Self-Retaining Pneumatic Seal for Groove Walking
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Solution Overview
Problem
Conventional pneumatically inflatable recessed seals with retention means, such as adhesives or mechanical elements, face challenges in maintaining proper positioning and sealing effectiveness over time due to 'walking' issues and difficulties in cleaning and servicing.
Innovation Solution
A pneumatically inflatable recessed seal design that is self-retaining without adhesives or mechanical retention, featuring a base with flange-like lateral extensions that compress to securely fit within a groove with straight, parallel walls, preventing incremental movement and allowing easy removal for cleaning and servicing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retention means (adhesives or mechanical elements) are provided in the groove, then the seal is retained in the groove, but the groove requires extra machining or additional labor and the seal becomes difficult to remove for cleaning
Solution Approach 1:
The retention function is extracted from the groove and transferred to the seal itself. The seal incorporates retention means (such as retention flanges or engagement features) that actively engage with the groove walls, eliminating the need for special groove configurations or adhesives. This allows the groove to maintain a simple, easily manufactured shape while the seal provides its own retention mechanism.
2Reliability
If the groove is configured with retention elements or flanges, then the seal is retained in the groove, but periodic cleaning becomes difficult and expensive
Solution Approach 1:
The retention function is extracted from the groove structure and placed on the seal. The groove returns to a simple, smooth configuration without retention elements, making it easily cleanable. The seal's retention features (such as flanges or engagement protrusions) provide the necessary holding force while allowing the groove to be maintained with basic cleaning procedures.
3Ease of manufacture
If friction retention is used with straight-sided groove, then the seal is retained without extra machining, but the seal tends to walk toward the open top of the groove over time
Solution Approach 1:
The seal is designed with self-retaining features that actively engage with the groove walls. The retention flanges or engagement features on the seal create mechanical interlocking with the groove, providing positive retention that prevents walking. The seal essentially installs and configures its own retention mechanism during installation, eliminating the need for external retention means in the groove.
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 ensures reliable self-retention and effective sealing without adhesives or special groove configurations, maintaining proper positioning through the use of flange-like extensions that resist movement, while facilitating easy installation and removal for maintenance.
Implementation Method 1
the seal is retained by friction with the side walls
Implementation Method 2
inflation of the sealing element causes it to expand and extend an outer surface portion out of the retaining groove
Data Source
AI summary
A self-retaining, recessed seal for reception in an open top groove, where the groove is neither configured for seal retention (e.g., convergent side walls), nor provided with seal retention features such as flanges, projections, etc. No adhesives are required, enabling the seal to be easily removed for cleaning, etc. The self-retaining seal has a bottom structure with lateral extensions, wider than the groove, with upwardly angled surfaces at the edges and portions that extend upward when compressed laterally by the walls of the groove. Side walls of the seal extend upward from the bottom structure and are slightly narrower than the groove, to avoid or minimize contact with the groove side walls when the seal is inflated. The configuration enables relatively easy installation of the seal but effectively prevents the seal from “walking” out of the groove over time, with repeated cycles of inflation and deflation.