Fire-Rated Isolation Washer Structure for Hot Flange Joints
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Solution Overview
Problem
Existing flat washers fail to effectively withstand high compressive loads, prevent galvanic corrosion, and maintain torque integrity when flange joints are exposed to extreme heat.
Innovation Solution
A washer design featuring an inner ring made of dielectric ceramic materials like zirconia toughened alumina and an outer ring of glass reinforced epoxy, with an interference fit, to distribute loads and prevent corrosion, while maintaining structural integrity under high temperature conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional flat washers are used, then the structure is simple and cost-effective, but they fail to withstand high compressive loads and maintain integrity under extreme heat
Solution Approach 1:
The washer is divided into two distinct rings: an inner ring made of dielectric ceramic material (such as zirconia toughened alumina) and an outer ring made of glass reinforced epoxy. This segmentation allows each ring to be optimized for specific functions - the inner ring provides compressive strength and thermal stability, while the outer ring provides structural support and load distribution.
Solution Approach 2:
The invention uses composite materials in both rings - the inner ring uses dielectric ceramic (a composite of zirconia and alumina) and the outer ring uses glass reinforced epoxy. These composite materials provide superior mechanical properties, thermal stability, and corrosion resistance compared to conventional single-material washers.
2Reliability
If conventional washers are used, then manufacturing is simple, but they cannot prevent galvanic corrosion between dissimilar metals
Solution Approach 1:
The dielectric ceramic inner ring acts as an intermediary barrier between dissimilar metals (such as steel flange and aluminum bolt), preventing galvanic corrosion by blocking electrical current flow. The ceramic material's dielectric properties eliminate the electrochemical cell formation that causes galvanic corrosion.
Solution Approach 2:
The dielectric ceramic material creates an electrically inert environment between dissimilar metals, preventing the flow of electrons that would otherwise cause galvanic corrosion. This inert barrier isolates the two metals from each other electrically.
3Stability of the object's composition
If conventional washers are used, then the design is straightforward, but they lose torque integrity when exposed to extreme heat
Solution Approach 1:
The invention changes the material parameters of the washer to withstand extreme temperatures. The dielectric ceramic inner ring maintains its mechanical properties and dimensional stability at high temperatures, preventing torque loss that would occur with conventional organic or metal washers.
Solution Approach 2:
The composite structure is designed to accommodate differential thermal expansion between the inner and outer rings, as well as between the washer and adjacent components. The ceramic inner ring has low thermal expansion, while the epoxy outer ring has higher expansion, creating a composite that maintains integrity through thermal cycles.
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 washer effectively withstands high compressive loads, prevents galvanic corrosion, and maintains torque integrity even under extreme heat exposure, ensuring the durability and reliability of flange joints.
Implementation Method 1
The inner ring is preferably made with materials having dielectric properties, particularly with respect to electrical insulation, where very little electric current flows through the material when the material is subjected to an electric field.
Implementation Method 2
Inner ring 11 and outer ring 12 are preferably fit together using an interference fit
Data Source
AI summary
A washer for protecting a flange. The washer is capable of withstanding high compression loads, protecting a flange plate from galvanic corrosion, and maintaining torque load when a flange joint is exposed to extreme heat. The washer has two primary components—an inner ring and an outer ring—that are preferably made of materials having dielectric properties, particularly with respect to electrical insulation. The inner ring and outer ring are preferably fit together using an interference fit.