Fire Damper Housing Insulation for Close-Wall Ignition Risk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fire dampers face a risk of material ignition due to excessive heating when a fire is close to the proximal end of the housing, particularly in configurations where the distance between the fire valve and the opposing wall is small, as the heat transfer is not adequately managed by conventional means.
Innovation Solution
An insulation layer made of fibrous materials, such as cellulose fibers or cardboard, is applied to the housing surrounding the fire valve, extending towards the proximal end, with a sodium metasilicate based adhesive to create air pockets and increase the ignition temperature, thereby reducing heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the fire valve is positioned close to the wall surface to reduce installation space, then the device complexity is reduced, but the housing temperature increases to dangerous levels causing material ignition risk
Solution Approach 1:
An insulation layer made of heat-resistant material is introduced as an intermediary between the housing and the wall surface. This insulation layer acts as a thermal barrier that prevents direct heat transfer to the housing, allowing the fire valve to be positioned close to the wall while maintaining safe housing temperatures.
Solution Approach 2:
The housing assembly is transformed into a composite structure by adding the insulation layer to the housing. This composite construction combines the structural function of the housing with the thermal protection function of the insulation layer, enabling close wall mounting without excessive heating.
2Loss of energy
If punching is applied to the housing to limit heat transfer, then the heat transfer through the housing is reduced, but this solution becomes ineffective when the fire valve is positioned close to the wall where there is no space for punching
Solution Approach 1:
The insulation layer serves as an external intermediary that provides thermal protection without requiring modifications to the housing structure. Unlike punching which requires space within the housing wall, the insulation layer can be applied to the outer surface of the housing, making it effective for all mounting configurations including close-wall installations.
3Loss of energy
If the insulation layer is made from dense material to improve thermal protection, then the heat transfer is better blocked, but the weight of the fire damper increases
Solution Approach 1:
The insulation layer is made from a porous or fibrous heat-resistant material that provides effective thermal insulation through its structure. The porosity and air pockets within the material create thermal resistance without requiring high density, thereby maintaining lightweight construction while blocking heat transfer.
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 insulation layer effectively mitigates the risk of ignition by dissipating heat and maintaining the housing at a safer temperature, even in close proximity to a fire, enhancing the fire damper's safety and performance.
Implementation Method 1
an insulation layer is provided surrounding the housing in proximity of the valve and extending a distance towards the proximal end of the housing
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A fire damper comprising a housing defining a channel having a proximal end and a distal end, a fire valve mounted in said housing configured to close-off the channel when in a closed position, characterized in that an insulation layer is provided surrounding the housing in proximity of the valve and extending a distance towards the proximal end of the housing.