PTFE Composite Seal Structure for Prolonged High-Temperature Sealing
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Solution Overview
Problem
Traditional seals fail to maintain effective sealing characteristics at high temperatures for prolonged periods, which is a challenge in industries requiring high-performance seals for applications like high-temperature engines.
Innovation Solution
A seal design featuring a jacket with a recess and an energizing element, where the jacket comprises a polymeric material with a filler material, such as boron-containing or titanium-containing materials, and the energizing element provides an outward biasing force to maintain sealing efficacy at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional seal materials are used, then the seal structure is simple and easy to manufacture, but the seal fails upon exposure to high temperatures for prolonged periods of time
Solution Approach 1:
The seal is constructed as a composite structure comprising an inner component made of a first material and an outer component made of a second material, where the materials are different. This composite approach allows each material to be optimized for specific high-temperature properties, enabling the seal to withstand prolonged exposure to high temperatures (e.g., 350°C) while maintaining structural integrity and sealing effectiveness.
Solution Approach 2:
Different portions of the seal are made from different materials tailored to their specific functional requirements. The inner component and outer component use different materials with complementary properties, allowing each region to perform optimally under high-temperature conditions. This local differentiation enables the seal to maintain reliability without requiring complex overall structural changes.
2Reliability
If traditional seal materials are used, then the manufacturing process is simple, but the seal loses effective sealing characteristics after prolonged high temperature exposure
Solution Approach 1:
The seal employs composite materials where the inner component is made of a first material and the outer component is made of a second material. This composition enables the seal to maintain effective sealing characteristics after prolonged exposure to high temperatures, as each material can be selected for its specific thermal stability and sealing properties, while the composite structure itself becomes the solution to the manufacturing challenge.
3Duration of action of stationary object
If the seal is designed to withstand high temperatures, then the seal lifespan is extended, but the material selection and construction become more complex
Solution Approach 1:
The seal is constructed with an inner component of a first material and an outer component of a second material, creating a composite structure that extends service life at high temperatures. The differentiated material composition allows each component to contribute specific high-temperature resistance properties, achieving extended durability through material diversity rather than structural complexity.
Solution Approach 2:
The seal implements local quality by assigning different materials to different components based on their specific functional needs and exposure conditions. The inner component uses a material optimized for its specific environment, while the outer component uses a different material suited to its conditions, thereby extending overall seal lifespan without requiring uniformly complex material construction throughout.
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 seal achieves an extended effective lifespan of at least 60,000 minutes at 350°C with a low leakage rate and minimal material degradation, maintaining sealing integrity and preventing fluid ingress or egress across the annulus.
Implementation Method 1
an energizing element disposed in the recess
Data Source
AI summary
A seal comprising a jacket comprising an annular body defining a central axis and a recess extending into the annular body concentric to the central axis, wherein the jacket comprises at least 30 wt % of a PTFE and at least 10 wt % of a filler material, and wherein the filler material comprises a boron-containing material, a nitrogen-containing material, a titanium-containing material, a silicon-containing material, a carbon fiber, a glass fiber, or a combination thereof; and an energizing element disposed in the recess.