Fire Damper Seal With Intumescent Core and Deformable Sleeve
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Solution Overview
Problem
Existing fire and smoke dampers face challenges in maintaining an effective seal during high temperatures, as the peripheral seals can leak due to the degradation of materials used, compromising the integrity of the fire barrier and the prevention of fire spread through ducts.
Innovation Solution
A fire and smoke damper with a blade featuring a core of intumescent material and a deformable sleeve with an air gap, where the sleeve provides initial sealing at low temperatures and the intumescent material expands to maintain the seal during a fire, while the glass fibre scrim coating retains the intumescent material and prevents direct contact with flames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a peripheral seal is used to prevent fire spread through the duct, then fire barrier integrity is improved, but the seal may leak at high temperatures due to material degradation
Solution Approach 1:
The seal uses intumescent material that undergoes a parameter change at high temperatures by expanding volumetrically. This expansion occurs when the material is exposed to fire conditions, causing it to increase in volume and maintain sealing pressure despite thermal degradation of other components.
Solution Approach 2:
The seal comprises a composite structure with an intumescent core surrounded by a deformable sleeve. This composite design combines materials with different thermal responses: the intumescent core expands to maintain sealing force while the deformable sleeve accommodates the expansion and provides initial sealing at lower temperatures.
2Reliability
If a rigid seal structure is used to maintain sealing force, then sealing effectiveness is improved, but the seal cannot accommodate thermal expansion and deformation at high temperatures
Solution Approach 1:
The seal transitions from a static rigid structure to a dynamic system that adapts to thermal conditions. The deformable sleeve and intumescent core work together to allow the seal to change its physical state and dimensions in response to temperature variations, maintaining sealing effectiveness throughout the temperature range.
Solution Approach 2:
The design deliberately incorporates thermal expansion as a functional mechanism. The intumescent material is selected to expand when exposed to fire temperatures, and the deformable sleeve is designed to accommodate this expansion while maintaining contact with the duct surface to prevent fire spread.
3Ease of manufacture
If a single-material seal is used to simplify construction, then manufacturing complexity is reduced, but the seal cannot provide both low-temperature flexibility and high-temperature expansion
Solution Approach 1:
The seal uses a composite structure with an intumescent core surrounded by a deformable sleeve. This composite design combines materials with different thermal responses: the intumescent core expands to maintain sealing force while the deformable sleeve accommodates the expansion and provides initial sealing at lower temperatures.
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 ensures a reliable seal across varying temperatures, maintaining the integrity of the fire barrier and preventing fire spread by accommodating the expansion of the intumescent material and maintaining sealing functionality even when the sleeve's coating degrades.
Implementation Method 1
the seal comprising a core of intumescent material and a deformable sleeve surrounding said core characterised in that there is provided an air gap between the sleeve and the core
Implementation Method 2
The sleeve provides a seal at relatively low temperatures but in the event of a fire the sleeve may develop leaks
Data Source
Figure 1~3
AI summary
A fire and/or smoke damper for a duct comprises a blade pivotally disposed in a frame for movement between an open position and a closed position in said duct. The blade has a peripheral channel that supports a seal for sealing engagement with the inner surface of the frame. The seal comprises a core of intumescent material and a deformable sleeve surrounding said core with an air gap. The sleeve provides sealing at low temperatures. In the event of a fire the intumescent material expands at high temperatures to maintain the seal but is retained in position by the sleeve.