L-Shaped Lip-Ring Seal Thermal Expansion Management
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Solution Overview
Problem
Conventional L-sealing rings experience undesirable changes in profile when expanding due to temperature fluctuations, leading to reduced sealing effectiveness, increased pressure loss, and shorter service life, particularly in magneto-inductive flowmeters.
Innovation Solution
An L-sealing ring design with two legs forming an L-shape in cross-section, where the surface area of the cross-sectional area of the L-ring in a triangle is at most 60% of the triangle's area, and a connecting contour that allows the sealing ring to unfold from the inside to the outside, minimizing movement towards the axis of rotation, and using materials like EPDM or FKM for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing ring expands due to temperature increase, then the sealing pressure is maintained, but the profile change in contact with the medium increases leading to undesirable cleanability and pressure loss
Solution Approach 1:
The sealing ring is divided into two functional legs: a first leg that contacts the medium and a second leg that provides sealing pressure. This segmentation allows the second leg to expand radially for sealing while the first leg maintains a stable profile for cleanability and low pressure loss.
Solution Approach 2:
Different regions of the sealing ring are designed with different expansion characteristics. The cross-sectional area in the triangle is limited to at most 60% of the triangle area, creating local quality differences that direct expansion away from the medium-contact profile while maintaining sealing pressure where needed.
2Reliability
If the sealing ring expands perpendicular to the process connection surface, then sealing pressure is exerted, but repeated expansion and contraction damages the seal reducing service life
Solution Approach 1:
Instead of allowing the seal to expand directly over the edge of the liner or process connection (which causes damage), the invention inverts the expansion direction by confining it within the defined cross-sectional area limits. The expansion is directed radially outward within safe boundaries, preventing edge damage and extending service life.
3Reliability
If the L-sealing ring has a larger cross-sectional area, then sealing effectiveness is improved, but the movement towards the axis of rotation increases during thermal expansion
Solution Approach 1:
The invention optimizes the cross-sectional area parameter by limiting it to at most 60% of the triangle area. This parameter change balances two competing requirements: providing sufficient material volume for effective sealing while constraining the amount of radial expansion that would cause movement towards the axis of rotation during thermal cycles.
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 reduces the impact of thermal expansion on the sealing ring's profile, maintaining sealing effectiveness and extending its service life by minimizing movement towards the axis of rotation and maximizing sealing at the point of contact, while allowing for directed fluid discharge in case of failure.
Implementation Method 1
When installed, the known sealing rings can expand essentially perpendicularly to two surfaces during expansion, e.g. due to an increase in temperature.
Data Source
AI summary
Lip-ring seal (1) with two legs (2, 3) connected to one another in an L-shape by the body of the lip seal ring (1), wherein a first leg (2) is delimited from the exterior by an extent (4), wherein the first extent (4) is part of a generated surface about an axis of rotation (6) of the lip-ring seal (1), wherein the first leg (2) lies between the first extent (4) and the axis of rotation (6), and wherein a second leg (3) is delimited from the exterior by a second extent (5), which first and second extents (4, 5) are connected to one another via a connection contour, wherein an intersection point (7) of a first and a second straight line, respectively forming extensions of the first and second extents (4, 5), forms a vertex of a triangle, wherein the respective endpoints (8, 9) of the first and second extents (4, 5) form additional vertexes of said triangle, wherein the lip-ring seal (1) is designed in such a manner that the surface area of the cross-sectional area of the body of the lip-ring seal is at least 60% of the surface area of the triangle, wherein the surface of the lip-ring seal (1) in the triangle is non-concave, more particularly convex.