Self-Regenerating Seal for High-Pressure Mixing Apparatus
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Solution Overview
Problem
High-pressure mixing apparatuses for polymeric components face issues with seal wear and leakage due to pressure imbalances and sticking forces, leading to frequent maintenance and production downtime, as conventional annular seals wear out quickly and fail to prevent leaks effectively.
Innovation Solution
A self-regenerating seal system is implemented, where an annular sealing element made of polymerizable resin is housed in a circular seat within the mixing chamber, allowing the reactive mixture to polymerize and fill worn areas, thereby automatically regenerating the seal, and is positioned in a cross hole of a bush connected to the delivery conduit for enhanced sealing between the mixing chamber and valve member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional annular sealing elements are used in the mixing chamber, then the apparatus can prevent leakage of polymeric components, but the seals wear out quickly due to pressure imbalances and reciprocating motion, requiring frequent maintenance
Solution Approach 1:
The sealing element material composition is changed from conventional non-reactive materials to polymerizable resin that undergoes chemical transformation. The resin is introduced in a liquid or pre-polymerized state and then polymerized in situ within the sealing groove, transforming its physical and chemical properties to create a durable, cross-linked sealing structure that resists wear from pressure imbalances and reciprocating motion
Solution Approach 2:
The conventional mechanical sealing approach using solid annular seals that wear through friction is replaced with a chemical polymerization process. The sealing element is formed in place through polymerization of the reactive mixture, eliminating the need for mechanical replacement of worn seals and creating a chemically bonded sealing structure
2Manufacturing precision
If the delivering conduit is made long to reduce turbulence, then mixing quality improves, but the cleaning member experiences excessive sticking forces and fatigue
Solution Approach 1:
The cleaning member is divided into multiple segments or sections along its length, allowing each segment to independently manage sticking forces. The cleaning member may include segmented cleaning surfaces or modular components that can be replaced individually, reducing the cumulative stress on the entire structure and preventing catastrophic failure
Solution Approach 2:
The cleaning member is designed with varying properties along its length, with different sections having different diameters, materials, or surface characteristics. This allows optimization of each section for specific functions - some sections for effective cleaning, others for reduced sticking - thereby managing the overall stress distribution and preventing excessive fatigue
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
This solution significantly extends the operational life of the mixing apparatus, reducing maintenance needs and preventing leaks, as the seal is continually regenerated by the reactive mixture, maintaining productivity and preventing contamination of the delivered mixture.
Implementation Method 1
worn and/or torn parts of the sealing element are automatically regenerated by the same reactive mixture that polymerizes into the worn and/or torn parts of the sealing element
Data Source
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AI summary
A method for forming a self-regenerating seal in a mixing chamber (11) of a high-pressure mixing apparatus (10) for polymeric components (A, B) suitable for providing a reactive mixture for a polymerisable resin. An annular sealing element (35, 40) is provided in a circular housing seat (17') inside the mixing chamber (11), in a sealing zone downstream the injection orifices (14C) for the polymeric components (A, B); worn and/or torn parts of the annular sealing element (35, 40) are automatically regenerated using the same reactive mixture (36) delivered during operation of the mixing apparatus (10). A high-pressure mixing apparatus (10) with self-regenerating sealing element (35, 40) is also claimed.