Relief Damper Blade Stabilization Using Gravity-Based Counterweight
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Solution Overview
Problem
Existing overpressure discharge dampers face challenges in maintaining a stable pressure differential and achieving a sufficient opening angle due to unbalanced forces and rapid pressure changes, leading to difficulties in discharging excessive air supply and maintaining appropriate pressure levels in smoke control systems.
Innovation Solution
A blade stabilization apparatus with a damper blade designed to maintain its center of gravity above the rotating shaft's centerline, featuring a balanced damper blade structure with a long first blade and a short second blade, where a weight is added to the second blade to ensure rotational equilibrium, allowing the blade to open and close stably at any angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the damper blade is designed with a conventional center of gravity position (below the rotating shaft centerline), then the structure is simpler, but the opening angle is insufficient and pressure differential cannot be maintained stably
Solution Approach 1:
The patent applies the counterweight principle by positioning the center of gravity above the rotating shaft centerline, creating a gravitational moment that counteracts the pressure force. This gravitational counterbalance enables stable maintenance of the pressure differential and sufficient opening angle by preventing the blade from closing completely under pressure.
Solution Approach 2:
The patent changes the positional dimension of the center of gravity from below to above the rotating shaft centerline. This dimensional change in the vertical position creates a stabilizing gravitational moment that resolves the contradiction between reliability and structural simplicity.
2Productivity
If the opening angle is increased to discharge more air, then the air discharge capacity improves, but the pressure differential becomes unstable and the blade cannot maintain proper opening
Solution Approach 1:
The gravitational counterweight effect enables the blade to maintain a large opening angle while stabilizing the pressure differential. The center of gravity positioned above the rotating shaft creates a restoring moment that prevents over-opening and maintains stable operation at the desired opening angle.
Solution Approach 2:
The patent changes the critical parameter of center of gravity position from below to above the rotating shaft centerline. This parameter change fundamentally alters the force balance, enabling both large opening angles for high productivity and stable pressure differential maintenance.
3Ease of operation
If a spring is used to generate restoring force, then the blade can return to closed position, but the restoring force increases with opening angle causing excessive primary side pressure
Solution Approach 1:
The patent replaces the spring-based mechanical restoring force system with a gravity-based restoring force system. By positioning the center of gravity above the rotating shaft, the gravitational force provides a constant restoring moment that does not increase with opening angle, thereby avoiding excessive primary side pressure while maintaining blade return capability.
Solution Approach 2:
The patent changes the mechanism type from elastic (spring) to gravitational (weight). This parameter change in the restoring force mechanism eliminates the exponential increase in force with opening angle that characterizes spring systems, thereby reducing primary side pressure while maintaining operational ease.
4Extent of automation
If the center of gravity is positioned below the rotating shaft centerline, then the blade closes automatically, but the opening angle is limited and pressure control is difficult
Solution Approach 1:
The patent inverts the conventional center of gravity position from below to above the rotating shaft centerline. This inversion changes the automatic closing tendency into a controlled opening tendency, where the blade opens under pressure and closes automatically when pressure equalizes, thereby improving both automation and pressure control ease.
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 design stabilizes the degree of opening and maintains a larger opening angle compared to conventional dampers, with a stable pressure differential variation range, effectively addressing the issues of force imbalance and pressure control.
Implementation Method 1
the damper blade opens or closes by itself while rotating about the rotating shaft according to a pressure difference acting on the damper blade
Implementation Method 2
a weight is added to the second blade to ensure rotational equilibrium
Data Source
AI summary
Provided is a blade stabilization apparatus for a relief damper, and more specifically, to a blade stabilization apparatus for a relief damper which can stably maintain an opening angle of a damper blade at any angle when the damper opens or closes after the center of gravity is always aligned with a centerline of a rotating shaft in a perpendicular direction to the damper blade.