Refractory Component Locking Surface Design
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Solution Overview
Problem
Existing precast refractory shapes with flanges or protrusions do not effectively prevent separation or upward movement due to cracking above the flange, and tapered shapes are not suitable for all applications.
Innovation Solution
A precast refractory shape with a plurality of spaced-apart cavities on its outer surface, which are filled with refractory material to secure the shape within a surrounding refractory structure, eliminating the need for outward projections and ensuring fixed locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flange or protrusion is disposed around the lower end of a precast shape to lock it in place, then the precast shape is secured within the surrounding refractory material, but portions above the flange can separate and float upwardly if cracks develop in the refractory shape above the flange
Solution Approach 1:
The locking mechanism is segmented into multiple discrete cavities distributed along the outer surface of the precast shape, rather than relying on a single continuous flange. This segmentation ensures that cracking in one area does not compromise the entire locking mechanism, as other cavities remain intact and continue to prevent separation.
Solution Approach 2:
The locking mechanism transitions from a two-dimensional flange at the lower end to a three-dimensional distribution of cavities along the outer surface. This dimensional change allows the locking function to be distributed throughout a portion of the precast shape's length, preventing upward movement at multiple points simultaneously.
2Reliability
If a tapered shape is used to prevent separation of cracked shapes, then upward movement is prevented, but tapered shapes are not suitable in all applications
Solution Approach 1:
Instead of applying a global tapered shape to the entire precast form, the locking function is applied locally through discrete cavities at specific positions along the outer surface. This allows the majority of the precast shape to maintain its required geometric form while still providing locking capability where needed.
Solution Approach 2:
The cavity-based locking mechanism serves multiple functions: it prevents upward movement of cracked portions, maintains the structural integrity of the precast shape within surrounding refractory material, and accommodates various precast shape geometries without requiring tapered configurations.
3Reliability
If outward projecting flanges or projections are used to lock the precast shape, then the precast shape is secured in the surrounding refractory material, but the design complexity increases and not all applications can accommodate projections
Solution Approach 1:
The protruding flange element is extracted and replaced by recessed cavities. Instead of adding external locking features that extend outward, the locking mechanism is embedded within the precast shape's outer surface, eliminating the need for projections while maintaining locking capability.
Data Source
AI summary
A method of securing a precast refractory shape within a refractory structure, comprising the steps of forming a precast refractory shape by casting a refractory shape to have a plurality of spaced-apart cavities formed in an outer surface thereof; positioning the precast refractory within a refractory structure; and casting a refractory material around the precast refractory shape such that the refractory material covers the outer surface of the precast refractory and fills the cavities.