Flexible Flue Damper for Quiet, Tight Anti-Backflow Sealing
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Solution Overview
Problem
Existing flue dampers, such as steel dampers, lack tight seals, create noise, require additional components like motors and sensors, and pose safety risks due to malfunctions, especially when operating without proof of proper closure.
Innovation Solution
A high-temperature-resistant flexible damper layer is used, which assumes an open configuration during fluid flow and a closed configuration in the absence of airflow, attached to a support framework, and operates based on pressure differences without a motor or sensor, using materials like high-temperature-resistant rubber or fabric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a steel damper is used to close off the flue, then the damper can stop reverse flow of outside air, but the seal is not tight and creates undesirable noise when moving between open and closed states
Solution Approach 1:
The patent applies a flexible damper layer made of heat-resistant material that can conform to the flue pipe interior surface, creating a tight seal without rigid metallic components. This flexible membrane eliminates gap leakage while reducing noise by avoiding the clattering and friction sounds associated with rigid steel damper blades moving against each other and the flue wall.
Solution Approach 2:
The damper layer is constructed from composite materials including heat-resistant rubber, fiberglass fabric, aluminized fabric, or ceramic fiber fabric, combining the flexibility needed for tight sealing with the thermal resistance required for high-temperature flue environments. This composite structure achieves both seal tightness and noise reduction while maintaining functionality in hot conditions.
2Extent of automation
If a motor is added to operate the steel damper, then the damper can be automated, but the cost increases and additional electronic components are susceptible to malfunctions
Solution Approach 1:
The flexible damper layer operates autonomously by responding naturally to pressure differential and airflow conditions in the flue. When combustion occurs, positive pressure pushes the flexible membrane open; when combustion stops, negative pressure or gravity causes it to close. This self-actuating mechanism eliminates motors, sensors, and electronic controls, thereby maintaining high reliability without automation-related failures.
Solution Approach 2:
The patent replaces complex mechanical actuation systems (motors, linkages, springs) with a passive flexible membrane that uses fluid pressure and gravitational forces directly. This substitution of active mechanical systems with passive fluid-structure interaction simplifies the system, reduces failure points, and maintains reliable operation.
3Ease of operation
If a spring is installed instead of a motor to operate the steel damper, then the damper can operate mechanically, but heat is required to open it and the burner must be lit first
Solution Approach 1:
The flexible damper requires no external actuation mechanism like springs or motors. It automatically responds to the natural pressure differentials created during combustion operation, opening when needed and closing when not needed, without requiring the burner to be lit first or any manual intervention.
Solution Approach 2:
The damper operation is driven by changes in pressure parameters within the flue system. During combustion, positive pressure builds and pushes the flexible membrane open; when combustion ceases, pressure equalizes or becomes negative, causing the damper to close. This pressure-driven operation eliminates the need for thermal activation or mechanical springs.
4Device complexity
If existing steel dampers are used, then they can provide basic closure, but they lack tight seals and require additional proving switches and sensors
Solution Approach 1:
The flexible damper layer creates a continuous conformal seal against the flue pipe interior, eliminating gaps and ensuring complete closure without requiring multiple sensors or proving switches to verify position. The membrane's flexibility allows it to adapt to slight variations in flue geometry, maintaining reliable sealing.
Solution Approach 2:
The patent extracts and eliminates the need for separate proving switches, sensors, and electronic verification systems by using a simple flexible membrane whose closure action is self-evident through its physical configuration and response to pressure differentials. The system achieves reliable closure verification through its inherent mechanical behavior rather than additional components.
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 flexible damper provides a tighter seal, reduces noise, eliminates the need for additional components, and ensures reliable operation without motor-related malfunctions, ensuring safe and efficient gas flow management.
Implementation Method 1
configured to assume an open configuration in a presence of fluid flow (e.g., gas flow and/or airflow) from the flue pipe and a closed configuration in an absence of the airflow from the flue pipe
Data Source
AI summary
A vent damper for a fireplace system includes a support framework couplable with a flue pipe, and a flexible damper layer disposed on the support framework. The flexible damper layer assumes an open configuration in a presence of fluid flow from the flue pipe and a closed configuration in an absence of the airflow from the flue pipe. The damper layer is high temperature resistant.