Elastic Seal Ring for Melted Plastic Leakage Control
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Solution Overview
Problem
Existing seal systems for melted or pasty plastics fail to effectively prevent leakage through interstices between cylindrical surfaces in apparatuses like molds and extruders, especially under high pressure and temperature conditions, and are complicated to construct with precise tolerances.
Innovation Solution
A seal system comprising a male and female body with a seal ring, where the seal ring is an open elastic ring with flat, parallel side surfaces, capable of sliding and designed to fit within a chamber defined by the cylindrical surfaces, made from materials like stainless steel or PTFE with reinforcing particles, to prevent leakage even with wide tolerances and varying thermal expansion materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cylindrical surfaces are constructed with extremely precise dimensional and geometric tolerances to prevent plastic leakage, then sealing effectiveness is improved, but construction complexity and manufacturing cost increase
Solution Approach 1:
The patent introduces a seal ring as an intermediary element between the male and female cylindrical bodies. This seal ring acts as a mediator that prevents plastic leakage without requiring the cylindrical surfaces themselves to have extremely precise tolerances. The seal ring compensates for dimensional variations and manufacturing imperfections, thereby achieving reliable sealing while simplifying the construction of the cylindrical surfaces.
2Reliability
If cylindrical surfaces are constructed with extremely precise dimensional and geometric tolerances to prevent plastic leakage, then sealing effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The seal ring serves as a cost-effective intermediary that eliminates the need for expensive precision machining of the cylindrical surfaces. By placing the sealing function in a separate, replaceable component, the main cylindrical bodies can be manufactured with standard tolerances, significantly reducing manufacturing costs while maintaining sealing effectiveness.
Solution Approach 2:
The seal ring is designed as a simpler, more economical component that can be manufactured at lower cost compared to precision-machined cylindrical surfaces. It serves as a sacrificial or replaceable element that protects the more expensive cylindrical bodies from wear and ensures continuous sealing performance without requiring high-precision manufacturing of the main components.
3Stress or pressure
If conventional seal systems are used under high pressure and temperature conditions, then sealing is attempted, but leakage occurs due to insufficient seal effect
Solution Approach 1:
The seal ring is designed with specific material properties and geometric parameters optimized for high pressure and temperature conditions. The cross-sectional shape, elasticity modulus, and material composition are carefully selected to maintain sealing effectiveness under extreme operating conditions, allowing the seal to deform appropriately to maintain contact pressure while resisting thermal expansion and compression.
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 system provides a reliable and cost-effective seal against leakage in critical conditions, ensuring effective sealing in high-pressure and high-temperature environments with minimal construction complexity.
Implementation Method 1
The aforesaid seal ring can include an open elastic ring
Data Source
AI summary
A seal system includes a male body and a female body that are slidable in relation to one another in an axial direction and between which an interstice is arranged. Plastics in pasty state pass through the interstice to a chamber partially defined by at least one of the aforementioned bodies. An elastic strip is arranged in the interstice to prevent leakage of the plastics.