed with specific corner cuts and shapes in the projected and recessed portions to ensure smooth fitting, even with slight displacement, and is rolled around the exhaust gas treating unit such that the recessed portion is brought close to the member to be wrapped, allowing the projected portion to fit seamlessly into the recessed portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple mats are combined to increase basic weight and thickness for better heat retention and repulsive force, then heat-retention properties and holding strength are improved, but displacement between mats during rolling and fitting occurs leading to leakage and reduced reliability
Solution Approach 1:
The holding sealing material is divided into multiple mats (first mat, second mat, third mat) with each mat having projected and recessed portions that interlock. This segmentation allows each mat to be independently positioned while maintaining overall structural integrity through the interlocking mechanism between adjacent mats.
Solution Approach 2:
Each mat is designed with asymmetric projected and recessed portions where the projected portion of one mat fits into the recessed portion of the adjacent mat. This asymmetric design creates a directional interlocking mechanism that prevents displacement during rolling and fitting operations, ensuring stable positioning of multiple mats relative to each other.
2Reliability
If the holding sealing material is designed with projected and recessed portions for fitting, then exhaust gas leakage is prevented, but displacement during rolling causes misalignment and overlapping leading to reduced sealing effectiveness
Solution Approach 1:
The projected and recessed portions are pre-formed on each mat during manufacturing, creating a guide mechanism that automatically aligns adjacent mats during the rolling process. This preliminary structural feature ensures that even if slight displacement occurs during handling, the mats will self-align as they are rolled around the exhaust gas treating unit.
Solution Approach 2:
The projected portion of one mat is designed to fit nested within the recessed portion of the adjacent mat, creating a nested configuration. This nesting mechanism ensures precise fitting and alignment of multiple mats while preventing displacement during rolling and installation, thereby maintaining sealing effectiveness.
3Temperature
If a thick holding sealing material is used to increase heat insulation between exhaust gas treating unit and casing, then heat-retention properties are improved, but the material becomes more prone to deformation and displacement during handling
Solution Approach 1:
The thick holding sealing material is segmented into multiple thinner mats rather than using a single thick layer. This segmentation reduces the flexibility and deformation tendency of each individual mat while achieving the same overall thickness and heat insulation performance through the stacked configuration of multiple mats with interlocking portions.
Solution Approach 2:
The asymmetric projected and recessed portions create a rigid interlocking structure between mats that resists deformation during handling. This asymmetric design provides mechanical stability to the stacked configuration, preventing the thick material from bending or displacing while maintaining the required heat insulation thickness.
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
An object of the present invention is to provide a holding sealing material (10) wherein projected and recessed portions (13a,13b) fit to each other and thus are prevented from overlapping even though slight displacement occurs due to deformation of the mat (11) when a single mat is rolled around a member to be wrapped or slight displacement between the mats occurs in the width direction when mats are rolled around a member to be wrapped. The holding sealing material (10) of the present invention comprises a mat (11) including an inorganic fibrous material. The mat (11) has a recessed portion (13b) at one of the short sides and a projected portion (13a) at the other of the short sides, whereby the projected and recessed portions should fit to each other when the mat is rolled around the periphery of a member to be wrapped. In the cross-sectional view, the projected portion (13a) is a quadrangle and the recessed portion (13b) is a gap between two quadrangles. At least one corner portion of the projected portion is cut out on the side of the member to be wrapped or another corner portion of the quadrangle of the projected or recessed portions (13a,13b) is cut out.