Polyimide Face Seal Fitting for Reusable High-Pressure Sealing
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Solution Overview
Problem
Face seal fittings face challenges with elastomeric seals that are susceptible to explosive decompression and non-volatile residue, metallic crush seals that are single-use due to galling and limited reuse, and metallic compression seals that are prone to leaks from over/under torque, necessitating a solution for reliable and reusable sealing.
Innovation Solution
A face seal fitting system utilizing a polyimide sealing component that undergoes both plastic and elastic deformation stages, securely seated within a counter bore, allowing for repeated connection and disconnection without replacement, and maintaining sealing integrity under high pressures and cleanliness standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastomeric sealing components are used to facilitate face seal formation, then sealing capability is improved, but susceptibility to explosive decompression and non-volatile residue increases
Solution Approach 1:
The patent changes the material parameter from elastomeric to polyimide, which fundamentally alters the sealing mechanism. Polyimide operates through elastic deformation and recovery rather than plastic deformation, eliminating explosive decompression susceptibility and non-volatile residue while maintaining sealing capability under various pressure conditions
Solution Approach 2:
The sealing component is formed as a composite structure combining polyimide material with specific geometric features including a deformation zone and engagement zones. This composite approach integrates material properties with structural design to achieve both sealing effectiveness and resistance to harmful factors
2Reliability
If metallic crush sealing components are used to facilitate face seal formation, then sealing capability is improved, but reusability deteriorates due to galling and plastic deformation
Solution Approach 1:
The patent changes the deformation parameter from plastic (metallic crush) to elastic (polyimide). The polyimide sealing component undergoes elastic deformation during compression and recovers its original shape upon decompression, enabling repeated connection and disconnection cycles without galling or permanent damage, thus achieving both sealing capability and reusability
Solution Approach 2:
The patent inverts the traditional approach by making the sealing component reusable rather than disposable. The polyimide material and its elastic deformation characteristics allow the sealing component to withstand multiple compression cycles without degradation, eliminating the need for replacement after single use
3Reliability
If metallic compression sealing components are used to facilitate face seal formation, then sealing capability is improved, but susceptibility to sealing surface galling and leaks increases
Solution Approach 1:
The patent changes the material parameter from metallic to polyimide, which fundamentally alters the interaction with sealing surfaces. Polyimide provides a compliant sealing surface that distributes contact pressure evenly, preventing galling and reducing the risk of leaks from over or under torque conditions while maintaining effective sealing
Solution Approach 2:
The polyimide sealing component functions as a flexible element that can conform to the sealing surfaces. This flexibility allows the seal to accommodate minor surface irregularities and maintain sealing effectiveness without transmitting excessive localized stresses that would cause galling on rigid metallic surfaces
4Reliability
If polyimide sealing component undergoes plastic deformation to form face seal, then sealing capability is improved, but torque requirements increase
Solution Approach 1:
The patent changes the deformation mode from plastic to elastic, which fundamentally reduces torque requirements. Elastic deformation in polyimide occurs at lower stress levels compared to plastic deformation in metals, and the material's high elongation at break allows achieving sealing pressures with significantly reduced compression forces and corresponding torque
Solution Approach 2:
The patent applies local quality by creating a specific deformation zone within the polyimide sealing component that is optimized for elastic deformation. This localized design concentrates the sealing action in a specific region, reducing the overall force and torque required to achieve effective sealing compared to uniform compression approaches
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 polyimide sealing component enables reliable, reusable face seals with reduced torque requirements, preventing leaks and non-volatile residue, suitable for high-pressure and cleanliness applications, and supports multiple connection cycles.
Implementation Method 1
the polyimide sealing component being configured to undergo elastic deformation to form a face seal
Implementation Method 2
the polyimide sealing component being configured to undergo plastic deformation to form a face seal
Data Source
AI summary
A face seal fitting operable to join first and second conduits together and to provide a face seal, the face seal fitting comprising a body comprising a fluid passageway, and a coupling portion having an end defining a mating face; a gland comprising a fluid passageway, and an end having a mating face operable to be seated against the mating face of the body; a polyimide sealing component configured to be situated between the body and the gland; and a compression nut fittable over the gland and coupleable to the body, the compression nut being operable, upon torqueing to achieve a threshold compression load, to cause the mating face of the gland to seat against the mating face of the body, and to compress and elastically deform the polyimide sealing component to be flush with the mating faces of the body and the gland to form a face seal.