Intumescent Fire Stop for Light Fixture Heat Dissipation
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Solution Overview
Problem
Recessed lighting fixtures in buildings often facilitate the spread of fires due to their construction from heat-conductive materials and inadequate sealing, allowing flames and smoke to pass through the openings in ceilings and walls.
Innovation Solution
A lightweight fire stop enclosure with a layer of intumescent material is positioned around the light fixture, which expands and forms a low thermal conductivity char when activated by heat, effectively blocking flames and smoke from passing through the ceiling or wall openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heavy thermally insulating material box is used to prevent fire spread, then fire resistance is improved, but weight and installation stress increase
Solution Approach 1:
The patent changes the physical state of the fire stop material from a pre-formed heavy box to a lightweight expandable foam that undergoes phase change from liquid/gel to solid char. This parameter change allows the material to achieve fire resistance through expansion rather than inherent density, resolving the contradiction between fire resistance and weight.
Solution Approach 2:
The fire stop comprises a composite structure with a lightweight enclosure and intumescent material layer. The intumescent material creates a composite char structure when activated, combining the enclosure framework with the expanded intumescent char to achieve fire resistance without requiring heavy traditional insulating materials.
2Reliability
If traditional heavy fire stop materials are used, then fire blocking capability is improved, but ease of installation deteriorates
Solution Approach 1:
The fire stop material transitions from a heavy, difficult-to-install box structure to a lightweight expandable foam that can be easily positioned and then automatically expands to fill the required space. This parameter change in material state and weight makes installation significantly easier while maintaining fire blocking capability.
Solution Approach 2:
The expandable foam fire stop performs part of its own installation function by automatically expanding to fill the enclosure space and conform to the required geometry. This self-expanding characteristic eliminates the need for complex installation procedures to achieve proper fit and sealing, improving ease of installation.
3Ease of operation
If the fire stop enclosure is made lightweight, then ease of installation is improved, but structural strength may worsen
Solution Approach 1:
The enclosure combines a lightweight structural framework with an intumescent material layer that creates a composite char structure when activated. This composite approach allows the base structure to remain lightweight for easy installation while the intumescent char provides the necessary structural integrity and fire resistance during combustion.
Solution Approach 2:
The fire stop material undergoes a parameter change from a lightweight liquid/gel state during installation to a solid char state during fire conditions. This phase change allows the material to maintain structural strength when needed while remaining lightweight during installation, resolving the contradiction between these two requirements.
4Reliability
If the enclosure completely surrounds the light fixture, then fire sealing is improved, but heat dissipation from the fixture deteriorates
Solution Approach 1:
The fire stop provides localized fire sealing around the light fixture perimeter rather than creating a complete sealed enclosure. The intumescent material is positioned to seal the gaps between the fixture and enclosure at critical fire propagation paths, while maintaining local thermal zones that allow heat dissipation from the fixture.
Solution Approach 2:
The intumescent material undergoes a parameter change in thermal conductivity when activated, transforming from a material that allows heat passage during normal operation to a low thermal conductivity char that provides thermal insulation during fire conditions. This dynamic parameter change allows the system to maintain both heat dissipation during normal use and fire sealing during combustion.
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 fire stop effectively impedes the spread of flames and smoke by filling the space around the light fixture, providing a thermal and flame barrier while allowing heat from the fixture to escape, thus preventing fire propagation and reducing installation stress with its lightweight design.
Implementation Method 1
When the intumescent material reaches at least a pre-determined activation temperature, usually, from a fire, it transforms into a material with a relatively low thermal conductivity that expands, substantially filling the interior space and thereby impeding or stopping flames and smoke from moving behind the wall or ceiling.
Implementation Method 2
it transforms into a material with a relatively low thermal conductivity that expands
Implementation Method 3
it transforms into a material with a relatively low thermal conductivity that expands
Data Source
AI summary
A fire stop for use with a light fixture in a suspended ceiling or wall. It prevents flames and smoke from passing through the light fixture and spreading throughout a building by moving above the ceiling or behind the walls. The fire stop has a lightweight enclosure that defines an interior space disposed above the suspended ceiling, or behind the wall. Contained within the interior space are a portion of the light fixture and a layer of intumescent material. The intumescent material forms a material with a relatively low thermal conductivity that substantially fills the interior space, impeding the movement of flames or smoke, when the intumescent material reaches at least a pre-determined activation temperature.