Fire Damper Blade Composite Insulation and Intumescent Sealing
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Solution Overview
Problem
Conventional fire damper assemblies face challenges in maintaining effective sealing and thermal barrier performance at high temperatures, where conventional seals degrade and parts expand differently, leading to gaps between blades and duct walls, compromising fluid and heat containment.
Innovation Solution
The fire damper assembly incorporates a sheet metal inner part with thermally insulating material covering over 90% of its faces, combined with a sealing strip and intumescent materials to enhance sealing, where the intumescent expands to maintain the seal as conventional materials degrade at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional seals are used in fire damper assemblies, then sealing is effective at normal temperatures, but the seals degrade or are destroyed at high temperatures
Solution Approach 1:
The patent employs intumescent materials that undergo a parameter change at high temperatures - specifically, they expand volumetrically when exposed to heat. This expansion transforms the sealing mechanism from a static conventional seal to a dynamic thermal-responsive seal that actively closes gaps that form during thermal expansion of duct components.
Solution Approach 2:
The fire damper assembly uses composite construction combining conventional sealing materials for normal temperature operation with intumescent materials for high temperature protection. This layered composite approach allows the assembly to maintain sealing effectiveness across the full temperature range by leveraging the strengths of different material types.
2Temperature
If parts of the assembly are made of different materials to achieve thermal insulation, then thermal barrier performance is improved, but gaps form between blades and duct walls due to differential expansion at high temperatures
Solution Approach 1:
The patent acknowledges and utilizes thermal expansion as an inevitable phenomenon at high temperatures. By incorporating intumescent sealing materials that expand in response to heat, the design compensates for the gaps created by differential expansion of metal components, ensuring that the sealing integrity is maintained despite the thermal movement of various materials.
3Temperature
If blades are made of thermally insulating material to provide thermal break, then heat transmission is reduced, but structural strength and sealing capability are compromised
Solution Approach 1:
The blade assembly uses composite construction with thermally insulating material providing the thermal break function while separate metal components provide the necessary structural strength. This composite approach allows each material to perform its primary function - insulation for thermal protection and metal for mechanical strength - without compromising either requirement.
Solution Approach 2:
The blade is segmented into functional zones: thermally insulating material for heat resistance and separate metal structural elements for strength and sealing. This segmentation allows the design to optimize each component for its specific function while working together as an integrated assembly.
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
This configuration provides a robust thermal barrier and maintains effective sealing even at high temperatures by using thermally insulating materials and intumescents, ensuring no transmission of heat or fluid through the assembly.
Implementation Method 1
thermally insulating material covering each of the opposite faces of the sheet metal part... The insulating material may reduce both conduction and radiation of heat
Implementation Method 2
a sealing strip and intumescent materials to enhance sealing, where the intumescent expands to maintain the seal as conventional materials degrade at high temperatures
Data Source
Figure 1
Figure 2~3
Figure 4~5A
AI summary
A fire damper assembly comprises a mounting frame (1) defining an opening and at least one blade (2) disposed in the opening and mounted on the mounting frame for rotation about an axis between an open position in which flow channels through the opening are defined between said at least one blade and the frame, and a closed position in which the flow channels are closed. Said at least one blade (2) is of composite construction comprising a sheet metal inner part (10) and a thermally insulating material (11A, 11B) covering each of the opposite faces of the sheet metal part (10).