Ceramic-Sheathed Interfaces for Exhaust Aftertreatment Heat Protection
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Solution Overview
Problem
Existing exhaust gas aftertreatment devices face challenges in meeting Euro 7 emissions standards due to the high operating temperatures of electric interfaces, which exceed the thermal limits of conventional silicone insulation, necessitating improved thermal insulation solutions.
Innovation Solution
A heat-insulated interface arrangement comprising a ceramic material sheath that ensheathes an inner sheath, providing effective thermal insulation while maintaining a low installation space requirement, allowing the use of silicone insulation without degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silicone insulation is used for electric interfaces, then ease of manufacture and flexibility are improved, but temperature resistance deteriorates because silicone can only withstand up to 250°C while electric interfaces reach 350°C
Solution Approach 1:
The patent applies composite materials by combining ceramic material (for high-temperature resistance up to 350°C) with silicone material (for flexibility and ease of manufacture). The ceramic-insulated electric interface is subsequently covered with a silicone conduit insulation sheath, creating a composite structure that simultaneously achieves high-temperature resistance and ease of manufacture. This resolves the contradiction by integrating the thermal stability of ceramics with the manufacturing advantages of silicone.
2Temperature
If ceramic material is used for heat-insulating sheath, then temperature resistance is improved, but device complexity increases due to additional insulation layers
Solution Approach 1:
The patent implements the nesting principle by placing the ceramic-insulated electric interface inside a silicone conduit insulation sheath. The ceramic insulation is nested within the electric interface, which is then nested within the outer silicone sheath. This nested structure efficiently combines the high-temperature resistance of ceramic with the protective and insulating properties of silicone, achieving temperature resistance while managing device complexity through a systematic layered approach.
3Volume of stationary object
If conventional insulation is used, then installation space is minimized, but thermal insulation performance deteriorates allowing heat to affect surrounding components
Solution Approach 1:
The patent uses composite materials with ceramic providing superior thermal insulation performance and silicone providing flexible coverage. This composite structure achieves effective thermal insulation in a compact form factor, preventing heat from affecting surrounding components while maintaining minimal installation space. The combination allows the insulation system to be both space-efficient and thermally effective.
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 ceramic sheath maintains the electric interface temperature below 200°C, ensuring compliance with ADR and TÜV regulations, enabling the exhaust gas heating device to meet Euro 7 emissions standards.
Implementation Method 1
The heat-insulating sheath has a ceramic material or is formed from a ceramic material... the first electric interface being particularly well thermally insulated... this can be less than 200° C. due to the heat insulation on an outer side of the heat-insulating sheath
Data Source
AI summary
A heat-insulated interface arrangement for an exhaust gas aftertreatment device. The heat-insulated interface arrangement includes a first electric interface, an inner sheath which ensheathes the first electric interface, and a heat-insulating sheath which ensheathes the inner sheath. The heat-insulating sheath has a ceramic material or is formed from a ceramic material.