Fire Vent Structure with Thermal-Coupled Intumescent Blocking
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Solution Overview
Problem
Conventional air vents fail to effectively prevent the ingress of flames, superheated air, and burning debris from external fires into buildings, as intumescent materials in existing designs are directly exposed and require time to expand, allowing undesirable entry before full expansion.
Innovation Solution
A vent structure with a guiding member that deflects airflow in a non-linear passage, thermally coupling with a blocking member containing intumescent material to expand and block flames and debris before they reach the interior, using intumescent tape or blocks, and optionally multiple blocking members for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intumescent material is directly exposed to flames or superheated air in conventional vent designs, then the material can expand to block fire entry, but the expansion time delay allows flames and superheated air to bypass the material before it fully expands
Solution Approach 1:
The patent applies preliminary action by thermally coupling the intumescent material to the guiding member, which is positioned upstream in the airflow path. This allows the intumescent material to begin heating and expanding in advance through thermal conduction from the guiding member before direct exposure to flames occurs, reducing the critical response time delay
Solution Approach 2:
The patent uses the guiding member as an intermediary element that transfers thermal energy from the incoming airflow to the intumescent material. This intermediary thermal coupling mechanism ensures faster and more reliable heat transfer to initiate expansion before flames reach the blocking position
2Reliability
If a non-linear passage with guiding member is added to thermally couple with the blocking member, then the intumescent material expands faster before flame exposure, but the device complexity increases
Solution Approach 1:
The guiding member serves multiple functions: it directs airflow through the vent passage and simultaneously acts as a thermal coupling element to heat the intumescent material. This multi-functionality reduces the need for separate heating components, thereby limiting the increase in device complexity
Solution Approach 2:
The patent merges the airflow guidance function and the thermal transfer function into a single integrated guiding member structure. By combining these functions, the design avoids adding separate complex heating mechanisms while achieving faster intumescent material response
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
Effectively prevents the entry of heated air, flames, and burning debris into buildings by ensuring the intumescent material expands before exposure, providing enhanced fire protection with a design that can be retrofitted into existing structures.
Implementation Method 1
Heat from the flow of material is received by the guiding member and transferred to the blocking member
Implementation Method 2
A blocking member having an intumescent material is disposed on a surface of the guiding member that faces the outlet side. The blocking member has a non-expanded state that allows flow of material and an expanded state that at least partially blocks the flow of material
Data Source
AI summary
A vent apparatus that prevents the ingress of flames, superheated air, and/or flaming materials (e.g., embers) from an external fire to a building or structure is disclosed. The vent apparatus comprises a frame that defines an inlet, and outlet, and an internal passage. A guiding member is disposed within the internal passage to thereby deflect or direct a portion of a flow of material between the inlet and outlet. A blocking element is disposed on the guiding member that is configured to expand to at least partially block the flow of material between the inlet and outlet.