Multi-Layer Pipe Shell for Chimney Insulation
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Solution Overview
Problem
Existing insulating pipe shells for chimneys face challenges in achieving good thermal conductivity and mechanical strength, particularly in axial strength, while also requiring high process engineering effort and having non-uniform insulating properties due to unfavorable fiber orientation.
Innovation Solution
A multi-layer pipe shell structure comprising a wound outer layer with laminar fiber flow and a cut inner layer, where the inner layer is inserted into the outer layer without additional binders, providing a stable and cost-effective solution with enhanced thermal conductivity and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a wound pipe shell body is used, then thermal conductivity is improved due to laminar fiber flow, but mechanical strength particularly axial strength deteriorates
Solution Approach 1:
The patent combines two different pipe shell body types (wound and cut) into a composite structure. The wound pipe shell body provides superior thermal conductivity through laminar fiber flow, while the cut pipe shell body contributes enhanced mechanical strength and axial load-bearing capacity. This composite approach allows both thermal and mechanical requirements to be satisfied simultaneously.
Solution Approach 2:
The patent applies different structural qualities to different regions of the insulation system. The wound pipe shell body is positioned to optimize thermal insulation performance, while the cut pipe shell body is positioned to provide structural support and axial strength. Each component is optimized for its specific function rather than attempting to make a single component fulfill all requirements.
2Strength
If additional binders are used to join pipe shell bodies, then mechanical strength is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent employs a self-service joining mechanism where the cut pipe shell body is inserted into the wound pipe shell body, creating a friction-based mechanical interlock. The tight fit between the two components provides sufficient connection strength without requiring additional binders, adhesives, or fastening elements. This self-joining approach simplifies the manufacturing process and reduces complexity.
Solution Approach 2:
The patent extracts the joining function from the system by eliminating the need for separate binding agents or fastening mechanisms. The structural design itself provides the joining capability through the interference fit between the inner cut pipe shell body and the outer wound pipe shell body, removing the need for additional joining materials.
3Ease of manufacture
If conventional pipe shell structures are used, then manufacturing is simpler, but insulating properties are non-uniform due to unfavorable fiber orientation
Solution Approach 1:
The patent uses a composite structure where the wound pipe shell body provides uniform laminar fiber flow for consistent thermal insulation, while the cut pipe shell body complements this with its own structural properties. This combination ensures uniform insulating properties throughout the insulation system.
Solution Approach 2:
The patent optimizes fiber orientation locally in the wound pipe shell body to achieve laminar flow patterns that ensure uniform thermal conductivity across the insulation layer. This localized optimization of fiber arrangement directly improves the uniformity of insulating properties.
Data Source
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AI summary
An insulating element for the thermal and/or sound insulation of pipes, in particular chimney pipes, in the form of a pipe shell made of hardened mineral wool is multi-layered, in particular two-layered, wherein the outer layer body is formed from a wound shell and the inner layer body from a cut pipe shell body.