Semi-Metal Seal Structure With Integrated Centering Diameter
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Solution Overview
Problem
Semi-metallic gaskets face issues with corrosion and contamination due to gaps between the centering rim and flange faces, which can impair sealing performance, and require complex machining for the centering rim, increasing costs.
Innovation Solution
A semi-metallic seal design where the metal core forms the centering diameter, with grooved profiles having wave-like tips and varying heights, eliminating the need for a separate centering ring and reducing gaps, facilitating easy cleaning and reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a separate centering rim is used to center the gasket, then centering accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the centering function with the sealing body by integrating the centering rim directly into the gasket structure, eliminating the need for a separate centering component. The gasket body itself is designed with a specific outer diameter that provides both sealing and centering functions simultaneously.
Solution Approach 2:
The gasket body is designed to serve multiple functions: sealing the flange joint and providing centering capability. The outer diameter of the gasket body is specifically dimensioned to rest on the radially inner sides of the fastening bolts, enabling self-centering without additional components.
2Ease of operation
If gaps are left between the centering rim and flange faces for centering, then centering ease is improved, but contamination and corrosion increase
Solution Approach 1:
The patent eliminates the harmful gaps between the centering rim and flange faces by designing the gasket body to make direct contact with the flange sealing surfaces. This removes the source of contamination and corrosion while maintaining centering capability through the gasket's outer diameter dimensioning.
Solution Approach 2:
The patent converts the potential harm of gaps into a benefit by designing the gasket body with an outer diameter that provides both centering function and continuous contact with flange surfaces. The same structural feature that enables centering also eliminates contamination pathways.
3Manufacturing precision
If complex machining is applied to the centering rim, then centering precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the centering function with the sealing body, eliminating the need for separate complex machining of a centering rim. The gasket body is manufactured as a single integrated component with the necessary dimensional precision achieved through standard manufacturing processes.
4Ease of manufacture
If the gasket is designed with a standard flat profile, then manufacturing simplicity is improved, but sealing performance under varying pressure decreases
Solution Approach 1:
The patent applies different profile characteristics to different radial zones of the gasket body. The grooved profile with varying tip heights creates localized sealing zones that adapt to pressure variations, while the overall manufacturing process remains relatively simple.
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 design enhances sealing performance by minimizing contamination and corrosion, reduces manufacturing costs, and allows for easy reconditioning and reuse, while ensuring reliable centering during assembly.
Implementation Method 1
When the flanges are clamped, the material of the soft layer is pressed into the profile of the metal core of the semi-metallic gasket and simultaneously pressed against the sealing surfaces of the flanges under surface pressure, creating a tight seal.
Implementation Method 2
The tips of the grooves and the bases of the grooves between them form two parallel planes in the radial cross-sectional area. This is achieved by maintaining a constant height and depth relative to the central plane of the metal core across its surface. Consequently, after installation and clamping of the semi-metallic gasket, a nearly constant surface pressure is maintained, with identical pressure distribution between the soft material layer and the metal core across the entire radial extent of the profiled surface.
Data Source
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AI summary
Semi-metallic seal (5) with a dimensionally stable, annular, disc-shaped metal core (15), which has a groove-shaped profile (10, 11) with a plurality of points (16) on each of its lateral surfaces, wherein a soft material layer (8, 9) made of a material softer than the metal core (15) is provided on the groove-shaped profiles (10, 11), wherein the metal core (15) with its radial outer surface (17) forms a centering diameter of the semi-metallic seal (5), and the groove-shaped profiles (10, 11) on the lateral surfaces extend to the radial outer surface (17) of the metal core (15), and the successive points (16) of the groove-shaped profiles (10, 11) extending from a sealing section (12) towards the radial outer surface (17) form a plane (M) with respect to a central plane (M) the metal core (15) has decreasing height (H).