Sliding Fire Door Smoke Seal Structure That Prevents Bar Unhooking
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Solution Overview
Problem
Existing hot smoke seal devices for sliding fire doors face a critical issue where the profile bars tend to unhook during a fire, allowing smoke to pass through due to deformation, which cannot be prevented by using stronger or thicker profile bars.
Innovation Solution
A hot smoke seal device featuring a hook-shaped first profile bar and an L-shaped second profile bar, with thermo-expanding gaskets at their interference points, allowing for sufficient deformation to maintain contact and prevent separation during a fire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional profile bars are used in the smoke seal device, then the structure is simple and cost-effective, but the profile bars unhook during fire due to deformation
Solution Approach 1:
The patent introduces a dynamic adjustment mechanism that allows the profile bars to adapt their position during fire. The bars can move horizontally along the guide rails and vertically along the adjustment rails, transforming from a static rigid structure to a dynamic adaptive system that maintains sealing contact despite thermal deformation
Solution Approach 2:
The patent utilizes thermal expansion parameter changes by incorporating thermo-expanding gaskets between the profile bars and door panel. These gaskets increase in volume during fire, automatically adjusting the sealing pressure and maintaining contact between the profile bars and the door edge, thereby preventing smoke infiltration
2Reliability
If stronger or thicker profile bars are used, then the seal reliability improves, but the cost and complexity increase
Solution Approach 1:
The patent employs thermo-expanding gaskets that change their physical parameters (volume, density) in response to temperature. During fire, these gaskets expand automatically, increasing sealing pressure without requiring stronger profile bars. This parameter-based adaptation maintains seal reliability while using conventional, cost-effective materials
Solution Approach 2:
The patent introduces adjustment mechanisms as intermediary elements between the profile bars and the door panel. These intermediaries (adjustment rails, locking mechanisms) enable the profile bars to maintain optimal sealing position and contact pressure without requiring the bars themselves to be stronger or thicker
3Stability of the object's composition
If the profile bars are fixed rigidly, then the structure is stable, but the bars cannot adapt to thermal deformation and unhook
Solution Approach 1:
The patent transforms the rigid fixed structure into a dynamic adjustable system. The profile bars are mounted on adjustment rails that allow vertical movement, and can be locked at different positions. This dynamic capability enables the structure to adapt to thermal deformation while maintaining stability through the locking mechanism
Solution Approach 2:
The patent divides the smoke seal device into separable functional modules: profile bars, adjustment rails, locking mechanisms, and thermo-expanding gaskets. This segmentation allows each component to perform its specific function independently - the bars provide structural support, the rails enable adjustment, the locks maintain position, and the gaskets provide thermal adaptation
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 that the profile bars do not unhook, effectively preventing smoke from passing through, even with conventional steel and without increasing the thickness or strength of the materials used.
Implementation Method 1
thermo-expanding gaskets which, in the case of fire, increase in volume to prevent the hot smoke from passing beyond the door
Implementation Method 2
because of the expansion of the materials forming the door, the upper edge of the panel 10.2, or at least a part thereof, tends to gradually move towards the right
Data Source
Figure 1~4
Figure 5
AI summary
The hot smoke seal device for sliding fire doors provided in a building (22), comprising at least two metal profile bars (16.3, 18.2), of which a first profile bar (16.3) is directly or indirectly fixed to the building (22) in which the door is provided, while the second profile bar (18.2) is fixed to the upper edge of the door panel (10.2). The two profile bars (16.3, 18.2) have parts intended to mutually interfere in the case of fire, thermo-expanding gaskets (36) being provided in correspondence with these parts. The cross-section through at least one (16.3) of the two profile bars (16.3, 18.2) is deformable in order to maintain mutual interference notwithstanding the horizontal withdrawal of the upper edge of the door panel (10.2) in the case of fire.