Rectangular Vacuum Valve Sealing Ring with Curved Edges
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Solution Overview
Problem
Existing vacuum valve sealing rings face challenges such as material stress, risk of damage, and complex production due to conical surfaces and thin cross sections, leading to potential irreparable damage to valve seats during operation.
Innovation Solution
A sealing ring with a rectangular cross section and diametrically opposite radii of curvature that maintain a neutral axis perpendicular to the movement direction, allowing for straight-line movement and reduced stress, eliminating the risk of tilting and damage to valve seats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conical sealing ring with thin cross section is used, then sealing effectiveness is improved, but the ring is subjected to high bending stresses and tilting during operation, causing it to snap or damage valve seats
Solution Approach 1:
The sealing ring incorporates radii of curvature at diametrically opposite edges instead of sharp corners, allowing the ring to conform to conical sealing surfaces while maintaining structural integrity. The curved edges distribute stresses more evenly and prevent stress concentration that would lead to snapping or valve seat damage.
2Ease of operation
If a double-conical sealing ring with constriction is used, then the rolling path is increased and inherent resistance is reduced, but very high shearing stresses act on the reduced cross section causing damage
Solution Approach 1:
The sealing ring features localized radii of curvature only at the sealing edges rather than a constricted cross section. This provides the necessary conformity to conical surfaces at the sealing points while maintaining a uniform, stronger cross section throughout the ring body, avoiding the high shearing stresses that would occur at constricted areas.
3Reliability
If conical surfaces with different radii are produced, then sealing engagement is improved, but production becomes very complicated requiring special tools and holding fixtures
Solution Approach 1:
The sealing ring employs radii of curvature at diametrically opposite edges with specific geometric relationships that enable sealing engagement while simplifying manufacturing. The asymmetric placement of radii at opposite edges allows the ring to conform to conical surfaces without requiring complex multi-radius conical geometries, reducing production complexity.
Data Source
AI summary
A vacuum valve with a seating ring having a generally rectangular cross section. With respect to rectangular edges lying diametrically opposite one another, radii of curvature are arranged in these edges, which radii of curvature come into sealing engagement with sealing seats arranged lying opposite one another on the housing side and the disk side. The sealing surfaces on the sealing seats have approximately the same cone angle. The sealing ring is easy to produce, has a small rolling path and there is no danger of damage to the valve seats by the sealing ring.