Compression Sealing Gasket With Low-Permeability Insert for Gas Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High voltage apparatuses with hollow components filled with insulating gas face significant gas leakage due to the permeability of conventional elastomer-based sealing gaskets, which exceeds the desired leakage rate of 0.5% vol/year as per IEC standards, especially with the use of new gas mixtures that have different leakage characteristics compared to traditional SF6 gas.
Innovation Solution
A compression sealing gasket featuring an annular elastomer main body with a lower permeability insert and surface treatments, such as coatings, to reduce gas migration, where the insert is made of materials like metals or thermoplastics, and is designed to enhance axial compression and extend along the entire periphery, further reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional elastomer-based sealing gasket is used, then the sealing gasket provides adequate sealing capability, but the gas leakage rate exceeds the desired rate of 0.5% vol/year
Solution Approach 1:
The sealing gasket is constructed as a composite structure combining an elastomer base material with a low-permeability insert made of PTFE, PFA, or other suitable materials. This composite design allows the gasket to maintain the elasticity and sealing capability of the elastomer while the insert provides a barrier layer that dramatically reduces gas permeability, achieving leakage rates below 0.5% vol/year
Solution Approach 2:
The low-permeability insert is nested within the elastomer gasket structure, with the insert positioned inside the gasket body. This nested configuration allows the insert to function as an internal barrier while being supported and contained by the outer elastomer structure, combining the advantages of both materials in a single integrated component
2Strength
If the gasket is made of elastomer material, then the gasket provides elastic deformation under compression improving tightness, but the elastomer shows high permeability to insulating gas
Solution Approach 1:
The gasket design applies local quality by introducing a low-permeability insert at the critical region where gas permeation occurs. The insert is positioned to cover the inner circumference of the gasket where compression contact with the tubular component occurs, providing localized barrier protection exactly where gas leakage is most likely to occur through the elastomer material
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 significantly decreases gas leakage rates, aligning with IEC standards by utilizing materials with lower permeability and surface treatments that act as barriers, effectively improving the sealing efficiency in high voltage gas-insulated apparatuses.
Implementation Method 1
the insert is made of a material having a lower gas permeability than the material of the main body
Implementation Method 2
The compression of the tubular parts produces an elastic deformation of the gasket, improving the tightness of the connection
Data Source
AI summary
The application concerns a compression sealing gasket including an annular main body made of an elastomer material and having a main axis A, the main body including an annular radially outer face and an annular radially inner face parallel and coaxial to each other, wherein the gasket includes an insert mounted on the inner face. The application also concerns a sealing system having the sealing gasket.