Sealing Ring Guiding Arrangement Thermal Expansion Compensation
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Solution Overview
Problem
Existing sealing technologies in the process industry face challenges with media that conventional elastomers cannot withstand, leading to the need for complex designs and high manufacturing costs, particularly due to thermal expansion issues and material flow in fluoropolymer seals.
Innovation Solution
A sealing ring with a guiding arrangement comprising materials with different thermal expansion coefficients, where the effective axial thermal expansion is minimized by carefully selecting the radii and materials of the outer and inner guiding rings, ensuring the sealing ring remains effective across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoropolymer seals are used to withstand chemically resistant media, then chemical resistance is improved, but thermal expansion differences cause sealing failures
Solution Approach 1:
The sealing ring uses a composite structure combining a fluoropolymer sealing element (for chemical resistance) with guiding rings made of materials having different thermal expansion coefficients (ceramic or metal). This composite approach allows each material to contribute its advantageous properties while compensating for the thermal expansion differences through the guiding arrangement.
Solution Approach 2:
The invention changes the thermal expansion parameter by selecting materials with specific coefficients. The guiding rings are made of materials (ceramic or metal) whose thermal expansion coefficients differ from the fluoropolymer, creating a controlled differential expansion that prevents sealing failures while maintaining chemical resistance.
2Stress or pressure
If metal seals are used to generate required compressive pressures, then sealing pressure is improved, but large clamping forces are required
Solution Approach 1:
The sealing element uses a flexible fluoropolymer ring that can elastically prestress itself to generate the required sealing pressure. The flexibility of the polymer allows it to deform and create sufficient contact pressure without requiring large external clamping forces, unlike rigid metal seals.
3Device complexity
If elastomeric seals are used for simple designs, then device complexity is reduced, but they cannot withstand chemically resistant media
Solution Approach 1:
The sealing ring combines a fluoropolymer sealing element (providing chemical resistance) with a guiding arrangement (providing structural support). This composite structure maintains relative simplicity while achieving the required media resistance that simple elastomeric seals cannot provide.
4Reliability
If all devices are designed with complex construction to elastically prestress thermoplastic seals, then sealing reliability is improved, but manufacturing costs increase
Solution Approach 1:
The invention achieves reliable sealing by carefully selecting materials with specific thermal expansion coefficients for the guiding rings. This parameter-based approach (selecting ceramic or metal with appropriate expansion properties) provides a simpler and more cost-effective solution than complex prestressing mechanisms, while still ensuring sealing reliability across temperature variations.
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 solution effectively reduces thermal expansion effects, maintaining long-term sealing performance and reducing manufacturing costs by using a combination of materials like stainless steel and ceramic, ensuring the sealing ring remains effective and durable.
Implementation Method 1
an equatorial annular surface has an effective area thermal expansion coefficient β, which amounts to more than twice, especially not less than two and a half times, the first linear coefficient of thermal expansion, so that an effective axial coefficient of thermal expansion of the annular sealing element is less than the first linear coefficient of thermal expansion
Data Source
AI summary
A ring arrangement with a synthetic material sealing ring between an outer radial guiding ring and an inner radial guiding ring, wherein the outer guiding ring has a greater coefficient of thermal expansion than the inner guiding ring, so that an effective volume expansion coefficient of an annular gap between the guiding rings is greater than the volume expansion coefficient of the synthetic material of the synthetic material sealing ring. Through a large effective coefficient of thermal expansion for the annular gap volume, as achieved via different coefficients of expansion of the outer and inner guiding rings, fluctuation of the axial clamping forces of the synthetic material sealing ring can be limited.