Flat Compression Gasket With Fixation Lip for Gas Leak Control
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Solution Overview
Problem
Existing compression sealing gaskets in gas-insulated high or medium voltage apparatuses suffer from gas permeability and displacement issues, leading to increased leakage rates and premature failure, particularly with new insulating gases like g3, which are more susceptible to leakage and pose environmental and maintenance challenges.
Innovation Solution
A flat, T-shaped compression sealing gasket with a long and thin design and a fixation lip is used, made of elastomer material, which reduces gas permeability and securely fixes the gasket in place without the need for grease, allowing for easy assembly and operation in any orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional elastomeric gasket is used, then the gasket provides basic sealing and fills gaps, but the gasket shows high permeability to insulating gases under pressure
Solution Approach 1:
The gasket is made from a composite material combining an elastomeric base material with a permeability-reducing additive (such as metal powder, ceramic particles, or carbon black). This composite structure maintains the elasticity and gap-filling properties of the elastomer while significantly reducing gas permeability through the barrier effect of the additive particles, achieving both reliable sealing and low gas loss
2Loss of substance
If the gasket is made long and thin to reduce permeability, then gas leakage is reduced, but the gasket becomes difficult to mount and may displace
Solution Approach 1:
The gasket features a non-uniform cross-sectional profile with different regions having different thicknesses. The central sealing region is thinner to reduce permeability path, while the edges are thicker to provide structural stability and ease of mounting. This local quality variation allows the gasket to be both easy to install and effective at preventing gas leakage
3Loss of substance
If a complex multi-material gasket with insert is used, then permeability is reduced, but the device complexity and cost increase
Solution Approach 1:
Instead of using a multi-material construction with separate inserts, the invention uses a single composite material formulation where permeability-reducing additives are mixed into the elastomeric matrix. This homogeneous composite approach achieves the same permeability reduction as complex multi-material designs but with simpler manufacturing, single-piece construction, and lower cost
4Reliability
If grease is used to fix the gasket, then displacement is prevented, but the complexity and environmental concerns increase
Solution Approach 1:
The gasket incorporates self-fixing features directly into its structure, such as integrated retention lips, snap-fit edges, or interference-fit geometries that mechanically secure the gasket in place without requiring external grease or adhesive. The gasket's own structural features perform the fixation function, eliminating the need for additional mounting materials and simplifying 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 gasket achieves a leakage rate of less than 0.5% vol/year, meeting IEC standards, while preventing displacement and reducing complexity and costs, ensuring long-term durability and efficient sealing performance.
Implementation Method 1
The compression of the elastomeric gasket by the components produces an elastic deformation of the gasket filling all gaps or roughness of the tubular part on both sides
Implementation Method 2
a process of molecular penetration of the gas through the elastomeric material of the sealing gasket may occur, the process referred to as permeation
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
A compression sealing gasket (2) and a sealing system (1) of a gas-insulated portion of a high or medium voltage apparatus are disclosed. The sealing system (1) comprises two components (3, 4) fastened together, wherein each of the components (3, 4) comprises an assembly face (12, 13) that faces the assembly face (13, 12) of the other component (4, 3), and a compression sealing gasket (2) that is arranged and compressed axially between the assembly faces (12, 13) of the components (3, 4). The compression sealing gasket (2) comprises a ring-shaped, preferably annular main body (22) made of an elastomer material and having a main axis (A). The main body (22) has a generally flat planar configuration that extends perpendicular to the main axis (A) and comprises a radially outer side (23), a radially inner side (24) and end faces (26, 27) which delimit the main body (22) along the main axis (A) and connect the inner side (24) and the outer side (23). The gasket (2) further comprises a lip (28) projecting from the main body (22) outwards in axial direction parallel to the main axis (A) beyond one of the end faces (26, 27). The lip (28) is arranged in a distance to both the inner side (24) and the outer side (23) of the main body (22) and engages a ring-shaped fixation groove (21) formed in an assembly face (12, 13) of one of the components (3, 4). The fixation groove (21) receives the lip (28) of the gasket (2, 2', 2") with slight compression, thereby preventing movement or displacement of the gasket (2, 2', 2") during operation.