Perforated Sheet Metal Cover for Intumescent Heat Shield
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Solution Overview
Problem
Existing pipe couplings with intumescent coatings face issues with partial foaming from localized heat attacks and water solubility, which compromise their heat and fire protection effectiveness.
Innovation Solution
A perforated sheet metal cover with strategically designed openings is used to distribute heat and prevent partial foaming, combined with an intumescent material incorporated into a polymer matrix for enhanced mechanical and thermal protection, such as Fireblock ™, which is hydrophobic and fuel-resistant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an intumescent coating is applied to the pipe coupling for fire protection, then thermal protection is improved, but localized heat attacks cause unintended partial foaming that compromises protection effectiveness
Solution Approach 1:
The sheet metal cover is provided with openings distributed over its surface, creating different local zones: covered areas that protect against localized heat attacks and prevent unintended foaming, and openings that allow controlled foaming during severe heat exposure. This local differentiation resolves the contradiction by making the protection response dependent on the severity and distribution of the heat attack.
Solution Approach 2:
The cover is segmented into multiple openings rather than being a solid continuous structure. This segmentation allows the system to respond differently to heat attacks of varying intensity - small localized attacks are blocked by the metal between openings, while severe attacks can penetrate through multiple openings to trigger controlled large-area foaming.
2Strength
If a solid sheet metal cover is used to protect against heat, then mechanical protection is improved, but heat distribution becomes concentrated rather than dispersed
Solution Approach 1:
The sheet metal cover is designed as a perforated structure with multiple openings, creating a porous-like configuration that allows heat to pass through to the intumescent layer. This resolves the contradiction by maintaining the mechanical strength of the metal cover while enabling controlled heat transmission for triggering protective foaming when needed.
3Reliability
If intumescent material is used for fire protection, then fire resistance is improved, but water solubility causes material degradation and loss of functionality
Solution Approach 1:
The patent incorporates the intumescent material into a polymer matrix, creating a composite structure that combines the fire-resistant properties of the intumescent material with the water resistance and mechanical strength of the polymer matrix. This resolves the contradiction by maintaining fire resistance while eliminating water solubility issues.
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 prevents unintended foaming from localized heat attacks and ensures controlled, large-area foaming during severe heat exposure, while maintaining integrity against water and enhancing mechanical strength and thermal protection.
Implementation Method 1
the intumescent layer on the surface of the component is covered with a protective jacket which has openings that are distributed over its surface for the exit of the intumescent material that swells under the action of heat
Implementation Method 2
The remaining webs of the perforated plate distribute the heat from a partial area to a larger spread area, so that in the event of a partial attack with a total of low energy, the intumescent layer is prevented from foaming in this partial area
Implementation Method 3
the main component of the intumescent mass, e.g. expandable graphite, is incorporated into a polymer matrix. The combination of a perforated plate with such an intumescent compound is therefore optimal, as it solves all conceivable problems in connection with good fire protection. An example of this special intumescent material is called Fireblock TM and is manufactured by Mobil Werke AG. In addition to the ideal hydrophobic and fuel-resistant properties of this material
Data Source
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AI summary
A heat shield for temperature-sensitive components, having a cover (7) which surrounds the components and is made from intumescent material. The cover (7) is surrounded by a sheet-metal cladding (8), the circumference of which is provided with a plurality of through-openings (8a) for the intumescent material which swells under the action of heat. When the intumescent material swells, it penetrates the through-openings (8a) to the outside and forms a thermally insulating shell around the component to be protected.