Pipe Coupling Scraper Seal for Debris-Resistant Metal Sealing
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Solution Overview
Problem
Pipes connected with metal-to-metal seals face premature wear due to debris, such as abrasive materials, retained on the seal seat profiles, which reduces the utilizable life of the seal.
Innovation Solution
A seal assembly with integrated scraper rings that engage the tapered walls of the pipe couplings to remove debris before full mating, using materials like rubber, plastic, or polyurethane, snap-fit or glued onto the seal lips, ensuring debris removal without human interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal-to-metal seals are used for pipe connections, then sealing capability is achieved, but debris accumulation on seal seats causes premature wear and reduces seal life
Solution Approach 1:
The scraper rings perform debris removal action before the seal lips make full contact with the seal seat. By extending radially beyond the distal ends of the seal lips, the scrapers preemptively clean the sealing surfaces during the approach phase, preventing debris from interfering with the sealing process and thereby extending seal life
Solution Approach 2:
The scraper rings act as intermediary elements between the seal assembly and the seal seat. Made from elastomeric or polymeric materials, they mediate the interaction by removing harmful debris while allowing the metal seal lips to maintain their sealing function without direct contact with contaminants
2Productivity
If scraper rings extend radially beyond seal lips, then debris removal effectiveness is improved, but risk of damage to seal seat profile increases
Solution Approach 1:
The scraper rings are made from elastomeric or polymeric materials with different mechanical properties than metal seal lips. This material parameter change allows the scrapers to be softer and more compliant, enabling them to remove debris effectively while conforming to the seal seat profile and preventing damage through their flexible, non-abrasive contact
3Productivity
If multiple scraper rings are added to seal assembly, then debris removal capability is enhanced, but device complexity increases
Solution Approach 1:
The scraper rings are integrated with the seal lips by securing them to the distal ends, combining the sealing function and debris removal function into a single unified assembly. This merging approach enhances debris removal capability while avoiding the complexity of separate, independent scraper mechanisms
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
Enhances seal life and maintains sealing integrity by remotely removing debris, preventing damage from abrasive materials and ensuring uniform contact force during closure.
Implementation Method 1
A pair of inner scraper rings are secured to the pair of inner seal lips and including a first scraper edge that extends radially outward beyond a distal end of the inner seal lips. A pair of outer scraper rings are secured to the pair of outer seal lips and including a second scraper edge that extends radially inward beyond a distal end of the outer seal lips.
Data Source
AI summary
A seal assembly includes a pair of pipe couplings configured to be secured to a respective pair of pipes, each pipe coupling including an annular seal surface. An annular metal seal ring includes a pair of seal lips configured to engage a respective one of the annular seal surfaces of the pair of pipe couplings. A pair of scraper rings are secured to the pair of seal lips and include a scraper edge that extends radially beyond a distal end of the seal lips.