Layered Kammprofile Gasket for Electrical Isolation Sealing
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Solution Overview
Problem
Existing Kammprofile gaskets face challenges in achieving good dielectric properties, mechanical properties, and thermal and chemical resistance, particularly in applications requiring electrical isolation and fire safety, such as pipelines with flammable or explosive materials.
Innovation Solution
A gasket design with a rigid core having serrated profiles and an inner insulating layer, typically made of polyimide or polyaryletherketone, between the core parts to reduce electrical conduction, combined with a compressible facing layer, enhances dielectric properties while maintaining mechanical and thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If graphite or exfoliated vermiculite is used as facing material, then thermal resistance and chemical resistance are improved, but dielectric properties deteriorate
Solution Approach 1:
The gasket is divided into multiple functional layers: a facing layer for thermal and chemical resistance, and an inner insulating layer for dielectric properties. This segmentation allows each layer to specialize in specific functions without compromising overall performance.
Solution Approach 2:
The gasket uses composite construction combining different materials (facing material such as graphite or vermiculite with insulating material such as PTFE or PEEK) to achieve properties that neither material could provide alone, specifically combining thermal/chemical resistance with dielectric properties.
2Ease of manufacture
If a single-layer facing is used, then manufacturing simplicity is improved, but the ability to provide both mechanical properties and dielectric properties deteriorates
Solution Approach 1:
The gasket is divided into multiple functional layers: a facing layer for thermal and chemical resistance, and an inner insulating layer for dielectric properties. This segmentation allows each layer to specialize in specific functions without compromising overall performance.
3Device complexity
If the core is made as a single piece, then structural simplicity is improved, but electrical insulation capability deteriorates
Solution Approach 1:
The core is divided into upper and lower parts with an insulating layer between them, segmenting the conductive path and enabling electrical insulation while maintaining structural integrity through the layered design.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the upper and lower core parts, preventing direct electrical contact while allowing the core to maintain its structural function. This intermediary layer enables electrical insulation without requiring complete redesign of the core structure.
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 provides effective electrical insulation and fire safety, withstanding high potential differences and temperatures, and ensuring reliable sealing under rigorous conditions.
Implementation Method 1
an inner insulating layer is located between the upper and lower parts so that it is operable to substantially reduce electrical conduction between the upper and lower parts
Implementation Method 2
During the sealing process the overlying softer sealing material of the compressible ring is forced into the gaps between serrations to improve sealing by inducing stress concentrations on the sealing surfaces
Implementation Method 3
The serrations also minimise lateral movement of the sealing material of the facing, while the metal core provides rigidity and blowout resistance
Data Source
Figure 1(a)~1(c)
Figure 1(d)~1(e)
Figure 2(a)~2(c)
AI summary
There is provided a gasket comprising a rigid core (2) defining an aperture (4). The core has a serrated profile (8) on at least one of its upper and lower outer surfaces and the core is divided into upper and lower parts (2a, 2b) each having a respective outer surface (6a, 6b) and also an inner surface (42, 44) opposite the outer surface. The gasket also includes an optional sealing facing (12, 14) on the at least one outer serrated profile surface, wherein an inner insulating layer (40) is located between the said upper and lower parts so that it is operable to substantially reduce electrical conduction between the said upper and lower parts. There is described a method of production of the gasket and use of the gasket.